5 PROPOSED ADMINISTRATIVE RULES

 

 

 

DE PARTMEN T OF CONSU MER AND INDUS TRY SER VIC ES DIRECTO R’S OFF ICE

OCC U PATIO NAL HEALT H STAND ARDS --AI R CONTAMI NANTS

 

Filed with th e Secretar y of Stat e on

These ru les tak e effect 15 days after fili ng with th e Secretar y of Stat e

 

(By auth ority conferr ed on th e director of th e dep artm ent of con sum er an d industr y services by sections 14 an d 24 of 1974 PA 154 , MCL 408 .1014 an d 408 .1024 an d Execut ive Reorgan izat ion  Order  Nos.  1996 -1  an d  1996 -2,  MCL   330 .3101   an d 445 .2001 )

 

R 325 .51102 , R 325 .51103 , R 325 .51104 , R 325 .51105 , an d R 325 .51108 ar e am ended

an d R 325 .51106 is rescinded of th e Michigan Administrat ive Code as follows:

 

R 325 .51102   De finitio ns.

Rule 2.  As used in th ese ru les:

(a) "Ceili ng" mean s th e employee' s exposur e which sha ll not be exceeded dur ing an y part of th e work day. If instantan eous monitoring is not feasible, THEN th e ceiling sha ll be assessed as a 15-minut e, time-weig ht ed avera ge exposur e which sha ll not be exceeded DUR ING at an y PART OF THE ti me ove r a working day.

(b) “SKIN DES IGNATIO N” MEANS THOSE SUBS TANCES SO IND ICAT ED THAT HAVE TOXIC EFFE CTS DUE TO ABS ORPTIO N THROUGH AN EMPLOYEE’S SKIN.

(b) " P e rm i ss ible exp os ur e li m i t ( PE L)" m e an s th e ma xi mum co n ce ntrat io n t o w h ic h an e m p loyee ma y be exp osed a ve ra ge d ove r an 8- h o ur pe r iod.

(c)         "Short-term exposur e limit (STEL)" mean s th e employee' s 15-minut e,  time- weig ht ed avera ge exposur e which sha ll not be exceeded at an y time dur ing a workday, un less anoth er time limit is specified in a par enth etical notat ion below th e limit. Such exposu r es sha ll no t occu r mo r e t han 4 ti mes du ri ng a w o r kday and t he r e sha ll b e  no t l ess  t han  60 m i nu t es b e t w een  successive  exposu r es at t he S T E L. If anoth er time period is specified, THEN th e time-weig ht ed avera ge exposur e over that  time limit sha ll not be exceeded at an y time dur ing th e work day.

(d)            "Time-weig ht ed avera ge (TWA)" mean s th e employee' s avera ge  airborn e exposur e in an y 8-hour workshift of a 40-hour workwee k which sha ll not be exceeded .

(e)      The term s "substan ce" AND "air contam inant " and " ma t e ri a l" ar e equivalent in mean ing for pur poses of th ese ru les.

 

 

 

R 325 .51103   Expos ure li mits .

Rule 3. An EMP LOYER SH ALL ENSURE THAT AN employee 's exposur e to an y substan ce listed in ta bles G-1-A OR G-2, o r G-3 o f t hese  r u l es IN R 325 .51108 IS sha ll b e limited in a ccor dan ce with th e requirement s of ALL OF th e followin g provisions:

(a) With respe ct to ta ble G-1-A, all of th e followin g provisions apply:

(i)    An e m p loyee' s exp os ur e t o an y s u bs tan ce in ta ble G -1 -A un de r th e tran s it iona l lim it s column s , th e exp os ur e lim it of w h ich is p r e ceded by a C , s ha ll at n o t im e exceed th e exp os ur e lim it give n for that  s u bs tan ce in  ta ble G -1 -A un de r  th e tran s it iona l lim it s column s .  REMOVED (DATE).

(ii)    An e m p loyee' s exp os ur e t o an y s u bs tan ce in ta ble G -1 -A un de r th e tran s it iona l lim it s column s , th e exp os ur e lim it of w h ich is n ot p r e ceded by a C , s ha ll n ot exceed th e 8 -h our , t im e -weig ht ed a ve ra ge give n for that s u bs tan ce in ta ble G -1 -A un de r th e tran s it iona l lim it s column s in an y 8-h our work s h ift of a 40 -h our work wee k .

(iii)     An employee' s exposur e to an y substan ce listed in ta ble G-1-A sha ll not exceed th e t ime-weight ed avera ge (TWA) LIMIT , short -term exposur e limit (STEL), an d ceiling limit specified for that substan ce in ta ble G-1-A unde r t he f i na l r u l e li m its co l umns .

(iv)    To prevent or reduce sk in absorption, an employee' s sk in exposur e to substan ces listed in ta ble G-1-A with an “X” in one o r bot h o f th e sk in des ignat ion column s followin g th e substan ce nam e sha ll be prevent ed or reduced to th e extent necess ar y  unde r t he ci r cumstanc e sthr ough th e use of gloves, covera lls, goggles, or oth er appropriat e persona l protective equipment , engineering contr ols, or work pra ct ices.

(v)   AN EMP LOYEE SH ALL NOT BE EXP OSED TO AIR CONCEN TRATIO NS BE TWEEN THE TWA AND STEL LIMIT S MORE THAN 4 TIMES IN A WORKSH IFT AND SU CH EXP OSURES SH ALL BE NO  LESS  THAN  60 MINU TES AP ART.

(b) With respe ct to ta ble G-2, all of th e followin g provisions apply:

(i ) T ab l e G -2 is app li ca bl e f o r t he tra ns itio na l pe ri od and  to t he ex t en t set  f o rt h i n R 325 .51106 .

(i) (ii ) An employee' s exposur e to an y SUBS TANCE ma t e ri a l listed in ta ble G-2 in an y 8-hour work shift of a 40-hour work week sha ll not exceed th e  8-hour ,  t ime- weight ed avera ge limit given for that  SUBS TANCE ma t e ri a l in ta ble G-2.

(ii ) (iii ) An employee' s exposur e to a SUBS TANCE ma t e ri a l listed  in  ta ble  G-2 sha ll not exceed , at an y t ime dur ing an 8-hour WORKshift, th e a ccep ta ble ceiling concentrat ion limit given for th e SUBS TANCE ma t e ri a l in th e ta ble, except for a period of t ime an d up to a con centrat ion that does not exceed th e ma ximum durat ion an d con centrat ion a llowed in  th e column  un der "Accep ta ble ma ximum  peak  above th e ceiling concentrat ion for an 8-hour WORKshift." For exam ple, dur ing an 8-hour work shift, an employee ma y be exposed to a con centrat ion of substan ce A (with a 10 part s of THE SUBS TANCE per million part s of air (ppm) TWA, 25 ppm ceiling an d 50 ppm peak ) above 25 ppm (but not above 50 ppm) only for a ma ximum period of 10 minut es.  Such AN exposur e sha ll be com pensat ed for by exposur es to con centrat ions

 

 

less than 10 ppm so t ha t th e cumu lat ive exposur e for th e ent ire 8-hour work shift does not exceed a TIME-weight ed avera ge of 10 ppm.

(iii ) (iv ) If a substan ce is preceded by AN “S”, THEN an employer sha ll tak e th e necess ar y precaut ions to prevent AN EMP LOYEE a pe r son from absorbing THE SUBS TANCE a contamin   a n tthr ough his or her sk in.

(c)T a ble G -3 is a pp lica ble for th e tran s it iona l pe r iod an d t o th e ext e nt se t forth in R 325 .51106 .   An e m p loyee' s exp os ur e t o an y s u bs tan ce lis t ed in ta ble G -3 in an y 8 - h our work s h ift of a 40 -h our  work wee k s ha ll n ot exceed th e 8-h our , t im e-weig ht ed a ve ra ge lim it give n for that s u bs tan ce in th e ta ble .

 

R 325 .51104   Computation   formu lae .

Rule 4. The com putat ion formu las THAT w h ic h sha ll apply  to  employee exposur e to ONE OR more t han 1 substan ceS THAT HAVE  AN  f o r  w h ic h  8- hour , t ime-weight ed avera ges a r e listed in ta ble G-1-A OR G-2, o r G-3 i n o r de r to determ ine wheth er an employee is exposed  IN  EXCESS  OF  THE  EXP OSURE ove r t he r egu l ato r y limit ARE is as follows :

(a)        AN EMP LOYER SH ALL COMP UTE th e cumu lat ive  exposur e  FOR MULTIP LE EXP OSURES TO A SINGLE SUBS TANCE for an 8-hour work shift  sha ll b e computed   as follows :

E = (C1 T1   + C2 T2  + ... CnTn) â 8 HOURS          E = (Ca Ta  + CbTb  + ... CnTn) â 8

Where:         E          is th e  e q u ival en t  CUMULATIV E exposur e for  t he  w o r king shi f t AN 8-HOUR WORKSH IFT.

C1          is th e SUBS TANCE  concentrat ion dur ing THE  FIRS T  any  period of t ime

“T” where th e con centrat ion rema ins con stant .

C2                IS  THE   SUBS TANCE   CONCEN TRATIO N   DUR ING   THE   SE COND P ER IOD  OF  TIME  “T”  WHERE  THE   CONCEN TRATIO N   RE MAINS CONS TANT.

T          is   th e   P ER IOD   OF    TIME   du r ation   in    hour s   FOR    WHICH    THE SUBS TANCE o f t he exposu r e at t he concentrat ion C RE MAINS CONS TANT . The value of E  sha ll not  exceed  th e 8-hour , t ime-weight ed  avera ge  LIMIT  FOR THE SUBS TANCE AS  specified in ta ble G-1-A OR G-2, or G-3 f o r t he  ma t e ri a l i nvo l ved .

To illustrat e th e formu la FOR A CUMULATIV E EXP OSURE TO A SINGLE SUBS TANCE p r esc rib ed i n t h is subdivisi   o n, assum e that  substan ce A ha s an 8- hour , t ime-weight ed avera ge EXP OSURE limit of 100 ppm noted in ta ble G-1-A. Assum e that an employee is subject to th e followin g EXP OSURES OVER AN 8- HOUR WORKSH IFT: exposu r e :

Two hour s' exposur e at 150 ppm Two hour s' exposur e at 75 ppm Four hour s' exposur e at 50 ppm

Substitut ing th is in format ion in TO th e formu la :

E = [(150 PP M X 2 HRS ) + (75 PP M X 2 HRS ) + (50 PP M X 4 HRS )] / 8 HRS E = [300 PP M·HRS + 150 PP M·HRS + 200 PP M·HRS ] / 8 HRS

E = 650 PP M·HRS  / 8 HRS  = 81 .25 PP M

 

 

(2 x 150 + 2 x 75 + 4 x 50) â 8 = 81 .25 ppm

Since  THE    CUMULATIV E  EXP OSURE   OF    81.25   ppm   is   less     than   THE EXP OSURE           LIMIT    OF      100     ppm,    THEN    th e     EMP LOYEE ’S    8-hour

WORKSH IFT, ti me -w e ig h t ed ave r age li m it , t he exposur e is a ccep ta ble.

(b)      Fo r a m ixt u r e o f ai r contamina n t,s An employer  sha ll  com put e  th e equivalent exposur e FOR A MIXTURE OF AIR CONTAMINANTS FOR AN 8- HOUR WORKSH IFT as follows :

E m  = (C 1  â L 1 + C 2  â L 2) + ... (Cn  â Ln)

Where:         E m               is   th e   equivalent   exposur e   TO   f o r   th e   mixtur e    OF     AIR CONTAMINANTS DUR ING AN 8-HOUR WORKSH IFT.

