12 PROPOSED ADMINISTRATIVE RULES

 

DEPARTMENT OF CONSUMER AND INDUSTRY SERVICES LICENSING AND REGULATORY AFFAIRS

 

DIRECTOR’S OFFICE

 

OCCUPATIONAL HEALTH STANDARDS—AIR CONTAMINANTS

 

Proposed Draft August 15, 2012 Filed with the Secretary of State on

These rules become effective immediately upon filing with the Secretary of State unless adopted under section 33, 44, or 45a(6) of 1969 PA 306. Rules adopted under these sections become effective 7 days after filing with the Secretary of State.

 

(By authority conferred on the director of the department of licensing and regulatory affairs by sections 14 and 24 of 1974 PA 154, MCL 408.1014 and 408.1024; and Executive Reorganization Orders Nos.

1996-1, 1996-2, 2003-1, 2008-4, and 2011-4, MCL 330.3101, 445.2001, 445.2011, 445.2025 and

445.2030)

 

R 325.51101, R 325.51105, and R 325.51108 of the Michigan Administrative Code are amended and R 325.51101a is added to the Michigan Administrative Code as follows:

 

PART 301. AIR CONTAMINANTS FOR GENERAL INDUSTRY

 

R 325.51101 Scope; applicability; Applicability; replacement of O.H. rules. Rule 1. (1) These rules do not apply to the following types of employment:

(a)    Agriculture. (b) Construction.

(c)   (b) Domestic.

(d)  (c) Mining.

(d) Construction.

Exposure to air contaminants in construction work is covered by occupational health standard part 601 “Air Contaminants for Construction,” R 325.60151 to R 325.60161.

(2) These rules replace O.H. rules 2101, 2102, 2103, and 2104.

 

R 325.51101a Availability of referenced standards.

Rule 1a. The following Michigan occupational safety and health standards are referenced in these rules. Up to 5 copies of these standards may be obtained at no charge from the Michigan Department of Licensing and Regulatory Affairs, MIOSHA Standards Section, 7150 Harris Drive,

P.O. Box 30643, Lansing, Michigan, 48909-8143 or via the internet at website: www.michigan.gov/mioshastandards. For quantities greater than 5, the cost, as of the time of adoption of these rules, is 4 cents per page.

(a)  Occupational health standard part 302 “Vinyl Chloride,” R 325.51401 to R 325.51414.

 

 

(b)   Occupational health standard part 303 “Methylenedianiline,” R 325.50051 to R 325.50076.

(c)   Occupational health standard part 304 “Ethylene oxide,” R 325.51151 to R 325.51177.

(d)  Occupational health standard part 305 “Asbestos for General Industry,” R 325.51311 to R 325.51312.

(e)   Occupational health standard part 306 “Formaldehyde,” R 325.51451 to R 325.51477.

(f)  Occupational health standard part 307 “Acrylonitrile,” R 325.51501 to R 325.51527.

(g)   Occupational health standard part 308 “Inorganic Arsenic,” R 325.51601 to R 325.51628.

(h)   Occupational health standard part 309 “Cadmium,” R 325.51851 to R 325.51886.

(i)   Occupational health standard part 310 “Lead,” R 325.51901 to R 325.51958.

(j)   Occupational health standard part 311 “Benzene,” R 325.77101 to R 325.77115.

(k)   Occupational health standard part 312 “1,3-Butadiene,” R 325.50091 to R 325.50092.

(l)   Occupational health standard part 313 “Methylene Chloride,” R 325.51651 to R 325.51652.

(m)   Occupational health standard part 314 “Coke Oven Emissions,” R 325.50101 to R 325.50136.

(n)  Occupational health standard part 315 “Chromium (VI) in General Industry,” R 325.50141 to R 325.50143.

(o)   Occupational health standard part 350 “Carcinogens,” R 325.35001 to R 325.35011.

(p)  Occupational health standard part 451 “Respiratory Protection,” R 325.60051 to R 325.60052.

(q)  Occupational health standard part 601 “Air Contaminants for Construction,” R 325.60151 to R 325.60161.

 

R 325.51105 Methods of compliance.

Rule 5. To achieve compliance with the provisions of R 325.51103 and R 325.51104, administrative or engineering controls shall first be determined and implemented when feasible. If such controls are not feasible to achieve full compliance, then personal protective equipment or any other protective measures shall be used to keep the employee’s exposure to air contaminants within the exposure limits prescribed in these rules. Any equipment and technical measures used for this purpose shall be approved for each particular use by a competent industrial hygienist or other technically qualified person. When a respirator is used, its use shall comply with the provisions of occupational health standard part 451 “Respiratory Protection,” R 325.60051 et seq. respiratory protection, R 325.60051 to R 325.60052 Part 451 .

 

R 325.51108 Tables.