C1          is th e AVER AGE 8-HOUR  con centrat ion of THE  FIRS T SUBS TANCE.  a pa rti cu l a r contamin            a n.t

C2                IS   THE   AVER AGE  8-HOUR   CONCEN TRATIO N   OF   THE   SE COND SUBS TANCE.

L         is  th e  8-HOUR ,  TWA  exposur e  limit  for  that   P ARTICULAR   substan ce

speci f i ed .

The value of E m  sha ll not exceed A VALUE OF ONE (1 .0). un ity (1) .

To   illustrat e   th e   formu la     FOR   A    MIXTURE  OF    AIR     CONTAMINANTS, ASSU ME p r esc rib ed i n t h is subdivision  , conside r th e followin g exposur es:

 

SUBS TANCES MIXTURE Mate ri a l	IN	AVER AGE           Actua l con centrat ion of 8-hour     exposur e      (C) (ppm )	8-hour TWA EXP OSURE (L) P E L (ppm )	LIMIT
Substan ce A B		500 PP M	1,000 PP M
Substan ce B C		45 PP M	200 PP M
Substan ce D		40 PP M	200 PP M

 

Substitut ing THIS INF ORMATIO N in TO th e formu la :

EM  = (500 PP M / 1,000 PP M) + (45 PP M / 200 PP M) + (40 PP M / 200 PP M)

E m  = 0.500 + 0.225 + 0.200

E m  = 0.925

Since THE  VALUE  OF  E m   DID  NOT EXCEED  ONE  (1 .0),  is  l ess  t han  un ity (1) , th e EMP LOYEE ’S 8-HOUR WORKSH IFT exposur e TO THE MIXTURE OF

AIR CONTAMINANTS com bi na tio n is w it h i n a ccep ta ble. li m its .

R 325 .51105  Meth ods of com plian ce.

Rule 5. To achieve complian ce with th e provisions of R 325 .51103 an d R 325 .51104 , administrat ive or engineering contr ols sha ll fir st be determ ined an d implement ed when feasible. When IF such contr ols ar e not feasible to achieve full com plian ce, THEN P ERS ONAL protective equipment or an y oth er protective measur es sha ll be used to keep th e EMP LOYEE ’S exposur e o f emp l oyees to air contam inant s with in th e EXP OSURE limits prescribed in th ese ru les. Any equipment an d techn ical measur es  used  for  th is  pur pose  sha ll  be  approved  for  each  part icular  use  by  a

 

 

com petent industr ia l hygienist or oth er  techn ically  qua lified  person.  When  A respi rat or s IS a r e used, ITS t he ir use sha ll com ply with th e provisions of O.H . ru le 3502 :

R 325 .60051  ET SE Q. respi rat ory protection , P ART 451 .

 

R 325 .51106   RES CIND (DATE).

 

R 325 .51106   Sta rt -up dates ; tra ns itio na l p r ovisions .

      R u l e 6 .  (1 )  Sta rt -up dates  a r e as f o ll o w s :

(a)  )  T he  pe r m issibl e  exposu r e  li m its  speci f i ed  i n  t he  f i na l  r u l e  li m its co l umns  o f tabl e  G -1 -A sha ll b e  achieved   by  any  r easona bl e  com bi na tio n  o f                      eng i nee ri ng                       cont r o l s ,    w o r k     p r actices ,    and     pe r sona l     p r otective    e q u ip men t t h r ough  Decembe r 30 , 1993 .

(b)  )  T he  pe r m issibl e  exposu r e  li m its  speci f i ed  i n  t he  f i na l  r u l e  li m its co l umns o f tabl e G -1 -A sha ll b e  achieved  by  t he  me t hods  o f  comp li ance speci fi ed i n R 325 .51105 e ff ec tiv e Decembe r 31 , 1993 .

(2) )  T r ansitiona l p r ovisions  a r e as f o ll o w s :

(a)  ) T he  pe r m issibl e  exposu r e  li m its  speci f i ed  i n  t he  tra ns itio na l  li m its co l umn  o f tabl es G -1 -A, G -2 , and  G -3 sha ll continue  to b e  achieved  by t he me t hods o f comp li ance  speci f i ed  i n  R  325 .51105  t h r ough  Decembe r  30 , 1993 .

(b)  ) T he pe r m issibl e exposu r e li m its speci f i ed i n tabl es G -2 and G -3 f o r substances  men tio ned  i n  t he  f i na l r u l e  li m its  co l umn  o f tabl e  G -1 -A on l y by c r oss r e f e r ence to tabl e  G -2  o r  G -3  sha ll  r ema i n  i n  e ff ec t  i nde f i n it e l y and continue  to b e achieved  by t he me t hods  o f comp li ance  speci f i ed i n R 325 .51105 .

(c)  )  If any  ne w  o r  amended   p r ovisions   o r  ne w  o r  r ev is ed  li m its  f o r  any substance   o r  substances    a r e  e it he r  administ r ative l y  stayed   o r  jud icially      stayed    o r   vacated ,   t hen   t he   ex isti ng   p r ovisions              o r   li m its   f o r   t hose substances    speci f i ed  i n  t he  tra ns itio na l  li m its   co l umns   o f  tabl e  G -1 -A tabl e G -2 o r tabl e G -3 sha ll r ema i n i n e ff ec t un til such  stay  is lift ed o r , i f   t he li m it is vacated , sha ll r ema i n i n e ff ec t i nde f i n it e l y .

 

R 325 .51108    Tab les .

Rule 8.  Tables G-1-A AND G-2, an d G-3 read as follows :

TABLE G-1-A.  EXPOSURE LIMITS FOR AIR CONTAMINANTS
TRANSITIONAL LIMITS					FINAL RULE LIMITS**
		PEL*			TWA		STELD		Ceilin g
Substance	CAS No.A	ppmA	mg/m3B	Skin De- signation	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	m g / m 3   C	Ski n De- sig nat ion
Abate		–	15	–	–	15	–	–	–	–	–
Acetaldehyde	75-07-0	200	360	–	100	180	150	270	–	–	–
Acetic acid	64-19-7	10	25	–	10	25	–	–	–	–	–
Acetic anhydride	108-24-7	5	20	–	–	–	–	–	5	2 0	–
Acetone	67-64-1	1000	2400	–	750	1800	1000	2400	–	–	–
Acetonitrile	75-05-8	40	70	–	40	70	60	105	–	–	–
2-Acetylaminofluorine; see O.H. rule 2301(1)F	53-96-3
Acetylene dichloride; see 1,2- Dichloroethylene
Acetylene tetrabromide	79-27-6	1	14	–	1	14	–	–	–	–	–
Acetylsalicylic acid (Aspirin)	50-78-2	–	–	–	–	5	–	–	–	–	–
Acrolein	107-02-8	0.1	0.25	–	0.1	0.25	0.3	0.8	–	–	–
Acrylamide	79-06-1	–	0.3	x	–	0.03	–	–	–	–	x
Acrylic acid	79-10-7	–	–	–	10	30	–	–	–	–	x
Acrylonitrile; see R 325.51501 et seq.F	107-13-1				2	4.34	10	21.7
Aldrin	309-00-2	–	0.25	x	–	0.25	–	–	–	–	x
Allyl alcohol	107-18-6	2	5	x	2	5	4	10	–	–	x
Allyl chloride	107-05-1	1	3	–	1	3	2	6	–	–	–
Allyl glycidyl ether (AGE)	106-92-3	(C)10	(C)45	–	5	22	10	44	–	–	–
Allyl propyl disulfide	2179-59-1	2	12	–	2	12	3	18	–	–	–
alpha- Alumina(ALUMINUM OXIDE) RESPIRABLE FRACTION Total dust	1344-28-1	– –	15 5	– –	– –	5 10	– –	– –	– –	– –	– –

TOTAL DUST Respirable fraction
Aluminum (as Al) ALKYLS Metal METAL  Total dust Respirable DUST fraction TOTAL DUST Pyro powders PYRO POWDERS Welding Fumes* Soluble salts WELDING FUMES* Alkyls	7429-90-5	– – – – – –	15 5 – – – –	– – – – – –	- – – – – – –	2 15 5 15 5 5 2 5 2	- – – – – – –	- – – – – – –	- – – – – – –	- – – – – – –	- – – – – – –
4-Aminodiphenyl; see O.H. rule 2301(2)F	92-67-1
2-Aminoethanol; see Ethanolamine
2-Aminopyridine	504-29-0	0.5	2	–	0.5	2	–	–	–	–	–
Amitrole	61-82-5	–	–	–	–	0.2	–	–	–	–	–
Ammonia	7664-41-7	50	35	–	–	–	35	27	–	–	–
Ammonium chloride fume	12125-02-9	–	–	–	–	10	–	20	–	–	–
Ammonium sulfamate	7773-06-0	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
n-Amyl acetate	628-63-7	100	525	–	100	525	–	–	–	–	–
sec-Amyl acetate	626-38-0	125	650	–	125	650	–	–	–	–	–
Aniline and homologues	62-53-3	5	19	x	2	8	–	–	–	–	x
Anisidine (o- AND p- isomers)	29191-52-4	–	0.5	x	–	0.5	–	–	–	–	x
Antimony and compounds (as Sb)	7440-36-0	–	0.5	–	–	0.5	–	–	–	–	–
ANTU (alpha- naphthylthiourea)	86-88-4	–	0.3	–	–	0.3	–	–	–	–	–
Arsenic, organic compounds (as As)	7440-38-2	–	0.5	–	–	0.5	–	–	–	–	–
Arsenic, inorganic compounds (as As) see R 325.51601 et seq.F	7440-38-2					0.01
Arsine	7784-42-1	0.05	0.2	–	0.05	0.2	–	–	–	–	–
					TWA		STEL

ASBESTOS; SEE R 325.51311 ET SEQ.F	VARIES				0.2F/CC		1F/CC
Asbestos; see O.H. rule 2205	Varies
					ppmB	mg/m3C	ppmB	mg/m3C
Atrazine	1912-24-9	–	–	–	–	5	–	–	–	–	–
Azinphos-methyl	86-50-0	–	0.2	x	–	0.2	–	–	–	–	x
Barium, Soluble compounds (as Ba)	7440-39-3	–	0.5	–	–	0.5	–	–	–	–	–
Barium sulfate	7727-43-7	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Benomyl	17804-35-2	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
BENZENEE; SEE R 325.77101 ET SEQ.F AND TABLE G-2 FOR LIMITS APPLICABLE IN THE OPERATIONS OR SECTORS EXCLUDED IN R 325.77101E	71-43-2				1	3.19	5	15.97
Benzene; see R 325.77101 et seq.	71-43-2	See table G-2 for the limits applicable in the operations or sectors excluded in R 325.77101E
Benzidine; see O.H. rule 2301(3)	92-87-5
p-Benzoquinone; see Quinone
Benzo(a)pyrene; see Coal tar            pitch volatiles
Benzoyl peroxide	94-36-0	–	5	–	–	5	–	–	–	–	–
Benzyl chloride	100-44-7	1	5	–	1	5	–	–	–	–	–
Beryllium and beryllium           compounds (as Be)	7440-41-7	See table G-2			See table G-2
Biphenyl; see Diphenyl
Bismuth telluride, Undoped	1304-82-1	–	15	–	–	5 15	–	–	–	–	–