Rule 8. Tables G-1-A and G-2 read as follows:

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Abate			–	15	–	–	–	–	–
Acetaldehyde		75-07-0	100	180	150	270	–	–	–
Acetic acid		64-19-7	10	25	–	–	–	–	–
Acetic anhydride		108-24-7	–	–	–	–	5	20	–
Acetone		67-64-1	750	1800	1000	2400	–	–	–
Acetonitrile		75-05-8	40	70	60	105	–	–	–
2-Acetylaminofluorine; see O.H. rule 2301(1) OH Part 350, R 325.35001 to R 325.35011F		53-96-3
Acetylene dichloride; see 1,2-Dichloroethylene
Acetylene tetrabromide		79-27-6	1	14	–	–	–	–	–
Acetylsalicylic acid (Aspirin)		50-78-2	–	5	–	–	–	–	–
Acrolein		107-02-8	0.1	0.25	0.3	0.8	–	–	–
Acrylamide		79-06-1	–	0.03	–	–	–	–	x
Acrylic acid		79-10-7	10	30	–	–	–	–	x
Acrylonitrile; see OH Part 307, R 325.51501 to R 325.51527F et seq.F		107-13-1	2	4.34	10	21.7
Aldrin		309-00-2	–	0.25	–	–	–	–	x
Allyl alcohol		107-18-6	2	5	4	10	–	–	x
Allyl chloride		107-05-1	1	3	2	6	–	–	–
Allyl glycidyl ether (AGE)		106-92-3	5	22	10	44	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Allyl propyl disulfide		2179-59-1	2	12	3	18	–	–	–
α Alumina (aluminum oxide) Respirable fraction Total dust		1344-28-1	– –	5 10	– –	– –	– –	– –	– –
Aluminum (as Al) Alkyls Metal Respirable dust Total dust Pyro powders Soluble salts Welding fumes*		7429-90-5	– – – – – – –	2   5 15 5 2 5	– – – – – – –	– – – – – – –	– – – – – – –	– – – – – – –	– – – – – – –
4-Aminodiphenyl; see O.H. rule 2301(2) OH Part 350, R 325.35001 to R 325.35011F		92-67-1
2-Aminoethanol; see Ethanolamine
2-Aminopyridine		504-29-0	0.5	2	–	–	–	–	–
Amitrole		61-82-5	–	0.2	–	–	–	–	–
Ammonia		7664-41-7	–	–	35	27 24	–	–	–
Ammonium chloride fume		12125-02- 9	–	10	–	20	–	–	–
Ammonium sulfamate Respirable dust Total dust		7773-06-0	– –	5 10	– –	– –	– –	– –	– –
n-Amyl acetate		628-63-7	100	525	–	–	–	–	–
sec-Amyl acetate		626-38-0	125	650	–	–	–	–	–
Aniline and homologues		62-53-3	2	8	–	–	–	–	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Anisidine (o- and p-isomers)		29191-52- 4	–	0.5	–	–	–	–	x
Antimony and compounds (as Sb)		7440-36-0	–	0.5	–	–	–	–	–
ANTU (alpha-naphthylthiourea)		86-88-4	–	0.3	–	–	–	–	–
Arsenic, organic compounds (as As)		7440-38-2	–	0.5	–	–	–	–	–
Arsenic, inorganic compounds (as As); see OH Part 308, R 325.51601 to R 325.51628F et seq.F		7440-38-2		0.01
Arsine		7784-42-1	0.05	0.2	–	–	–	–	–
			TWA		STEL
Asbestos; see OH Part 305, R 325.51311 to R 325.51312F et seq.F		Varies	0.1f/cc		–
			ppmB	mg/m3C	ppmB	mg/m3C
Atrazine		1912-24-9	–	5	–	–	–	–	–
Azinphos-methyl		86-50-0	–	0.2	–	–	–	–	x
Barium, soluble compounds (as Ba)		7440-39-3	–	0.5	–	–	–	–	–
Barium sulfate Respirable dust Total dust		7727-43-7	– –	5 10	– –	– –	– –	– –	– –
Benomyl Respirable dust Total dust		17804-35- 2	– –	5 10	– –	– –	– –	– –	– –