RESPIRABLE Total dust TOTAL DUST Respirable fraction		–	5	–	–	15 5	–	–	–	–	–
Bismuth telluride, Se- doped		–	–	–	–	5	–	–	–	–	–
Borates, Tetra, Sodium	1330-43-4	–	–	–	–	10	–	–	–	–	–
Salts
Anhydrous	1303-96-4	–	–	–	–	10	–	–	–	–	–
Decahydrate	12179-04-3	–	–	–	–	10	–	–	–	–	–
Pentahydrate
Boron oxide, Total dust	1303-86-2	–	15	–	–	10	–	–	–	–	–
Boron tribromide	10294-33-4	–	–	–	–	–	–	–	1	1 0	–
Boron trifluoride	7637-07-2	(C)1	(C)3	–	–	–	–	–	1	3	–
Bromacil	314-40-9	–	–	–	1	10	–	–	–	–	–
Bromine	7726-95-6	0.1	0.7	–	0.1	0.7	0.3	2	–	–	–
Bromine pentafluoride	7789-30-2	0.1	–	–	0.1	0.7	–	–	–	–	–
Bromoform	75-25-2	0.5	5	x	0.5	5	–	–	–	–	–
Butadiene (1,3- Butadiene); see R 325.50091 et seq.F	106-99-0	1000	2200	–	1	2.2	5 1000	11.1 2200	–	–	–
Butane	106-97-8	–	–	–	800	1900	–	–	–	–	–
Butanethiol; see Butyl mercaptan
2-Butanone (Methyl ethyl ketone)	78-93-3	200	590	–	200	590	300	885	–	–	–
2-Butoxyethanol	111-76-2	50	240	x	25	120	–	–	–	–	x
n-Butyl acetate	123-86-4	150	710	–	150	710	200	950	–	–	–
sec-Butyl acetate	105-46-4	200	950	–	200	950	–	–	–	–	–
tert-Butyl acetate	540-88-5	200	950	–	200	950	–	–	–	–	–
Butyl acrylate	141-32-2	–	–	–	10	55	–	–	–	–	–
n–Butyl alcohol (N- BUTANOL)	71-36-3	100	300	–	–	–	–	–	50	1 5 0	x
sec-Butyl alcohol (SEC-BUTANOL)	78-92-2	150	450	–	100	305	–	–	–	–	–
tert-Butyl alcohol(TERT-BUTANOL)	75-65-0	100	300	–	100	300	150	450	–	–	–
Butylamine	109-73-9	(C)5	(C)5	x	–	–	–	–	5	1 5	x
tert-Butyl chromate (as CrO3)	1189-85-1	–	(C)0.1	x	–	–	–	–	–	0 . 1	x

n-Butyl glycidyl ether (BGE)	2426-08-6	50	270	–	25	135	–	–	–	–	–
n-Butyl lactate	138-22-7	–	–	–	5	25	–	–	–	–	–
Butyl mercaptan	109-79-5	0.5	1.5	–	0.5	1.5	–	–	–	–	–
o-sec-Butylphenol	89-72-5	–	–	–	5	30	–	–	–	–	x
p-tert-Butyltoluene	98-51-1	10	60	–	10	60	20	120	–	–	–
Cadmium fume (as Cd)	7440-43-9	See table G-2			–	0.005	–	–	–	0	–
SEE R 325.51851 ET						(5UG/M3)				.
SEQ.F						0.1				3
Cadmium dust (as Cd)	7440-43-9	See table G-2			–	0.2	–	–	–	0 . 6	–
Calcium carbonate,	1317-65-3	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Calcium cyanamide	156-62-7	–	–	–	–	0.5	–	–	–	–	–
Calcium hydroxide	1305-62-0	–	–	–	–	5	–	–	–	–	–
Calcium oxide	1305-78-8	–	5	–	–	5	–	–	–	–	–
Calcium silicate,	1344-95-2	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Calcium sulfate,	7778-18-9	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Camphor, synthetic	76-22-2	–	2	–	–	2	–	–	–	–	–
Caprolactam,	105-60-2	– –	– –	– –	– 5	1 20	– 10	3 40	– –	– –	– –
Dust Vapor
Captafol (DifolatanR)	2425-06-1	–	–	–	–	0.1	–	–	–	–	–
Captan	133-06-2	–	–	–	–	5	–	–	–	–	–
Carbaryl (SevinR)	63-25-2	–	5	–	–	5	–	–	–	–	–
Carbofuran (FuradanR)	1563-66-2	–	–	–	–	0.1	–	–	–	–	–
Carbon black	1333-86-4	–	3.5	–	–	3.5	–	–	–	–	–
Carbon dioxide	124-38-9	5000	9000	–	10,00 0	18,000	30,000	54,000	–	–	–
Carbon disulfide	75-15-0	See table G-2			4	12	12	36	–	–	x
Carbon monoxide	630-08-0	50	55	–	35	40	–	–	200	2 2 9	–
Carbon tetrabromide	558-13-4	–	–	–	0.1	1.4	0.3	4	–	–	–

Carbon tetrachloride (TETRACHLOROMETHANE)

56-23-5

See table G-2

2

12.6

–

–

–

–

X

Carbonyl fluoride

353-50-4

–

–

–

2

5

5

15

–

–

–

Catechol (Pyrocatechol)

120-80-9

–

–

–

5

20

–

–

–

–

x

Cellulose,

9004-34-6

–

15

–

–

5 15

–

–

–

–

–

RESPIRABLE Total

dust

–

5

–

–

15 5

–

–

–

–

–

TOTAL DUST

Respirable fraction

Cesium hydroxide

21351-79-1

–

–

–

–

2

–

–

–

–

–

Chlordane

57-74-9

–

0.5

x

–

0.5

–

–

–

–

x

Chlorinated camphene (TOXAPHONE)

8001-35-2

–

0.5

x

–

0.5

–

1

–

–

x

Chlorinated diphenyl oxide

55720-99-5 OR 31242-93-0

–

0.5

–

–

0.5

–

–

–

–

–

Chlorine

7782-50-5

(C)1

(C)3

–

0.5

1.5

1

3

–

–

–

Chlorine dioxide

10049-04-4

0.1

0.3

–

0.1

0.3

0.3

0.9

–

–

–

Chlorine trifluoride

7790-91-2

(C)0.1

(C)0.4

–

–

–

–

–

0.1

0 . 4

–

Chloroacetaldehyde

107-20-0

(C)1

(C)3

–

–

–

–

–

1

3

–

a 2-Chloroacetophenone (Phenacyl chloride)

532-27-4

0.05

0.3

–

0.5

0.3

–

–

–

–

–

Chloroacetyl chloride

79-04-9

–

–

–

0.5

0.2

–

–

–

–

–

Chlorobenzene

108-90-7

75

350

–

75

350

–

–

–

–

–

o-Chlorobenzylidene

2698-41-1

0.05

0.4

–

–

–

–

–

0.0

0

x

malononitrile

5

.

4

Chlorobromomethane

74-97-5

200

1050

–

200

1050

–

–

–

–

–

2-Chloro-1,3- butadiene; see  b-Chloroprene

Chlorodifluoromethane

75-45-6

–

–

–

1000

3500

–

–

–

–

–

Chlorodiphenyl (42% Chlorine) (PCB)

53469-21-9

–

1

x

–

1

–

–

–

–

x

Chlorodiphenyl (54% Chlorine) (PCB)

11097-69-1

–

0.5

x

–

0.5

–

–

–

–

x

1-Chloro-2,3-epoxy propane; see Epichlorohydrin

2-Chloroethanol; see Ethylene

chlorohydrin
Chloroethylene; see Vinyl chloride
Chloroform (Trichloromethane)	67-66-3	(C)50	(C)240	–	2	9.78	–	–	–	–	–
bis(Chloromethyl)ether ; see O.H. Rule 2301(4)F	542-88-1
Chloromethyl methyl ether; see O.H. rule 2301(8)	107-30-2
1-Chloro-1- nitropropane	600-25-9	20	100	–	4	10	–	–	–	–	–
Chloropentafluoroethan e	76-15-3	–	–	–	1000	6320	–	–	–	–	–
Chloropicrin	76-06-2	0.1	0.7	–	0.1	0.7	–	–	–	–	–
beta-Chloroprene	126-99-8	25	90	x	10	35	–	–	–	–	x
o-Chlorostyrene	2039-87-4	–	–	–	50	285	75	428	–	–	–
o-Chlorotoluene	95-49-8	–	–	–	50	250	–	–	–	–	–
2-Chloro-6	1929-82-4	–	15	–	–	5 15	–	–	–	–	–
-
(trichloromethyl)pyrid
ine,		–	5	–	–	15 5	–	–	–	–	–
RESPIRABLE Total
dust
TOTAL DUST
Respirable fraction
Chlorpyrifos	2921-88-2	–	–	–	–	0.2	–	–	–	–	x
Chromic acid and chromates (as CrO3)	Varies with compound	See table G-2			–	–	–	–	–	0 . 1	–
Chromium (II) compounds (as Cr)	7440-47-3	–	0.5	–	–	0.5	–	–	–	–	–
Chromium (III) compounds (as Cr)	7440-47-3	–	0.5	–	–	0.5	–	–	–	–	–
Chromium metal (as Cr)	7440-47-3	–	1	–	–	1	–	–	–	–	–
Chrysene; see Coal tar pitch volatile
Clopidol	2971-90-6	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Coal dust (less than

5% SiO2) Respirable quartz DUST faction	–	See table G-3			–	2	–	–	–	–	–
Coal dust (greater than or               equal to 5% SiO2), Respirable DUST fraction	–	See table G-3			–	0.1	–	–	–	–	–
Coal tar pitch volatile (AS benzene solubleS fraction) anthracene, BaP, phenanthrene, acridine, crysene, pyrene	65996-93-2	–	0.2	–	–	0.2	–	–	–	–	–
Cobalt metal, dust, and fume (as Co)	7440-48-4	–	0.1	–	–	0.05	–	–	–	–	–
Cobalt carbonyl (as Co)	10210-68-1	–	–	–	–	0.1	–	–	–	–	–
Cobalt hydrocarbonyl (as Co)	16842-03-8	–	–	–	–	0.1	–	–	–	–	–
Coke oven emissions; see R 325.50101 et seq.F	–					0.15 (150UG/M3)
Copper,	7440-50-8	–	0.1	–	–	1	–	–	–	–	–
DUSTS AND MISTS (AS
CU)		–	1	–	–	0.1	–	–	–	–	–
FUME (AS CU)						1
Dusts and mists (as
Cu)
Cotton dust (raw)	–		1			1	–	–	–	–	–
Crag herbicide	136-78-7	–	15	–	–	10	–	–	–	–	–
(Sesone)
Total dust		–	5	–	–	5	–	–	–	–	–
Respirable fraction
Cresol, all isomers	1319-77-3	5	22	x	5	22	–	–	–	–	x
Crotonaldehyde	123-73-9 4170-30-3	2	6	–	2	6	–	–	–	–	–
Crufomate	299-86-5	–	–	–	–	5	–	–	–	–	–
Cumene	98-82-8	50	245	x	50	245	–	–	–	–	x
Cyanamide	420-04-2	–	–	–	–	2	–	–	–	–	–
Cyanides (as CN)	Varies with compound	–	5	–	–	5	–	–	–	–	X
Cyanogen	460-19-5	10	–	–	10	20	–	–	–	–	–

Cyanogen chloride	506-77-4	–	–	–	–	–	–	–	0.3	0 . 6	–
Cyclohexane	110-82-7	300	1050	–	300	1050	–	–	–	–	–
Cyclohexanol	108-93-0	50	200	–	50	200	–	–	–	–	x
Cyclohexanone	108-94-1	50	200	–	25	100	–	–	–	–	x
Cyclohexene	110-83-8	300	1015	–	300	1015	–	–	–	–	–
Cyclohexylamine	108-91-8	–	–	–	10	40	–	–	–	–	–
Cyclonite	121-82-4	–	–	–	–	1.5	–	–	–	–	x
Cyclopentadiene	542-92-7	75	200	–	75	200	–	–	–	–	–
Cyclopentane	287-92-3	–	–	–	600	1720	–	–	–	–	–
Cyhexatin	13121-70-5	–	–	–	–	5	–	–	–	–	–
2,4-D (Dichlorophenoxyacetic acid)	94-75-7	–	-	–	–	10	–	–	–	–	–
Decaborane	17702-41-9	0.05	0.3	x	0.05	0.3	0.15	0.9	–	–	x
Demeton (SystoxR)	8065-48-3	–	0.1	x	–	0.1	–	–	–	–	x
Diacetone alcohol (4-Hydroxy-4-methyl-2- pentanone)	123-42-2	50	240	–	50	240	–	–	–	–	–
1,2-Diaminoethane; see Ethylenediamine
Diazinon	333-41-5	–	–	–	–	0.1	–	–	–	–	x
Diazomethane	334-88-3	0.2	0.4	–	0.2	0.4	–	–	–	–	–
Diborane	19287-45-7	0.1	0.1	–	0.1	0.1	–	–	–	–	–
2-N- Dibutylaminoethanol	102-81-8	–	–	–	2	14	–	–	–	–	–
Dibutyl phosphate	107-66-4	1	5	–	1	5	2	10	–	–	–
DIBUTYL PHTHALATE	84-74-2	–	5	–	–	5	–	–	–	–	–
DICHLOROACETYLENE	7572-29-4	–	–	–	–	–	–	–	0.1	0 . 4	–
O-DICHLOROBENZENE	95-50-1	-	-	–	–	–	–	–	50	3 0 0	–
P-DICHLOROBENZENE	106-46-7	-	-	–	75	450	110	675	–	–	–
3,3'- DICHLOROBENZIDINE; SEE O.H. RULE 2301(5)F	91-94-1
DICHLORODIFLUOROMETHAN E	75-71-8	-	-	–	1000	4950	–	–	–	–	–
1,3-DICHLORO-5,5- DIMETHYL HYDANTOIN	118-52-5	–	-	–	–	0.2	–	0.4	–	–	–
Dichloroacetylene	7572-29-4	0.1	0.4	–	–	–	–	–	0.1	0	–

										. 4
Dichlorodiphenyltri- chloroethane    (DDT)	50-29-3	–	1	x	–	1	–	–	–	–	x
Dichlorvos (DDVP)	62-73-7	–	1	x	–	-	–	–	–	–	-
Dibutyl phthalate	84-74-2	–	5	–	–	-	–	–	–	–	–
Dichloroacetylene	7572-29-4	–	–	–	–	–	–	–	-	-	–
o-Dichlorobenzene	95-50-1	(C)50	(C)300	–	–	–	–	-	-	-	–
p-Dichlorobenzene	106-46-7	75	450	–	-	-	-	-	–	–	–
3,3'- Dichlorobenzidine;   see O.H. rule 2301(5)	91-94-1
Dichlorodifluoromethan e	75-71-8	1000	4950	–	-	-	–	–	–	–	–
1,3-Dichloro-5,5- dimethyl   hydantoin	118-52-5	–	0.2	–	–	-	–	-	–	–	–
1,1-Dichloroethane	75-34-3	100	400	–	100	400	–	–	–	–	–
1,2-Dichloroethylene	540-59-0	200	790	–	200	790	–	–	–	–	–
Dichloroethyl ether	111-44-4	(C)15	(C)90	x	5	30	10	60	–	–	x
DICHLOROMONOFLUOROMETH ANE	75-43-4	-	-	–	10	40	–	–	–	–	–
Dichloromethane; see Methylene chloride
Dichloromonofluorometh ane	75-43-4	1000	4200	–	-	-	–	–	–	–	–
1,1-Dichloro-1- nitroethane	594-72-9	(C)10	(C)60	–	2	10	–	–	–	–	–
1,2-Dichloropropane; see Propylene dichloride
1,3-Dichloropropene	542-75-6	–	–	–	1	5	–	–	–	–	x
2,2-Dichloropropionic acid	75-99-0	–	–	–	1	6	–	–	–	–	–
Dichlorotetrafluoroeth ane	76-14-2	1000	7000	–	1000	7000	–	–	–	–	–
DICHLORVOS (DDVP)	62-73-7	–	-	-	–	1	–	–	–	–	X
Dicrotophos	141-66-2	–	–	–	–	0.25	–	–	–	–	x
Dicyclopentadiene	77-73-6	–	–	–	5	30	–	–	–	–	–
Dicyclopentadienyl	102-54-5	–	15	–	–	5 10	–	–	–	–	–
iron,
RESPIRABLE Total		–	5	–	–	10 5	–	–	–	–	–
dust
TOTAL DUST

Respirable fraction
Dieldrin	60-57-1	–	0.25	x	–	0.25	–	–	–	–	x
Diethanolamine	111-42-2	–	–	–	3	15	–	–	–	–	–
Diethylamine	109-89-7	25	75	–	10	30	25	75	–	–	–
2-Diethylaminoethanol	100-37-8	10	50	x	10	50	–	–	–	–	x
Diethylene triamine	111-40-0	10	42	x	1	4	–	–	–	–	x
Diethyl ether; see Ethyl ether
Diethyl ketone	96-22-0	–	–	–	200	705	–	–	–	–	–
Diethyl phthalate	84-66-2	–	–	–	–	5	–	–	–	–	–
Difluorodibromomethane	75-61-6	100	860	–	100	860	–	–	–	–	–
Diglycidyl ether (DGE)	2238-07-5	(C)0.5	(C)2.8	–	0.1	0.5	–	–	–	–	–
Dihydroxybenzene; see Hydroquinone
Diisobutyl ketone	108-83-8	50	290	–	25	150	–	–	–	–	–
Diisopropylamine	108-18-9	5	20	x	5	20	–	–	–	–	x
4- Dimethylaminoazobenzen e; see O.H. rule 2301(6)F	60-11-7
Dimethoxymethane; see Methylal
Dimethyl acetamide	127-19-5	10	35	x	10	35	–	–	–	–	x
Dimethylamine	124-40-3	10	18	–	10	18	–	–	–	–	–
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N- Dimethylaniline)	121-69-7	5	25	x	5	25	10	50	–	–	x
Dimethylbenzene; see Xylene
Dimethyl-1,2-dibromo- 2,2- dichloroethyl phosphate	300-76-5	–	3	–	–	3	–	–	–	–	x
Dimethylformamide	68-12-2	10	30	x	10	30	–	–	–	–	x
2,6-Dimethyl-4- heptanone; see Diisobutyl ketone
1,1-Dimethylhydrazine	57-14-7	0.5	1	x	0.5	1	–	–	–	–	x
Dimethylphthalate	131-11-3	–	5	–	–	5	–	–	–	–	–
Dimethyl sulfate	77-78-1	1	5	x	0.1	0.5	–	–	–	–	x
Dinitolmide (3,5-Dinitro-o- toluamide)	148-01-6	–	–	–	–	5	–	–	–	–	–

Dinitrobenzene  (all isomers) (META-) (alpha-) (ORTHO) (meta-)   (para-)	99-65-0 528-29-0 99-65-0 100-25-4	–	1	x	-	1	-	-	-	-	X
Dinitro-o-cresol	534-52-1	–	0.2	x	–	0.2	–	–	–	–	x
Dinitrotoluene	25321-14-6	–	1.5	x	–	1.5	–	–	–	–	x
Dioxane (Diethylene dioxide)	123-91-1	100	360	x	25	90	–	–	–	–	x
Dioxathion (Delnav)	78-34-2	–	–	–	–	0.2	–	–	–	–	x
Diphenyl (Biphenyl)	92-52-4	0.2	1	–	0.2	1	–	–	–	–	–
Diphenylamine	122-39-4	–	10	–	–	10	–	–	–	–	–
Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate
Dipropylene glycol methyl ether	34590-94-8	100	600	x	100	600	150	900	–	–	x
Dipropyl ketone	123-19-3	–	–	–	50	235	–	–	–	–	–
Diquat	2768-72-9 85-00-7	–	–	–	–	0.5	–	–	–	–	–
Di-sec-octyl phthalate [DI(2- ETHYLHEXYL)PHTHALATE] (Di-2- ethylhexylphthalate)	117-81-7	–	5	–	–	5	–	10	–	–	–
Disulfiram	97-77-8	–	–	–	–	2	–	–	–	–	–
Disulfoton	298-04-4	–	–	–	–	0.1	–	–	–	–	x
2,6-Di-tert-butyl-p- cresol (BUTYLATED HYDROXYTOLUENE)	128-37-0	–	–	–	–	10	–	–	–	–	–
Diuron	330-54-1	–	–	–	–	10	–	–	–	–	–
Divinyl benzene	1321-74-0	–	–	–	10	50	–	–	–	–	–
Emery,	1302.74-5	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total	112-62-9
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Endosulfan	115-29-7	–	0.1	x	–	0.1	–	–	–	–	x
Endrin	72-20-8	–	0.1	x	–	0.1	–	–	–	–	x
Epichlorohydrin	106-89-8	5	19	x	2	8	–	–	–	–	x
EPN	2104-64-5	–	0.5	x	–	0.5	–	–	–	–	x
1,2-Epoxypropane; see Propylene oxide