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
BenzeneE; see OH Part 311, R 325.77101 to R 325.77115F 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
Benzidine; see O.H. rule 2301(3) OH Part 350, R 325.35001 to R 325.35011F		92-87-5
p-Benzoquinone; see Quinone
Benzo(a)pyrene; see Coal tar pitch volatiles
Benzoyl peroxide		94-36-0	–	5	–	–	–	–	–
Benzyl chloride		100-44-7	1	5	–	–	–	–	–
Beryllium and beryllium compounds (as Be)		7440-41-7	See table G-2
Biphenyl; see Diphenyl
Bismuth telluride, Undoped Respirable dust Total dust		1304-82-1	– –	5 15	– –	– –	– –	– –	– –
Bismuth telluride, Se-doped			–	5	–	–	–	–	–
Borates, Tetra, Sodium Salts Anhydrous Decahydrate Pentahydrate		1330-43-4 1303-96-4 12179-04- 3	– – –	10 10 10	– – –	– – –	– – –	– – –	– – –
Boron oxide, Total dust		1303-86-2	–	10	–	–	–	–	–
Boron tribromide		10294-33- 4	–	–	–	–	1	10	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Boron trifluoride		7637-07-2	–	–	–	–	1	3	–
Bromacil		314-40-9	1	10	–	–	–	–	–
Bromine		7726-95-6	0.1	0.7	0.3	2	–	–	–
Bromine pentafluoride		7789-30-2	0.1	0.7	–	–	–	–	–
Bromoform		75-25-2	0.5	5	–	–	–	–	–
1,3-Butadiene; see OH Part 312, R 325.50091 to R 325.50092F et seq.F		106-99-0	1	2.2	5	11.1	–	–	–
Butane		106-97-8	800	1900	–	–	–	–	–
Butanethiol; see Butyl mercaptan
2-Butanone (Methyl ethyl ketone)		78-93-3	200	590	300	885	–	–	–
2-Butoxyethanol		111-76-2	25	120	–	–	–	–	x
n-Butyl acetate		123-86-4	150	710	200	950	–	–	–
sec-Butyl acetate		105-46-4	200	950	–	–	–	–	–
tert-Butyl acetate		540-88-5	200	950	–	–	–	–	–
Butyl acrylate		141-32-2	10	55	–	–	–	–	–
n–Butyl alcohol (n-butanol)		71-36-3	–	–	–	–	50	150	x
sec-Butyl alcohol (sec-butanol)		78-92-2	100	305	–	–	–	–	–
tert-Butyl alcohol (tert-butanol)		75-65-0	100	300	150	450	–	–	–
Butylamine		109-73-9	–	–	–	–	5	15	x
tert-Butyl chromate (as CrO3) (as Cr+6); see OH Part 315, R 325.50141 to R 325.50143F, G		1189-85-1	–	0.005 (5 μg/m3)	–	–	–	0.1 –	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
n-Butyl glycidyl ether (BGE)		2426-08-6	25	135	–	–	–	–	–
n-Butyl lactate		138-22-7	5	25	–	–	–	–	–
Butyl mercaptan		109-79-5	0.5	1.5	–	–	–	–	–
o-sec-Butylphenol		89-72-5	5	30	–	–	–	–	x
p-tert-Butyltoluene		98-51-1	10	60	20	120	–	–	–
Cadmium; see OH Part 309, R 325.51851 to R 325.51886F et seq.F		7440-43-9	–	0.005	–	–	–	–	–
Calcium carbonate,		1317-65-3	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Calcium cyanamide		156-62-7	–	0.5	–	–	–	–	–
Calcium hydroxide		1305-62-0	–	5	–	–	–	–	–
Calcium oxide		1305-78-8	–	5	–	–	–	–	–
Calcium silicate,		1344-95-2	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Calcium sulfate,		7778-18-9	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Camphor, synthetic		76-22-2	–	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	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Carbaryl (SevinR)		63-25-2	–	5	–	–	–	–	–
Carbofuran (FuradanR)		1563-66-2	–	0.1	–	–	–	–	–
Carbon black		1333-86-4	–	3.5	–	–	–	–	–
Carbon dioxide		124-38-9	10,000	18,000	30,000	54,000	–	–	–
Carbon disulfide		75-15-0	4	12	12	36	–	–	x
Carbon monoxide		630-08-0	35	40	–	–	200	229	–
Carbon tetrabromide		558-13-4	0.1	1.4	0.3	4	–	–	–
Carbon tetrachloride (Tetrachloromethane)		56-23-5	2	12.6	–	–	–	–	x
Carbonyl fluoride		353-50-4	2	5	5	15	–	–	–
Catechol (Pyrocatechol)		120-80-9	5	20	–	–	–	–	x
Cellulose, Respirable dust Total dust		9004-34-6	– –	5 15	– –	– –	– –	– –	– –
Cesium hydroxide		21351-79- 1	–	2	–	–	–	–	–
Chlordane		57-74-9	–	0.5	–	–	–	–	x
Chlorinated camphene (Toxaphone)		8001-35-2	–	0.5	–	1	–	–	x
Chlorinated diphenyl oxide		55720-99- 5 or 31242-93- 0	–	0.5	–	–	–	–	–
Chlorine		7782-50-5	0.5	1.5	1	3	–	–	–
Chlorine dioxide		10049-04- 4	0.1	0.3	0.3	0.9	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Chlorine trifluoride		7790-91-2	–	–	–	–	0.1	0.4	–
Chloroacetaldehyde		107-20-0	–	–	–	–	1	3	–
2-Chloroacetophenone (Phenacyl chloride)		532-27-4	0.5	0.3	–	–	–	–	–
Chloroacetyl chloride		79-04-9	0.5	0.2	–	–	–	–	–
Chlorobenzene		108-90-7	75	350	–	–	–	–	–
o-Chlorobenzylidene malononitrile		2698-41-1	–	–	–	–	0.05	0.4	x
Chlorobromomethane		74-97-5	200	1050	–	–	–	–	–
2-Chloro-1,3-butadiene; see β- Chloroprene
Chlorodifluoromethane		75-45-6	1000	3500	–	–	–	–	–
Chlorodiphenyl (42% Chlorine) (PCB)		53469-21- 9	–	1	–	–	–	–	x
Chlorodiphenyl (54% Chlorine) (PCB)		11097-69- 1	–	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	2	9.78	–	–	–	–	–
bis (Chloromethyl) ether; see O.H. Rule 2301(4)F OH Part 350, R 325.35001 to R 325.35011F		542-88-1