2,3-Epoxy-1-propanol; see Glycidol
Ethanethiol; see Ethyl mercaptan
Ethanolamine	141-43-5	3	6	–	3	8	6	15	–	–	–
Ethion	563-12-2	–	–	–	–	0.4	–	–	–	–	x
2-Ethoxyethanol (EGEE)	110-80-5	200	740	x	200	740	–	–	–	–	x
2-Ethoxyethyl acetate (Cellosolve acetate)	111-15-9	100	540	x	100	540	–	–	–	–	x
Ethyl acetate	141-78-6	400	1400	–	400	1400	–	–	–	–	–
Ethyl acrylate	140-88-5	25	100	x	5	20	25	100	–	–	x
Ethyl alcohol (Ethanol)	64-17-5	1000	1900	–	1000	1900	–	–	–	–	–
Ethylamine	75-04-7	10	18	–	10	18	–	–	–	–	–
Ethyl amyl ketone (5-Methyl-3- heptanone)	541-85-5	25	130	–	25	130	–	–	–	–	–
Ethyl benzene	100-41-4	100	435	–	100	435	125	545	–	–	–
Ethyl bromide	74-96-4	200	890	–	200	890	250	1100	–	–	–
Ethyl butyl ketone (3- Heptanone)	106-35-4	50	230	–	50	230	–	–	–	–	–
Ethyl chloride	75-00-3	1000	2600	–	1000	2600	–	–	–	–	–
Ethyl ether	60-29-7	400	1200	–	400	1200	–	500	150 0	–	–
Ethyl formate	109-94-4	100	300	–	100	300	–	–	–	–	–
Ethyl mercaptan	75-08-1	(C)10	(C)25	–	0.5	1	–	–	–	–	–
Ethyl silicate	78-10-4	100	850	–	10	85	–	–	–	–	–
Ethylene chlorohydrin	107-07-3	5	16	x	–	–	–	–	1	3	x
Ethylenediamine	107-15-3	10	25	–	10	25	–	–	–	–	–
Ethylene dibromide	106-93-4	See table G-2			See table G-2
Ethylene dichloride	107-06-2	See table G-2			1	4	2	8	–	–	–
Ethylene glycol	107-21-1	–	–	–	–	–	–	–	50	1 2 5	–
Ethylene glycol dinitrate (EGDN)	628-96-6	(C)0.2	(C)1	x	–	–	–	0.1	–	–	x
Ethylene glycol methyl acetate (EGME); see Methyl cellosolve acetate
Ethyleneimine; see O.H. rule 2301(7)	151-56-4
Ethylene oxide; see R 325.51151 et	75-21-8				1	1.8	5	9.0	-	-	-

seq.F
Ethylidene chloride; see 1,1- Dichloroethane
Ethylidene norbornene	16219-75-3	–	–	–	–	–	–	–	5	2 5	–
N-Ethylmorpholine	100-74-3	20	94	x	5	23	–	–	–	–	x
Fenamiphos	22224-92-6	–	–	–	–	0.1	–	–	–	–	x
Fensulfothion (Dasanit)	115-90-2	–	–	–	–	0.1	–	–	–	–	–
Fenthion	55-38-9	–	–	–	–	0.2	–	–	–	–	x
Ferbam, Total Dust	14484-64-1	–	15	–	–	10	–	–	–	–	–
Ferrovanadium dust	12604-58-9	–	1	–	–	1	–	3	–	–	–
Fluorides (as F)	Varies with compound	–	2.5	–	–	2.5	–	–	–	–	–
Fluorine	7782-41-4	0.1	0.2	–	0.1	0.2	–	–	–	–	–
Fluorotrichloromethane	75-69-4	1000	5600	–	–	–	–	–	100	5	–
(Trichlorofluoromethan									0	6
e)										0
										0
Fonofos	944-22-9	–	–	–	–	0.1	–	–	–	–	x
Formaldehyde; see R 325.51451 et seq.F	50-00-0	See table G-2			0.75	0.9	2	2.5
Formamide	75-12-7	–	–	–	20	30	30	45	–	–	–
Formic acid	64-18-6	5	9	–	5	9	–	–	–	–	–
Furfural	98-01-1	5	20	x	2	8	–	–	–	–	x
Furfuryl alcohol	98-00-0	50	200	–	10	40	15	60	–	–	x
Gasoline	8006-61-9	–	–	–	300	900	500	1500	–	–	–
Germanium tetrahydride	7782-65-2	–	–	–	0.2	0.6	–	–	–	–	–
Glutaraldehyde	111-30-8	–	–	–	–	–	–	–	0.2	0 . 8	–
Glycerin, (mist)	56-81-5	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE MIST
Total dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL MIST
Respirable fraction
Glycidol	556-52-5	50	150	–	25	75	–	–	–	–	–
Glycol monoethyl ether; see 2-Ethoxyethanol
Grain dust (Oat, wheat, barley)	–	–	–	–	–	10	–	–	–	–	–
Graphite, natural

Respirable dust	7782-42-5	See table G-3			–	2.5	–	–	–	–	–
Graphite, synthetic, RESPIRABLE Total dust TOTAL DUST Respirable fraction	–	– –	15 5	– –	– –	5 10 10 5	– –	– –	– –	– –	– –
GuthionR; see Azinphos methyl
Gypsum,	13397-24-5	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Hafnium	7440-58-6	–	0.5	–	–	0.5	–	–	–	–	–
Heptachlor	76-44-8	–	0.5	x	–	0.5	–	–	–	–	x
Heptane (n-Heptane)	142-82-5	500	2000	–	400	1600	500	2000	–	–	–
Hexachlorobutadiene	87-68-3	–	–	–	–	0.02	0.24	–	–	–	–
Hexachlorocyclopentadi ene	77-47-4	–	–	–	0.01	0.1	–	–	–	–	–
Hexachloroethane	67-72-1	1	10	x	1	10	–	–	–	–	x
Hexachloronaphthalene	1335-87-1	–	0.2	x	–	0.2	–	–	–	–	x
Hexafluoroacetone	684-16-2	–	–	–	0.1	0.7	–	–	–	–	x
n-Hexane	110-54-3	500	1800	–	50	180	–	–	–	–	–
Hexane isomers	Varies with compound	–	–	–	500	1800	1000	3600	–	–	–
2-Hexanone (Methyl n-butyl ketone)	591-78-6	100	410	–	5	20	–	–	–	–	–
Hexone (Methyl isobutyl ketone)	108-10-1	100	410	–	50	205	75	300	–	–	–
sec-Hexyl acetate	108-84-9	50	300	–	50	300	–	–	–	–	–
Hexylene glycol	107-41-5	–	–	–	–	–	–	–	25	1 2 5	–
Hydrazine	302-01-2	1	1.3	x	0.1	0.1	–	–	–	–	x
Hydrogenated terphenyls	61788-32-7	–	–	–	0.5	5	–	–	–	–	–
Hydrogen bromide	10035-10-6	3	10	–	–	–	–	–	3	1 0	–
Hydrogen chloride	7647-01-0	(C)5	(C)7	–	–	–	–	–	5	7	–
Hydrogen cyanide	74-90-8	10	11	x	–	–	4.7	5	–	–	x
Hydrogen fluoride (as F)	7664-39-3	See table G-2			3	–	6	–	–	–	–
Hydrogen peroxide	7722-84-1	1	1.4	–	1	1.4	–	–	–	–	–
Hydrogen selenide (as Se)	7783-07-5	0.05	0.2	–	0.05	0.2	–	–	–	–	–

Hydrogen sulfide	7783-06-4	See table G-2			10	14	15	21	–	–	–
Hydroquinone	123-31-9	–	2	–	–	2	–	–	–	–	–
2-Hydroxypropyl acrylate	999-61-1	–	–	–	0.5	3	–	–	–	–	x
Indene	95-13-6	10	45	–	10	45	–	–	–	–	–
Indium and compounds (as In)	7440-74-6	–	0.1	–	–	0.1	–	–	–	–	–
Iodine	7553-56-2	(C)0.1	(C)1	–	–	–	–	–	0.1	1	–
Iodoform	75-47-8	–	–	–	0.6	10	–	–	–	–	–
Iron oxide fume	1309-37-1	–	10	–	–	10	–	–	–	–	–
Iron pentacarbonyl (as Fe)	13463-40-6	–	–	–	0.1	0.8	0.2	1.6	–	–	–
Iron salts (soluble) (as Fe)	Varies with compound	–	1	–	–	1	–	–	–	–	–
Isoamyl acetate	123-92-2	100	525	–	100	525	–	–	–	–	–
Isoamyl alcohol (primary and secondary)	123-51-3	100	360	–	100	360	125	450	–	–	–
Isobutyl acetate	110-19-0	150	700	–	150	700	–	–	–	–	–
Isobutyl alcohol	78-83-1	100	300	–	50	150	–	–	–	–	–
Isooctyl alcohol	26952-21-6	–	–	–	50	270	–	–	–	–	x
Isophorone	78-59-1	25	140	–	4	23	–	–	–	–	–
Isophorone diisocyanate	4098-71-9	–	–	–	0.005	–	0.02	–	–	–	x
2-Isopropoxyethanol	109-59-1	–	–	–	25	105	–	–	–	–	–
Isopropyl acetate	108-21-4	250	950	–	250	950	310	1185	–	–	–
Isopropyl alcohol	67-63-0	400	980	–	400	980	500	1225	–	–	–
Isopropylamine	75-31-0	5	12	–	5	12	10	24	–	–	–
N-Isopropylaniline	768-52-5	–	–	–	2	10	–	–	–	–	x
Isopropyl ether	108-20-3	500	2100	–	500	2100	–	–	–	–	–
Isopropyl glycidyl ether (IGE)	4016-14-2	50	240	–	50	240	75	360	–	–	–
Kaolin,	–	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Ketene	463-51-4	0.5	0.9	–	0.5	0.9	1.5	3	–	–	–
Lead inorganic (as Pb); see R 325.51901 et seq.F	7439-92-1	–	–	–	–	0.05 (50UG/M3)	–	–	–	–	–
Limestone, (CALCIUM	1317-65-3	–	15	–	–	5 15	–	–	–	–	–
CARBONATE)
RESPIRABLE Total		–	5	–	–	15 5	–	–	–	–	–
dust

TOTAL DUST Respirable fraction
Lindane	58-89-9	–	0.5	x	–	0.5	–	–	–	–	x
Lithium hydride	7580-67-8	–	0.025	–	–	0.025	–	–	–	–	–
L.P.G. (Liquified petroleum gas)	68476-85-7	1000	1800	–	1000	1800	–	–	–	–	–
Magnesite,	546-93-0	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Magnesium oxide fume, Total particulate	1309-48-4	–	15	–	–	10	–	–	–	–	–
Malathion Total Dust	121-75-5	–	15	x	–	10	–	–	–	–	x
Maleic anhydride	108-31-6	0.25	1	0.25	1	–	–	–	–	–	–
MANGANESE,	7439-96-5	- -	- -	- -	- -	- 1	- -	- 3	- -	5 -	- -
COMPOUNDS (AS MN) FUME (AS MN)
Manganese compounds (as Mn)	7439-96-5	–	(C)5	–	–	–	–	–	–	5	–
Manganese fume (as Mn)	7439-96-5	–	(C)5	–	–	1	–	3	–	–	–
Manganese cyclopentadienyl tricarbonyl (as Mn)	12079-65-1	–	–	–	–	0.1	–	–	–	–	x
Manganese tetroxide (as Mn)	1317-35-7	–	–	–	–	1	–	–	–	–	–
Marble, (CALCIUM	1317-65-3	–	15	–	–	5 15	–	–	–	–	–
CARBONATE)
RESPIRABLE Total		–	5	–	–	15 5	–	–	–	–	–
dust
TOTAL DUST
Respirable fraction
MERCURY	7439-97-6				-   - -	- 0.01 0.05	-   - -	- 0.03 -	-   - -	0 . 1   - -	X   X X
INORGANIC AND ARYL COMPOUNDS (AS HG) ORGANIC COMPOUNDS (AS HG) VAPOR ( AS HG)
Mercury (aryl and inorganic   compounds) (as Hg)	7439-97-6	See table G-2			–	–	–	–	–	0 . 1	x
Mercury (organo) alkyl compounds   (as Hg)	7439-97-6	See table G-2			–	0.01	–	0.03	–	–	x

Mercury (vapor) (as Hg)	7439-97-6	See table G-2			–	0.05	–	–	–	–	x
Mesityl oxide	141-79-7	25	100	–	15	60	25	100	–	–	–
Methacrylic acid	79-41-4	–	–	–	20	70	–	–	–	–	x
Methanethiol; see Methyl mercaptan
Methomyl (Lannate)	16752-77-5	–	–	–	–	2.5	–	–	–	–	–
Methoxychlor Total Dust	72-43-5	–	15	–	–	10	–	–	–	–	–
2-Methoxyethanol; see Methyl cellosolve
4-Methoxyphenol	150-76-5	–	–	–	–	5	–	–	–	–	–
Methyl acetate	79-20-9	200	610	–	200	610	250	760	–	–	–
Methyl acetylene (Propyne)	74-99-7	1000	1650	–	1000	1650	–	–	–	–	–
Methyl acetylene- propadiene mixture (MAPP)	–	1000	1800	–	1000	1800	1250	2250	–	–	–
Methyl acrylate	96-33-3	10	35	x	10	35	–	–	–	–	x
Methylacrylonitrile	126-98-7	–	–	–	1	3	–	–	–	–	x
Methylal (Dimethoxymethane)	109-87-5	1000	3100	–	1000	3100	–	–	–	–	–
Methyl alcohol	67-56-1	200	260	–	200	260	250	325	–	–	x
Methylamine	74-89-5	10	12	–	10	12	–	–	–	–	–
Methyl amyl alcohol; see Methyl isobutyl carbinol
Methyl n-amyl ketone	110-43-0	100	465	–	100	465	–	–	–	–	–
Methyl bromide	74-83-9	(C)20	(C)80	x	5	20	–	–	–	–	x
Methyl N-butyl ketone; see 2-Hexanone
Methyl cellosolve (2-Methoxyethanol)	109-86-4	25	80	x	25	80	–	–	–	–	x
Methyl cellosolve acetate (2-Methoxyethyl acetate)	110-49-6	25	120	x	25	120	–	–	–	–	x
Methyl chloride	74-87-3	See table G-2			50	105	100	210	–	–	–
Methyl chloroform (1,1,1- Trichloroethane)	71-55-6	350	1900	–	350	1900	450	2450	–	–	–
Methyl 2-cyanoacrylate	137-05-3	–	–	–	2	8	4	16	–	–	–
Methylcyclohexane	108-87-2	500	2000	–	400	1600	–	–	–	–	–
Methylcyclohexanol	25639-42-3	100	470	–	50	235	–	–	–	–	–
o-Methylcyclohexanone	583-60-8	100	460	x	50	230	75	345	–	–	x
Methylcyclopentadienyl

manganese tricarbonyl (as Mn)

12108-13-3

–

–

–

–

0.2

–

–

–

–

x

Methyl demeton

8022-00-2

–

–

–

–

0.5

–

–

–

–

x

4,4'-Methylene bis (2-chloroaniline) (MBOCA)

101-14-4

–

–

–

0.02

0.22

–

–

–

–

x

Methylene bis

5124-30-1

–

–

–

–

–

–

–

0.0

0

–

(4-

cyclohexylisocyanate)

1

.

1

1

METHYLENE BISPHENYL

101-68-8

-

-

–

–

–

–

–

0.0

0

–

ISOCYANATE (MDI)

2

.

2

Methylene chloride SEE R 325.51651 ET SEQ.F

75-09-2

See table G-2

25

87

125

434

METHYLENEDIANILINE (MDA); SEE R 325.50051 ET SEQ.F

101-77-9

-

-

-

10 PPB**

0.08 MG/M3

100 PPB**

0.8 MG/M3

-

-

-

Methyl ethyl ketone (MEK); see 2-Butanone

Methyl ethyl ketone peroxide (MEKP)

1338-23-4

–

–

–

–

–

–

–

0.7

5

–

Methyl formate

107-31-3

100

250

–

100

250

150

375

–

–

–

Methyl hydrazine (Monomethyl hydrazine)

60-34-4

(C)0.2

(C)0.35

x

–

–

–

–

0.2

0 . 3 5

x

Methyl iodide

74-88-4

5

28

x

2

10

–

–

–

–

x

Methyl isoamyl ketone

110-12-3

100

475

–

50

240

–

–

–

–

–

Methyl isobutyl carbinol

108-11-2

25

100

x

25

100

40

165

–

–

x

Methyl isobutyl ketone; see Hexone

Methyl isocyanate (MIC)

624-83-9

0.02

0.05

x

0.02

0.05

–

–

–

–

x

Methyl isopropyl ketone

563-80-4

–

–

–

200

705

–

–

–

–

–

Methyl mercaptan

74-93-1

(C)10

(C)20

–

0.5

1

–

–

–

–

–

Methyl methacrylate

80-62-6

100

410

100

410

–

–

–

–

Methyl parathion	298-00-0	–	–	–	–	0.2	–	–	–	–	x
Methyl propyl ketone; see 2-Pentanone
Methyl silicate	681-84-5	5	30	–	1	6	–	–	5	3 0	–
alpha-Methyl styrene	98-83-9	(C)100	(C)480	–	50	240	100	485	–	–	–
Methylene bisphenyl   isocyanate (MDI)	101-68-8	(C)0.02	(C)0.2	–	–	–	–	–	-	-	–
Metribuzin	21087-64-9	–	–	–	–	5	–	–	–	–	–
Mica; see Silicates
Molybdemun, (as Mo)	7439-98-7	–	5	–	–	10 5	–	–	–	–	–
INsoluble compounds
InSoluble compounds		–	15	–	–	5 10	–	–	–	–	–
Total dust
Monocrotophos (AzodrinR)	6923-22-4	–	–	–	–	0.25	–	–	–	–	–
Monomethyl aniline	100-61-8	2	9	x	0.5	2	–	–	–	–	x
Morpholine	110-91-8	20	70	x	20	70	30	105	–	–	x
Naphtha (Coal tar)	8030-30-6	100	400	–	100	400	–	–	–	–	–
Naphthalene	91-20-3	10	50	–	10	50	15	75	–	–	–
alpha-Naphthylamine; see O.H. rule 2301(10)F	134-32-7
beta-Naphthylamine; see O.H. rule 2301(11)F	91-59-8
Nickel carbonyl (as Ni)	13463-39-3	0.001	0.007	–	0.001	0.007	–	–	–	–	–
NICKEL,	7440-02-0				-	1	-	-	-	-	-
METAL AND INSOLUBLE
COMPOUNDS
(AS NI)					-	0.1	-	-	-	-	-
SOLUBLE COMPOUNDS
(AS NI)
Nickel, metal and insoluble   compounds (as Ni)	7440-02-0	–	1	–	–	1	–	–	–	–	–
Nickel, soluble compounds(as Ni)	7440-02-0	–	1	–	–	0.1	–	–	–	–	–
Nicotine	54-11-5	–	0.5	x	–	0.5	–	–	–	–	x
Nitric acid	7697-37-2	2	5	–	2	5	4	10	–	–	–
Nitric oxide	10102-43-9	25	30	–	25	30	–	–	–	–	–
p-Nitroaniline	100-01-6	1	6	x	–	3	–	–	–	–	x
Nitrobenzene	98-95-3	1	5	x	1	5	–	–	–	–	x
p-Nitrochlorobenzene	100-00-5	–	1	x	–	1	–	–	–	–	x

4-Nitrodiphenyl; see O.H. rule 2301(12)F	92-93-3
Nitroethane	79-24-3	100	310	–	100	310	–	–	–	–	–
Nitrogen dioxide	10102-44-0	(C)5	(C)9	–	–	–	1	1.8	–	–	–
Nitrogen trifluoride	7783-54-2	10	29	–	10	29	–	–	–	–	–
Nitroglycerin	55-63-0	(C)0.2	(C)2	x	–	–	–	0.1	–	–	x
Nitromethane	75-52-5	100	250	–	100	250	–	–	–	–	–
1-Nitropropane	108-03-2	25	90	–	25	90	–	–	–	–	–
2-Nitropropane	79-46-9	25	90	–	10	35	–	–	–	–	–
N- Nitrosodimethylamine; see O.H. rule 2301(13)F	62-75-9
Nitrotoluene	88-72-2;	5	30	x	2	11	–	–	–	–	x
o-isomer
m-isomer	99-08-1;
p-isomer	99-99-0
Nitrotrichloromethane; see Chloropicrin
Nonane	111-84-2	–	–	–	200	1050	–	–	–	–	–
Octachloronaphthalene	2234-13-1	–	0.1	x	–	0.1	–	0.3	–	–	x
Octane	111-65-9	500	2350	–	300	1450	375	1800	–	–	–
Oil mist, mineral	8012-95-1	–	5	–	–	5	–	–	–	–	–
Osmium tetroxide (as Os)	20816-12-0	–	0.002	–	–	0.002	–	0.006	–	–	–
Oxalic acid	144-62-7	–	1	–	–	1	–	2	–	–	–
Oxygen difluoride	7783-41-7	0.05	0.1	–	–	–	–	–	0.0	0	–
									5	.
										1
Ozone	10028-15-6	0.1	0.2	–	0.1	0.2	0.3	0.6	–	–	–
Paraffin wax fume	8002-74-2	–	–	–	–	2	–	–	–	–	–
Paraquat, respirable dust	1910-42-5 2074-50-2 4685-14-7	–	0.5	x	–	0.1	–	–	–	–	x
Parathion	56-38-2	–	0.1	x	–	0.1	–	–	–	–	x
Particulates	–	–	15	–	–	5 15	–	–	–	–	–
not otherwise
regulated,	–
RESPIRABLE Total	–	–	5	–	–	15 5	–	–	–	–	–
dust
TOTAL DUST
Respirable fraction
Pentaborane	19624-22-7	0.005	0.01	–	0.005	0.01	0.015	0.03	–	–	–
Pentachloronaphthalene	1321-64-8	–	0.5	x	–	0.5	–	–	–	–	x
Pentachlorophenol	87-86-5	–	0.5	x	–	0.5	–	–	–	–	x

Pentaerythritol,	115-77-5	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Pentane	109-66-0	1000	2950	–	600	1800	750	2250	–	–	–
2-Pentanone (Methyl propyl ketone)	107-87-9	200	700	–	200	700	250	875	–	–	–
Perchloroethylene   (Tetrachloroethylene)	127-18-4	See table G-2			25	170	–	–	–	–	–
Perchloromethyl mercaptan	594-42-3	0.1	0.8	–	0.1	0.8	–	–	–	–	–
Perchloryl fluoride	7616-94-6	3	13.5	–	3	14	6	28	–	–	–
Perlite	93763-70-3	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Petroleum distillates (Naphtha) (RUBBER SOLVENT)		500	2000	–	400	1600	–	–	–	–	–
Phenol	108-95-2	5	19	x	5	19	–	–	–	–	x
Phenothiazine	92-84-2	–	–	–	–	5	–	–	–	–	x
p-Phenylenediamine	106-50-3	–	0.1	x	–	0.1	–	–	–	–	x
Phenyl ether, vapor	101-84-8	1	7	–	1	7	–	–	–	–	–
Phenyl ether-biphenyl mixture, vapor	–	1	7	–	1	7	–	–	–	–	–
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)	122-60-1	10	60	–	1	6	–	–	–	–	–
Phenylhydrazine	100-63-0	5	22	x	5	20	10	45	–	–	x
Phenyl mercaptan	108-98-5	–	–	–	0.5	2	–	–	–	–	–
Phenylphosphine	638-21-1	–	–	–	–	–	–	–	0.0	0	–
									5	.
										2
										5
Phorate	298-02-2	–	–	–	–	0.05	–	0.2	–	–	x
Phosdrin (MevinphosR)	7786-34-7	–	0.1	x	–	0.1	–	0.3	–	–	x
Phosgene (Carbonyl chloride)	75-44-5	0.1	0.4	–	0.1	0.4	–	–	–	–	–
Phosphine	7803-51-2	0.3	0.4	–	0.3	0.4	1	1	–	–	–
Phosphoric acid	7664-38-2	–	1	–	–	1	–	3	–	–	–
Phosphorus (yellow)	7723-14-0	–	0.1	–	–	0.1	–	–	–	–	–