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Chloromethyl methyl ether; see O.H. rule 2301(8) OH Part 350, R 325.35001 to R 325.35011F		107-30-2
1-Chloro-1-nitropropane		600-25-9	4	10	–	–	–	–	–
Chloropentafluoroethane		76-15-3	1000	6320	–	–	–	–	–
Chloropicrin		76-06-2	0.1	0.7	–	–	–	–	–
beta-Chloroprene		126-99-8	10	35	–	–	–	–	x
o-Chlorostyrene		2039-87-4	50	285	75	428	–	–	–
o-Chlorotoluene		95-49-8	50	250	–	–	–	–	–
2-Chloro-6-(trichloromethyl) pyridine,		1929-82-4	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Chlorpyrifos		2921-88-2	–	0.2	–	–	–	–	x
Chromic acid and chromates (as CrO3) (as Cr+6); see OH Part 315, R 325.50141 to R 325.50143F, G		Varies with compound	–	0.005 (5 μg/m3)	–	–	–	0.1  –	–
Chromium (II) compounds (as Cr)		7440-47-3	–	0.5	–	–	–	–	–
Chromium (III) compounds (as Cr)		7440-47-3	–	0.5	–	–	–	–	–
Chromium (VI) compounds; see OH Part 315, R 325.50141 to R 325.50143F, G		Varies with compoun d		(5 μg/m3)
Chromium metal (as Cr)		7440-47-3	–	1	–	–	–	–	–
Chrysene; see Coal tar pitch volatile