Phosphorus oxychloride	10025-87-3	–	–	–	0.1	0.6	–	–	–	–	–
Phosphorus pentachloride	10026-13-8	–	1	–	–	1	–	–	–	–	–
Phosphorus pentasulfide	1314-80-3	–	1	–	–	1	–	3	–	–	–
Phosphorus trichloride	7719-12-2	0.5	3	–	0.2	1.5	0.5	3	–	–	–
Phthalic anhydride	85-44-9	2	12	–	1	6	–	–	–	–	–
m-Phthalodinitrile	626-17-5	–	–	–	–	5	–	–	–	–	–
Picloram,	1918-02-1	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Picric acid	88-89-1	–	0.1	x	–	0.1	–	–	–	–	x
Piperazine dihydrochloride	142-64-3	–	–	–	–	5	–	–	–	–	–
Pindone (2-Pivalyl-1,3- indandione)	83-26-1	–	0.1	–	–	0.1	–	–	–	–	–
Plaster of Paris,	26499-65-0	–	15	–	–	5 15	–	–	–	–	–
(CALCIUM SULFATE)
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Platinum (as Pt)	7440-06-4	–	–	–	–	1	–	–	–	–	–
Metal
Soluble salts		–	0.002	–	–	0.002	–	–	–	–	–
Portland cement,	65997-15-1	See table G-3			–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		See table G-3			–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Potassium hydroxide	1310-58-3	–	–	–	–	–	–	–	–	2	–
Propane	74-98-6	1000	1800	–	1000	1800	–	–	–	–	–
Propargyl alcohol	107-19-7	–	–	–	1	2	–	–	–	–	x
beta-Propriolactone; see O.H. rule 2301(14)F	57-57-8
Propionic acid	79-09-4	–	–	–	10	30	–	–	–	–	–
Propoxur (Baygon)	114-26-1	–	–	–	–	0.5	–	–	–	–	–
n-Propyl acetate	109-60-4	200	840	–	200	840	250	1050	–	–	–
n-Propyl alcohol	71-23-8	200	500	–	200	500	250	625	–	–	–
n-Propyl nitrate	627-13-4	25	110	–	25	105	40	170	–	–	–
Propylene dichloride	78-87-5	75	350	–	75	350	110	510	–	–	–
Propylene glycol	6423-43-4	–	–	–	0.05	0.3	–	–	–	–	–

dinitrate
Propylene glycol monomethyl ether	107-98-2	–	–	–	100	360	150	540	–	–	–
Propylene imine	75-55-8	2	5	x	2	5	–	–	–	–	x
Propylene oxide	75-56-9	100	240	–	20	50	–	–	–	–	–
Propyne; see Methyl acetylene
Pyrethrum	8003-34-7	–	5	–	–	5	–	–	–	–	–
Pyridine	110-86-1	5	15	–	5	15	–	–	–	–	–
Quinone	106-51-4	0.1	0.4	–	0.1	0.4	–	–	–	–	–
Resorcinol	108-46-3	–	–	–	10	45	20	90	–	–	–
Rhodium,	7440-16-6	–	0.1	–	–	0.1	–	–	–	–	–
INSOLUBLE COMPOUNDS
(AS RH)		–	0.1	–	–	0.1	–	–	–	–	–
Metal fume (as Rh)
Insoluble compounds		–	0.001	–	–	0.001	–	–	–	–	–
(as Rh)
Soluble compounds
(as Rh)
Ronnel	299-84-3	–	15	–	–	10	–	–	–	–	–
Rosin core solder pyrolysis products, as formaldehyde	–	–	–	–	–	0.1	–	–	–	–	–
Rotenone	83-79-4	–	5	–	–	5	–	–	–	–	–
Rouge,	–	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Selenium compounds (as Se)	7782-49-2	–	0.2	–	–	0.2	–	–	–	–	–
Selenium hexafluoride (as Se)	7783-79-1	0.05	0.4	–	0.05	0.4	–	–	–	–	–
Silica, amorphous, precipitated and gel	112926-00-8	See table G-3			–	6	–	–	–	–	–
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica	61790-53-2	See table G-3			–	6	–	–	–	–	–
Silica, crystalline cristobalite (as quartz) respirable dust	14464-46-1	See table G-3			–	0.05	–	–	–	–	–
Silica, crystalline

quartz (as quartz), respirable dust

14808-60-7

See table G-3

–

0.1

–

–

–

–

–

SILICA, CRYSTALLINE TRIDYMITE, RESPIRABLE DUST

15468-32-3

–

0.05

–

–

–

–

–

Silica, crystalline tripoli (as quartz), respirable dust

1317-95-9

See table G-3

–

0.1

–

–

–

–

–

Silica, crystalline tridymite   (as quartz), respirable dust

15468-32-3

See table G-3

–

-

–

–

–

–

–

Silica, fused, respirable dust

60676-86-0

See table G-3

–

0.1

–

–

–

–

–

Silicates (less than 1% crystalline silica

Mica (respirable dust)

12001-26-2

See table G-3

–

3

–

–

–

–

–

Soapstone, total dust

–

See table G-3

–

6

–

–

–

–

–

Soapstone, respirable dust

–

See table G-3

–

3

–

–

–

–

–

Talc (containing asbestos); use asbestos limit

–

See table G-3

R 325.51311 et seq., Asbestos for General Industry

Talc (containing no asbestos), respirable dust

14807-96-6

See table G-3

–

2

–

–

–

–

–

Tremolite

See table G-3

R 325.51311 et seq., Asbestos for General Industry

Silicon, RESPIRABLE Total dust TOTAL DUST Respirable fraction

7440-21-3

– –

15 5

– –

– –

5 10 10 5

– –

– –

– –

– –

– –

Silicon carbide, RESPIRABLE Total dust TOTAL DUST

409-21-2

– –

15 5

– –

– –

5 10 10 5

– –

– –

– –

– –

– –

Respirable fraction
Silicon tetrahydride	7803-62-5	–	–	–	5	7	–	–	–	–	–
Silver, metal and soluble compounds (as Ag)	7440-22-4	–	0.01	–	–	0.01	–	–	–	–	–
Soapstone; see Silicates
Sodium azide	26628-22-8	– –	– –	– –	– –	– –	– –	– –	0.1 –	– 0 . 3	x x
(as HN3) (as NaN3)
Sodium bisulfite	7631-90-5	–	–	–	–	5	–	–	–	–	–
Sodium fluoroacetate	62-74-8	–	0.05	x	–	0.05	–	0.15	–	–	x
Sodium hydroxide	1310-73-2	–	2	–	–	–	–	–	–	2	–
Sodium metabisulfite	7681-57-4	–	–	–	–	5	–	–	–	–	–
Starch,	9005-25-8	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Stibine	7803-52-3	0.1	0.5	–	0.1	0.5	–	–	–	–	–
Stoddard solvent	8052-41-3	500	2900	–	100	525	–	–	–	–	–
Strychnine	57-24-9	–	0.15	–	–	0.15	–	–	–	–	–
Styrene	100-42-5	See table G-2			50	215	100	425	–	–	–
Subtilisins (Proteolytic enzymes)	9014-01-1	–	–	–	–	–	–	0.00006 (60 min.)	–	–	–
Sucrose,	57-50-1	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Sulfur dioxide	7446-09-5	5	13	–	2	5	5	10	–	–	–
Sulfur hexafluoride	2551-62-4	1000	6000	–	1000	6000	–	–	–	–	–
Sulfuric acid	7664-93-9	–	1	–	–	1	–	–	–	–	–
Sulfur monochloride	10025-67-9	1	6	–	–	–	–	–	1	6	–
Sulfur pentafluoride	5714-22-7	0.025	0.25	–	–	–	–	–	0.0	0	–
									1	.
										1
Sulfur tetrafluoride	7783-60-0	–	–	–	–	–	–	–	0.1	0 . 4	–
Sulfuryl fluoride	2699-79-8	5	20	–	5	20	10	40	–	–	–
Sulprofos	35400-43-2	–	–	–	–	1	–	–	–	–	–
SystoxR; see Demeton

2,4,5-T (2,4,5- TRICHLOROPHENOXYACETIC ACID)	93-76-5	–	10	–	–	10	–	–	–	–	–
Talc; see Silicates
Tantalum, metal and oxide dust	7440-25-7	–	5	–	–	5	–	–	–	–	–
TEDP (Sulfotep)	3689-24-5	–	0.2	x	–	0.2	–	–	–	–	x
Tellurium and compounds (as Te)	13494-80-9	–	0.1	–	–	0.1	–	–	–	–	–
Tellurium hexafluoride (as Te)	7783-80-4	0.02	0.2	–	0.02	0.2	–	–	–	–	–
Temephos,	3383-96-8	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
TEPP	107-49-3	–	0.05	x	–	0.05	–	–	–	–	x
Terphenyls	26140-60-3	(C)1	(C)9	–	–	–	–	–	0.5	5	–
1,1,1,2-Tetrachloro-2, 2-difluoro-ethane	76-11-9	500	4170	–	500	4170	–	–	–	–	–
1,1,2,2-Tetrachloro-1, 2-difluoro-ethane	76-12-0	500	4170	–	500	4170	–	–	–	–	–
1,1,2,2- Tetrachloroethane	79-34-5	5	35	x	1	7	–	–	–	–	x
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane; see Carbon tetrachloride
Tetrachloronaphthalene	1335-88-2	–	2	x	–	2	–	–	–	–	x
Tetraethyl lead (as Pb)	78-00-2	–	0.075	x	–	0.075	–	–	–	–	x
Tetrahydrofuran	109-99-9	200	590	–	200	590	250	735	–	–	–
Tetramethyl lead (as Pb)	75-74-1	–	0.075	x	–	0.075	–	–	–	–	x
Tetramethyl succinonitrile	3333-52-6	0.5	3	x	0.5	3	–	–	–	–	x
Tetranitromethane	509-14-8	1	8	–	1	8	–	–	–	–	–
Tetrasodium pyrophosphate	7722-88-5	–	–	–	–	5	–	–	–	–	–
Tetryl (2,4,6- Trinitro-   phenylmethylnitramine)	479-45-8	–	1.5	x	–	1.5	–	–	–	–	x
Thallium, soluble

compounds (as Tl)	7440-28-0	–	0.1	x	–	0.1	–	–	–	–	x
4,4'-Thiobis	96-69-5	–	15	–	–	5 10	–	–	–	–	–
(6-tert-butyl-m-
cresol)
RESPIRABLE Total		–	5	–	–	10 5	–	–	–	–	–
dust
TOTAL DUST
Respirable fraction
Thioglycolic acid	68-11-1	–	–	–	1	4	–	–	–	–	x
Thionyl chloride	7719-09-7	–	–	–	–	–	–	–	1	5	–
Thiram	137-26-8	–	5	–	–	5	–	–	–	–	–
Tin, Inorganic compounds (except oxides) (as Sn) Organic compounds (as Sn) Oxides (as Sn)	7440-31-5   7440-31-5 21651-19-4	–   – –	2   0.1 -	–   – –	–   – –	2   0.1 2	–   – –	–   – –	–   – –	–   – –	–   x –
Titanium dioxide Total dust	13463-67-7	–	15	–	–	10	–	–	–	–	–
Toluene	108-88-3	See table G-2			100	375	150	560	–	–	–
Toluene-2,4- diisocyanate (TDI)	584-84-9	(C)0.02	(C)0.14	–	0.005	0.04	0.02	0.15	–	–	–
m-Toluidine	108-44-1	–	–	–	2	9	–	–	–	–	x
0-Toluidine	95-53-4	5	22	x	5	22	–	–	–	–	x
p-Toluidine	106-49-0	–	–	–	2	9	–	–	–	–	x
Toxaphene; see Chlorinated camphene
Tremolite; see Silicates
Tributyl phosphate	126-73-8	–	5	–	0.2	2.5	–	–	–	–	–
Trichloroacetic acid	76-03-9	–	–	–	1	7	–	–	–	–	–
1,2,4-Trichlorobenzene	120-82-1	–	–	–	–	–	–	–	5	4 0	–
1,1,1-Trichloroethane; see Methyl chloroform
1,1,2-Trichloroethane	79-00-5	10	45	x	10	45	–	–	–	–	x
Trichloroethylene	79-01-6	See table G-2			50	270	200	1080	–	–	–
Trichloromethane; see Chloroform
Trichloronaphthalene	1321-65-9	–	5	x	–	5	–	–	–	–	x
1,2,3-Trichloropropane	96-18-4	50	300	–	10	60	–	–	–	–	–
1,1,2-Trichloro-1,2,

2-trifluoroethane	76-13-1	1000	7600	–	1000	7600	1250	9500	–	–	–
Triethylamine	121-44-8	25	100	–	10	40	15	60	–	–	–
Trifluorobromomethane	75-63-8	1000	6100	–	1000	6100	–	–	–	–	–
Trimellitic anhydride	552-30-7	–	–	–	0.005	0.04	–	–	–	–	–
Trimethylamine	75-50-3	–	–	–	10	24	15	36	–	–	–
Trimethyl benzene	25551-13-7	25	125	–	25	125	–	–	–	–	–
Trimethyl phosphite	121-45-9	–	–	–	2	10	–	–	–	–	–
2,4,6-Trinitrophenol; see Picric acid
2,4,6-   Trinitrophenylmethylni tramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)	118-96-7	–	1.5	x	–	0.5	–	–	–	–	x
Triorthocresyl phosphate	78-30-8	–	0.1	–	–	0.1	–	–	–	–	x
Triphenyl amine	603-34-9	–	–	–	–	5	–	–	–	–	–
Triphenyl phosphate	115-86-6	–	3	–	–	3	–	–	–	–	–
Tungsten	7440-33-7	–	5	–	–	5	–	10	–	–	–
Insoluble compounds
(as W)		–	1	–	–	1	–	3	–
Soluble compounds
(as W)
Turpentine	8006-64-2	100	560	–	100	560	–	–	–	–	–
Uranium (as U)	7440-61-1	–	0.05	–	–	0.2 0.05	–	0.6	–	–	–
INsoluble compounds
InSoluble compounds		–	0.25	–	–	0.05 0.2	–	- 0.6	–	–	–
n-Valeraldehyde	110-62-3	–	–	–	50	175	–	–	–	–	–
Vanadium PENTOXIDE (as	1314-62-1	–	(C)0.5	–	–	0.05	–	–	–	–	–
V2O5)
FUME Respirable dust		–	(C)0.1	–	–	0.05	–	–	–	–	–
(as V2O5)
RESPIRABLE DUST Fume
(as V2O5)
Vegetable oil mistS	–	–	15	–	–	5 15	–	–	–	–	–
RESPIRABLE MIST
Total dust		–	5	–	–	15 5	–	–	–	–	–
TOTAL MIST
Respirable fraction
Vinyl acetate	108-05-4	–	–	–	10	30	20	60	–	–	–
Vinyl benzene; see Styrene
Vinyl bromide	593-60-2	–	–	–	5	20	–	–	–	–	–
Vinyl chloride SEE 325.51401 ET	75-01-4				1	2.5	5	12.8

SEQ.F see O.H. rule 2260
Vinyl cyanide; see Acrylonitrile
Vinyl cyclohexene dioxide	106-87-6	–	–	–	10	60	–	–	–	–	x
Vinylidene chloride (1,1- Dichloroethylene)	75-35-4	–	–	–	1	4	–	–	–	–	–
Vinyl toluene	25013-15-4	100	480	–	100	480	–	–	–	–	–
VM & P Naphtha	8032-32-4	–	–	–	300	1350	400	1800	–	–	–
Warfarin	81-81-2	–	0.1	–	–	0.1	–	–	–	–	–
Welding fumes (Total particulate)*	–	–	–	–	–	5	–	–	–	–	–
Wood dust, All soft and hard woods (except Western red cedar)	–	–	–	–	–	5	–	10	–	–	–
Wood dust, Western red cedar	–	–	–	–	–	2.5	–	–	–	–	–
Xylenes (o-,m-,p- isomers) (DIMETHYL BENZENE)	1330-20-7	100	435	–	100	435	150	655	–	–	–
m-Xylene alpha, alpha’-diamine	1477-55-0	–	–	–	–	–	–	–	–	0 . 1	x
Xylidine	1300-73-8	5	25	x	2	10	–	–	–	–	x
Yttrium	7440-65-5	–	1	–	–	1	–	–	–	–	–
Zinc chloride fume	7646-85-7	–	1	–	–	1	–	2	–	–	–
Zinc chromate (as CrO3)	Varies with compound	See table G-2			–	–	–	–	–	0 . 1	–
Zinc oxide fume	1314-13-2	–	5	–	–	5	–	10	–	–	–
Zinc oxide,	1314-13-2	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Zinc stearate	557-05-1	–	15	–	–	5 10	–	–	–	–	–
RESPIRABLE Total
dust		–	5	–	–	10 5	–	–	–	–	–
TOTAL DUST
Respirable fraction
Zirconium compounds (as Zr)	7440-67-7	–	5	–	–	5	–	10	–	–	–

 

*      The transitional PELs are 8-hour TWAs unless otherwise noted; a (C) designation denotes a ceiling limit.

**   Unless otherwise noted, employers in general industry may use any combination of controls to achieve these limits as noted in R 325.51106 for a period of not more than 4 years from the effective date of these rules.

***  As determined from breathing-zone air samples.

**  PARTS PER BILLION

E A  The CAS number is for information only.  Enforcement is based on the substance name.     For an entry covering more than 1 metal compound measured as the metal, the CAS number for the metal is given - not the CAS number for the individual compounds.

A  B  Parts of vapor or gas per million parts of contaminated air by volume at 25°C and 760 torr.

B  C  Approximate milligrams of substance per cubic meter of air.

C  D  Duration is for 15 minutes, unless otherwise noted.

D  E  The final benzene standard in R 325.77101 et seq. applies to all occupational exposures to benzene, except some subsegments of industry where exposures are consistently under the action level.                        These subsegments include the distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid    mixtures.  For the excepted subsegments, the benzene limits in table G-2 apply.

F  CAUTION--THIS RULE CONTAINS EXTENSIVE REQUIREMENTS FOR EXPOSURE TO THESE SUBSTANCES.

 

TABLE G-2

EXPOSURE LIMITS FOR AIR CONTAMINATES

SUBSTANCE Material	8-hour, time weighted average	Acceptable ceiling concentration	Acceptable maximum peak above the acceptable ceiling concentration for an 8-hour WORKshift.
			Concentration	Maximum duration
S Benzene	10 ppm	25 ppm	50 ppm	10 minutes
Beryllium and beryllium compounds	2 _g/m3	5 _g/m3	25 _g/m3	30 minutes
Cadmium fume	0.1 mg/m3	0.3 mg/m3
Cadmium dust	0.2 mg/m3	0.6 mg/m3
S Carbon disulfate	20 p.p.m.	30 p.p.m.	100 p.p.m.	30 minutes
S Carbon Tetrachloride	10 p.p.m.	25 p.p.m.	200 p.p.m.	5 minutes in any 4 hours
Chromic acid and chromates	0.1 mg/m3
S Ethylene dibromide	20 ppm	30 ppm	50 ppm	5 minutes
Ethylene dichloride	50 p.p.m.	100 p.p.m.	200 p.p.m.	5 minutes in any 3 hours
Formaldehyde	3 p.p.m.	5 p.p.m.	10 p.p.m.	30 minutes
Fluoride as dust	2.5 mg/m3
Hydrogen fluoride	3 p.p.m.
Hydrogen sulfide	10 p.p.m.(a)	20 p.p.m.	50 p.p.m.	10 minutes once only if no other measurable exposure occurs
Methyl chloride	100 p.p.m.	200 p.p.m.	300 p.p.m.	5 minutes in any 3 hours
Methylene Chloride	500 p.p.m.	1,000 p.p.m.	2,000 p.p.m.	5 minutes in any 2 hours
S Mercury	0.1 mg/m3
S Mercury organo (alkyl)	0.01 mg/m3	0.04 mg/m3

Styrene	100 p.p.m.	200 p.p.m.	600 p.p.m.	5 minutes in any 3 hours
Tetrachloroethylene	100 p.p.m.	200 p.p.m.	300 p.p.m.	5 minutes in any 3 hours
Trichloroethylene	100 p.p.m.	200 p.p.m.	300 p.p.m.	5 minutes in any 2 hours
Toluene	200 p.p.m.	300 p.p.m.	500 p.p.m.	10 minutes

Note:  S above signifies that skin contact shall not be allowed.

 

TABLE G-3–MINERAL DUSTS

Substance			mppcf(a)	mg/m3
Silica:
	Crystalline:
		Quartz (respirable)	250(b) %SiO2+5	10 mg/m3(c) %SiO2+2
		Quartz (total dust)		30 mg/m3 %SiO2+2
		Crisotbalite: Use ½ the value calculated from the count or mass formulae for quartz.
		Tridymite: Use ½ the value calculated from the formulae for quartz.
	Amorphous, including natural diatomaceous earth		20
Silicates (less than 1% crystalline silica):
		Asbestos	See Rule 2205
		Mica	20
		Soapstone	20
		Talc (non-asbestos-form)	20(d)
		Talc (fibrous)	Use asbestos limit
		Tremolite (see talc, fibrous)
		Portland cement	50
Graphite (natural)			15
Coal dust (respirable fraction less than 5% SiO (E) 2  Coal dust (respirable fraction more than 5% SiO (e) 2				2.4 mg/m3 or  10 mg/m3 %SiO2+2
Inert or Nuisance Dust(f)    Respirable fraction    Total dust			15 5	5 mg/m3  15 mg/m3

Note: Conversion factors – mppcf x 35.3 = million particles per cubic meter = particles per c.c.

a  Millions of particles per cubic foot of air, based on impinger samples counted by light field techniques.

b  The percentage of crystalline silica in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.

c  Both concentration and percent quartz for the application of this limit are to be determined from the fraction passing a size selector with the following characteristics:

Aerodynamic diameter (unit density sphere)                       Percent passing selector 2                                         90

d  Containing <1% quartz; if> 1% quartz, use quartz limit.

f  The following are some examples of inert or nuisance particles when toxic impurities are not present; for example, quartz less than 1%.

       Alundum (Al2O3)                 Gypsum                         Pentaerythritol Calcium carbonate                      Vegetable oil mists                      Plaster of Paris Cellulose             (except castor, cashew                 Rouge

       Corundum (Al2O3)                          oils)                         Starch Emery                      Limestone                        Sucrose