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Clopidol Respirable dust Total dust		2971-90-6	– –	5 15	– –	– –	– –	– –	– –
Coal dust (less than 5% SiO2) Respirable quartz dust		–	–	2	–	–	–	–	–
Coal dust (greater than or equal to 5% SiO2), Respirable dust		–	–	0.1	–	–	–	–	–
Coal tar pitch volatile (as benzene solubles) anthracene, BaP, phenanthrene, acridine, crysene, pyrene		65996-93- 2	–	0.2	–	–	–	–	–
Cobalt metal, dust, and fume (as Co)		7440-48-4	–	0.05	–	–	–	–	–
Cobalt carbonyl (as Co)		10210-68- 1	–	0.1	–	–	–	–	–
Cobalt hydrocarbonyl (as Co)		16842-03- 8	–	0.1	–	–	–	–	–
Coke oven emissions; see OH Part 314, R 325.50101 to R 325.50136F et seq.F		–	–	0.15 (150 μg/m3)	–	–	–	–	–
Copper, Dusts and mists (as Cu) Fume (as Cu)		7440-50-8	– –	1 0.1	– –	– –	– –	– –	– –
Cotton dust (raw)		–	–	1	–	–	–	–	–
Crag herbicide (Sesone) Total dust Respirable fraction		136-78-7	– –	10 5	– –	– –	– –	– –	– –
Cresol, all isomers		1319-77-3	5	22	–	–	–	–	x
Crotonaldehyde		123-73-9 4170-30-3	2	6	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Crufomate		299-86-5	–	5	–	–	–	–	–
Cumene		98-82-8	50	245	–	–	–	–	x
Cyanamide		420-04-2	–	2	–	–	–	–	–
Cyanides (as CN)		Varies with compound	–	5	–	–	–	–	x
Cyanogen		460-19-5	10	20	–	–	–	–	–
Cyanogen chloride		506-77-4	–	–	–	–	0.3	0.6	–
Cyclohexane		110-82-7	300	1050	–	–	–	–	–
Cyclohexanol		108-93-0	50	200	–	–	–	–	x
Cyclohexanone		108-94-1	25	100	–	–	–	–	x
Cyclohexene		110-83-8	300	1015	–	–	–	–	–
Cyclohexylamine		108-91-8	10	40	–	–	–	–	–
Cyclonite		121-82-4	–	1.5	–	–	–	–	x
Cyclopentadiene		542-92-7	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	0.15	0.9	–	–	x
Demeton (SystoxR)		8065-48-3	–	0.1	–	–	–	–	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)		123-42-2	50	240	–	–	–	–	–
1,2-Diaminoethane; see Ethylenediamine
Diazinon		333-41-5	–	0.1	–	–	–	–	x
Diazomethane		334-88-3	0.2	0.4	–	–	–	–	–
Diborane		19287-45- 7	0.1	0.1	–	–	–	–	–
2-N-Dibutylaminoethanol		102-81-8	2	14	–	–	–	–	–
Dibutyl phosphate		107-66-4	1	5	2	10	–	–	–
Dibutyl phthalate		84-74-2	–	5	–	–	–	–	–
Dichloroacetylene		7572-29-4	–	–	–	–	0.1	0.4	–
o-Dichlorobenzene		95-50-1	–	–	–	–	50	300	–
p-Dichlorobenzene		106-46-7	75	450	110	675	–	–	–
3,3'-Dichlorobenzidine; see O.H. rule 2301(5)F OH Part 350, R 325.35001 to R 325.35011F		91-94-1
Dichlorodifluoromethane		75-71-8	1000	4950	–	–	–	–	–
1,3-Dichloro-5,5-dimethyl hydantoin		118-52-5	–	0.2	–	0.4	–	–	–
Dichlorodiphenyltri-chloroethane (DDT)		50-29-3	–	1	–	–	–	–	x
1,1-Dichloroethane		75-34-3	100	400	–	–	–	–	–
1,2-Dichloroethylene		540-59-0	200	790	–	–	–	–	–
Dichloroethyl ether		111-44-4	5	30	10	60	–	–	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Dichlorofluoromethane		75-43-4	10	40	–	–	–	–	–
Dichloromethane; see Methylene chloride
1,1-Dichloro-1-nitroethane		594-72-9	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	–	–	–	–	–
Dichlorotetrafluoroethane		76-14-2	1000	7000	–	–	–	–	–
Dichlorvos (DDVP)		62-73-7	–	1	–	–	–	–	x
Dicrotophos		141-66-2	–	0.25	–	–	–	–	x
Dicyclopentadiene		77-73-6	5	30	–	–	–	–	–
Dicyclopentadienyl iron,		102-54-5	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Dieldrin		60-57-1	–	0.25	–	–	–	–	x
Diethanolamine		111-42-2	3	15	–	–	–	–	–
Diethylamine		109-89-7	10	30	25	75	–	–	–
2-Diethylaminoethanol		100-37-8	10	50	–	–	–	–	x
Diethylene triamine		111-40-0	1	4	–	–	–	–	x
Diethyl ether; see Ethyl ether
Diethyl ketone		96-22-0	200	705	–	–	–	–	–
Diethyl phthalate		84-66-2	–	5	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Difluorodibromomethane		75-61-6	100	860	–	–	–	–	–
Diglycidyl ether (DGE)		2238-07-5	0.1	0.5	–	–	–	–	–
Dihydroxybenzene; see Hydroquinone
Diisobutyl ketone		108-83-8	25	150	–	–	–	–	–
Diisopropylamine		108-18-9	5	20	–	–	–	–	x
4-Dimethylaminoazobenzene; see O.H. rule 2301(6)F OH Part 350, R 325.35001 to R 325.35011F		60-11-7
Dimethoxymethane; see Methylal
Dimethyl acetamide		127-19-5	10	35	–	–	–	–	x
Dimethylamine		124-40-3	10	18	–	–	–	–	–
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N-Dimethylaniline)		121-69-7	5	25	10	50	–	–	x
Dimethylbenzene; see Xylene
Dimethyl-1,2-dibromo-2,2- dichloroethyl phosphate		300-76-5	–	3	–	–	–	–	x
Dimethylformamide		68-12-2	10	30	–	–	–	–	x
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
1,1-Dimethylhydrazine		57-14-7	0.5	1	–	–	–	–	x
Dimethylphthalate		131-11-3	–	5	–	–	–	–	–
Dimethyl sulfate		77-78-1	0.1	0.5	–	–	–	–	x
Dinitolmide (3,5-Dinitro-o-toluamide)		148-01-6	–	5	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Dinitrobenzene (all isomers) (meta-) (ortho) (para-)		99-65-0 528-29-0 100-25-4	–	1	–	–	–	–	x
Dinitro-o-cresol		534-52-1	–	0.2	–	–	–	–	x
Dinitrotoluene		25321-14- 6	–	1.5	–	–	–	–	x
Dioxane (Diethylene dioxide)		123-91-1	25	90	–	–	–	–	x
Dioxathion (Delnav)		78-34-2	–	0.2	–	–	–	–	x
Diphenyl (Biphenyl)		92-52-4	0.2	1	–	–	–	–	–
Diphenylamine		122-39-4	–	10	–	–	–	–	–
Diphenylmethane diisocyanate; see Methylene bisphenyl isocyanate
Dipropylene glycol methyl ether		34590-94- 8	100	600	150	900	–	–	x
Dipropyl ketone		123-19-3	50	235	–	–	–	–	–
Diquat		2768-72-9	–	0.5	–	–	–	–	–
Di-sec-octyl phthalate [Di(2-ethylhexyl)phthalate]		117-81-7	–	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	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Emery, Respirable dust		1302-74-5	–	5	–	–	–	–	–
Total dust			–	10	–	–	–	–	–
Endosulfan		115-29-7	–	0.1	–	–	–	–	x
Endrin		72-20-8	–	0.1	–	–	–	–	x
Epichlorohydrin		106-89-8	2	8	–	–	–	–	x
EPN		2104-64-5	–	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	8	6	15	–	–	–
Ethion		563-12-2	–	0.4	–	–	–	–	x
2-Ethoxyethanol (EGEE)		110-80-5	200	740	–	–	–	–	x
2-Ethoxyethyl acetate (Cellosolve acetate)		111-15-9	100	540	–	–	–	–	x
Ethyl acetate		141-78-6	400	1400	–	–	–	–	–
Ethyl acrylate		140-88-5	5	20	25	100	–	–	x
Ethyl alcohol (Ethanol)		64-17-5	1000	1900	–	–	–	–	–
Ethylamine		75-04-7	10	18	–	–	–	–	–
Ethyl amyl ketone (5-Methyl-3- heptanone)		541-85-5	25	130	–	–	–	–	–
Ethyl benzene		100-41-4	100	435	125	545	–	–	–
Ethyl bromide		74-96-4	200	890	250	1100	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Ethyl butyl ketone (3-Heptanone)		106-35-4	50	230	–	–	–	–	–
Ethyl chloride		75-00-3	1000	2600	–	–	–	–	–
Ethyl ether		60-29-7	400	1200	500	500 1500	1500 –	–	–
Ethyl formate		109-94-4	100	300	–	–	–	–	–
Ethyl mercaptan		75-08-1	0.5	1	–	–	–	–	–
Ethyl silicate		78-10-4	10	85	–	–	–	–	–
Ethylene chlorohydrin		107-07-3	–	–	–	–	1	3	x
Ethylenediamine		107-15-3	10	25	–	–	–	–	–
Ethylene dibromide		106-93-4	See table G-2
Ethylene dichloride		107-06-2	1	4	2	8	–	–	–
Ethylene glycol		107-21-1	–	–	–	–	50	125	–
Ethylene glycol dinitrate (EGDN)		628-96-6	–	–	–	0.1	–	–	x
Ethylene glycol methyl acetate (EGME); see Methyl cellosolve acetate
Ethyleneimine; see O.H. rule 2301(7) OH Part 350, R 325.35001 to R 325.35011F		151-56-4
Ethylene oxide; see OH Part 304, R 325.51151 to R 325.51177F et seq.F		75-21-8	1	1.8	5	9.0	-	-	-
Ethylidene chloride; see 1,1- Dichloroethane
Ethylidene norbornene		16219-75- 3	–	–	–	–	5	25	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
N-Ethylmorpholine		100-74-3	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, Dust		14484-64- 1	–	10	–	–	–	–	–
Ferrovanadium dust		12604-58- 9	–	1	–	3	–	–	–
Fluorides (as F)		Varies with compound	–	2.5	–	–	–	–	–
Fluorine		7782-41-4	0.1	0.2	–	–	–	–	–
Fluorotrichloromethane (Trichlorofluoromethane)		75-69-4	–	–	–	–	1000	5600	–
Fonofos		944-22-9	–	0.1	–	–	–	–	x
Formaldehyde; see OH Part 306, R 325.51451 to R 325.51477F et seq.F		50-00-0	0.75	0.9	2	2.5
Formamide		75-12-7	20	30	30	45	–	–	–
Formic acid		64-18-6	5	9	–	–	–	–	–
Furfural		98-01-1	2	8	–	–	–	–	x
Furfuryl alcohol		98-00-0	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	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Glycerin,		56-81-5	–	5	–	–	–	–	–
Respirable mist
Total mist			–	10	–	–	–	–	–
Glycidol		556-52-5	25	75	–	–	–	–	–
Glycol monoethyl ether; see 2- Ethoxyethanol
Grain dust (Oat, wheat, barley)		–	–	10	–	–	–	–	–
Graphite, natural Respirable dust		7782-42-5	–	2.5	–	–	–	–	–
Graphite, synthetic,		–	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
GuthionR; see Azinphos methyl
Gypsum, Respirable dust Total dust		13397-24- 5	– –	5 15	– –	– –	– –	– –	– –
Hafnium		7440-58-6	–	0.5	–	–	–	–	–
Heptachlor		76-44-8	–	0.5	–	–	–	–	x
Heptane (n-Heptane)		142-82-5	400	1600	500	2000	–	–	–
Hexachlorobutadiene		87-68-3	–	0.02	0.24	–	–	–	–
Hexachlorocyclopentadiene		77-47-4	0.01	0.1	–	–	–	–	–
Hexachloroethane		67-72-1	1	10	–	–	–	–	x
Hexachloronaphthalene		1335-87-1	–	0.2	–	–	–	–	x
Hexafluoroacetone		684-16-2	0.1	0.7	–	–	–	–	x
n-Hexane		110-54-3	50	180	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Hexane isomers		Varies with compound	500	1800	1000	3600	–	–	–
2-Hexanone (Methyl n-butyl ketone)		591-78-6	5	20	–	–	–	–	–
Hexone (Methyl isobutyl ketone)		108-10-1	50	205	75	300	–	–	–
sec-Hexyl acetate		108-84-9	50	300	–	–	–	–	–
Hexylene glycol		107-41-5	–	–	–	–	25	125	–
Hydrazine		302-01-2	0.1	0.1	–	–	–	–	x
Hydrogenated terphenyls		61788-32- 7	0.5	5	–	–	–	–	–
Hydrogen bromide		10035-10- 6	–	–	–	–	3	10	–
Hydrogen chloride		7647-01-0	–	–	–	–	5	7	–
Hydrogen cyanide		74-90-8	–	–	4.7	5	–	–	x
Hydrogen fluoride (as F)		7664-39-3	3	–	6	–	–	–	–
Hydrogen peroxide		7722-84-1	1	1.4	–	–	–	–	–
Hydrogen selenide (as Se)		7783-07-5	0.05	0.2	–	–	–	–	–
Hydrogen sulfide		7783-06-4	10	14	15	21	–	–	–
Hydroquinone		123-31-9	–	2	–	–	–	–	–
2-Hydroxypropyl acrylate		999-61-1	0.5	3	–	–	–	–	x
Indene		95-13-6	10	45	–	–	–	–	–
Indium and compounds (as In)		7440-74-6	–	0.1	–	–	–	–	–
Iodine		7553-56-2	–	–	–	–	0.1	1	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Iodoform		75-47-8	0.6	10	–	–	–	–	–
Iron oxide fume		1309-37-1	–	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	–	–	–	–	–
Isoamyl acetate		123-92-2	100	525	–	–	–	–	–
Isoamyl alcohol (primary and secondary)		123-51-3	100	360	125	450	–	–	–
Isobutyl acetate		110-19-0	150	700	–	–	–	–	–
Isobutyl alcohol		78-83-1	50	150	–	–	–	–	–
Isooctyl alcohol		26952-21- 6	50	270	–	–	–	–	x
Isophorone		78-59-1	4	23	–	–	–	–	–
Isophorone diisocyanate (IPDI)		4098-71-9	0.005	–	0.02	–	–	–	x
2-Isopropoxyethanol		109-59-1	25	105	–	–	–	–	–
Isopropyl acetate		108-21-4	250	950	310	1185	–	–	–
Isopropyl alcohol		67-63-0	400	980	500	1225	–	–	–
Isopropylamine		75-31-0	5	12	10	24	–	–	–
N-Isopropylaniline		768-52-5	2	10	–	–	–	–	x
Isopropyl ether		108-20-3	500	2100	–	–	–	–	–
Isopropyl glycidyl ether (IGE)		4016-14-2	50	240	75	360	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Kaolin,		–	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Ketene		463-51-4	0.5	0.9	1.5	3	–	–	–
Lead inorganic (as Pb); see OH Part 310, R 325.51901 to R 325.51958F et seq.F		7439-92-1	–	0.05 (50 μg/m3)	–	–	–	–	–
Limestone, (calcium carbonate)		1317-65-3	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Lindane		58-89-9	–	0.5	–	–	–	–	x
Lithium hydride		7580-67-8	–	0.025	–	–	–	–	–
L.P.G. (Liquified petroleum gas)		68476-85- 7	1000	1800	–	–	–	–	–
Magnesite,		546-93-0	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Magnesium oxide fume, Total particulate		1309-48-4	–	10	–	–	–	–	–
Malathion dust		121-75-5	–	10	–	–	–	–	x
Maleic anhydride		108-31-6	1	–	–	–	–	–	–
Manganese,		7439-96-5	– –	– 1	– –	– 3	– –	5 –	– –
Compounds (as Mn) Fume (as Mn)
Manganese cyclopentadienyl tricarbonyl (as Mn)		12079-65- 1	–	0.1	–	–	–	–	x
Manganese tetroxide (as Mn)		1317-35-7	–	1	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Marble (calcium carbonate), Respirable dust Total dust		1317-65-3	– –	5 15	– –	– –	– –	– –	– –
Mercury Inorganic and aryl compounds (As Hg) Organic compounds (as Hg) Vapor (as Hg)		7439-97-6	– – –	– 0.01 0.05	– – –	– 0.03 –	– – –	0.1 – –	x x x
Mesityl oxide		141-79-7	15	60	25	100	–	–	–
Methacrylic acid		79-41-4	20	70	–	–	–	–	x
Methanethiol; see Methyl mercaptan
Methomyl (Lannate)		16752-77- 5	–	2.5	–	–	–	–	–
Methoxychlor dust		72-43-5	–	10	–	–	–	–	–
2-Methoxyethanol; see Methyl cellosolve
4-Methoxyphenol		150-76-5	–	5	–	–	–	–	–
Methyl acetate		79-20-9	200	610	250	760	–	–	–
Methyl acetylene (Propyne)		74-99-7	1000	1650	–	–	–	–	–
Methyl acetylene-propadiene mixture (MAPP)		–	1000	1800	1250	2250	–	–	–
Methyl acrylate		96-33-3	10	35	–	–	–	–	x
Methylacrylonitrile		126-98-7	1	3	–	–	–	–	x
Methylal (Dimethoxymethane)		109-87-5	1000	3100	–	–	–	–	–
Methyl alcohol		67-56-1	200	260	250	325	–	–	x
Methylamine		74-89-5	10	12	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Methyl amyl alcohol; see Methyl isobutyl carbinol
Methyl n-amyl ketone		110-43-0	100	465	–	–	–	–	–
Methyl bromide		74-83-9	5	20	–	–	–	–	x
Methyl n-butyl ketone; see 2-Hexanone
Methyl cellosolve (2-Methoxyethanol)		109-86-4	25	80	–	–	–	–	x
Methyl cellosolve acetate (2-Methoxyethyl acetate)		110-49-6	25	120	–	–	–	–	x
Methyl chloride		74-87-3	50	105	100	210	–	–	–
Methyl chloroform (1,1,1- Trichloroethane)		71-55-6	350	1900	450	2450	–	–	–
Methyl 2-cyanoacrylate		137-05-3	2	8	4	16	–	–	–
Methylcyclohexane		108-87-2	400	1600	–	–	–	–	–
Methylcyclohexanol		25639-42- 3	50	235	–	–	–	–	–
o-Methylcyclohexanone		583-60-8	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(4-cyclohexylisocyanate) (MCBI)		5124-30-1	–	–	–	–	0.01	0.11	–
Methylene bisphenyl isocyanate (MDI)		101-68-8	–	–	–	–	0.02	0.2	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Methylene chloride, see OH Part 313, R 325.51651 to R 325.51652F et seq.F		75-09-2	25	87	125	434
Methylenedianiline (MDA); see OH Part 303, R 325.50051 to R 325.50076F 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	150	375	–	–	–
Methyl hydrazine		60-34-4	–	–	–	–	0.2	0.35	x
Methyl iodide		74-88-4	2	10	–	–	–	–	x
Methyl isoamyl ketone		110-12-3	50	240	–	–	–	–	–
Methyl isobutyl carbinol		108-11-2	25	100	40	165	–	–	x
Methyl isobutyl ketone; see Hexone
Methyl isocyanate (MIC)		624-83-9	0.02	0.05	–	–	–	–	x
Methyl isopropyl ketone		563-80-4	200	705	–	–	–	–	–
Methyl mercaptan		74-93-1	0.5	1	–	–	–	–	–
Methyl methacrylate		80-62-6	100	410	–	–	–	–
Methyl parathion		298-00-0	–	0.2	–	–	–	–	x
Methyl propyl ketone; see 2-Pentanone
Methyl silicate		681-84-5	1	6	–	–	5	30	–
alpha-Methyl styrene		98-83-9	50	240	100	485	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Metribuzin		21087-64- 9	–	5	–	–	–	–	–
Mica; see Silicates
Molybdenum, (as Mo)		7439-98-7	–	10	–	–	–	–	–
Insoluble compounds
Soluble compounds			–	5	–	–	–	–	–
Monocrotophos (AzodrinR)		6923-22-4	–	0.25	–	–	–	–	–
Monomethyl aniline		100-61-8	0.5	2	–	–	–	–	x
Morpholine		110-91-8	20	70	30	105	–	–	x
Naphtha (Coal tar)		8030-30-6	100	400	–	–	–	–	–
Naphthalene		91-20-3	10	50	15	75	–	–	–
alpha-Naphthylamine; see O.H. rule 2301(10)F OH Part 350, R 325.35001 to R 325.35011F		134-32-7
beta-Naphthylamine; see O.H. rule 2301(11)F OH Part 350, R 325.35001 to R 325.35011F		91-59-8
Nickel carbonyl (as Ni)		13463-39- 3	0.001	0.007	–	–	–	–	–
Nickel,		7440-02-0	–	1	–	–	–	–	–
Metal and insoluble compounds (as Ni)
Soluble compounds (as Ni)			–	0.1	–	–	–	–	–
Nicotine		54-11-5	–	0.5	–	–	–	–	x
Nitric acid		7697-37-2	2	5	4	10	–	–	–
Nitric oxide		10102-43- 9	25	30	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
p-Nitroaniline		100-01-6	–	3	–	–	–	–	x
Nitrobenzene		98-95-3	1	5	–	–	–	–	x
p-Nitrochlorobenzene		100-00-5	–	1	–	–	–	–	x
4-Nitrodiphenyl; see O.H. rule 2301(12)F OH Part 350, R 325.35001 to R 325.35011F		92-93-3
Nitroethane		79-24-3	100	310	–	–	–	–	–
Nitrogen dioxide		10102-44- 0	–	–	1	1.8	–	–	–
Nitrogen trifluoride		7783-54-2	10	29	–	–	–	–	–
Nitroglycerin		55-63-0	–	–	–	0.1	–	–	x
Nitromethane		75-52-5	100	250	–	–	–	–	–
1-Nitropropane		108-03-2	25	90	–	–	–	–	–
2-Nitropropane		79-46-9	10	35	–	–	–	–	–
N-Nitrosodimethylamine; see O.H. rule 2301(13)F OH Part 350, R 325.35001 to R 325.35011F		62-75-9
Nitrotoluene o-isomer m-isomer p-isomer		88-72-2 99-08-1 99-99-0	2	11	–	–	–	–	x
Nitrotrichloromethane; see Chloropicrin
Nonane		111-84-2	200	1050	–	–	–	–	–
Octachloronaphthalene		2234-13-1	–	0.1	–	0.3	–	–	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Octane		111-65-9	300	1450	375	1800	–	–	–
Oil mist, mineral		8012-95-1	–	5	–	–	–	–	–
Osmium tetroxide (as Os)		20816-12- 0	–	0.002	–	0.006	–	–	–
Oxalic acid		144-62-7	–	1	–	2	–	–	–
Oxygen difluoride		7783-41-7	–	–	–	–	0.05	0.1	–
Ozone		10028-15- 6	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	–	0.1	–	–	–	–	x
Parathion		56-38-2	–	0.1	–	–	–	–	x
Particulates not otherwise regulated,		–	–	5	–	–	–	–	–
Respirable dust		–
Total dust		–	–	15	–	–	–	–	–
Pentaborane		19624-22- 7	0.005	0.01	0.015	0.03	–	–	–
Pentachloronaphthalene		1321-64-8	–	0.5	–	–	–	–	x
Pentachlorophenol		87-86-5	–	0.5	–	–	–	–	x
Pentaerythritol,		115-77-5	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Pentane		109-66-0	600	1800	750	2250	–	–	–
2-Pentanone (Methyl propyl ketone)		107-87-9	200	700	250	875	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Perchloroethylene (Tetrachloroethylene)		127-18-4	25	170	–	–	–	–	–
Perchloromethyl mercaptan		594-42-3	0.1	0.8	–	–	–	–	–
Perchloryl fluoride		7616-94-6	3	14	6	28	–	–	–
Perlite Respirable dust Total dust		93763-70- 3	– –	5 15	– –	– –	– –	– –	– –
Petroleum distillates (Naphtha) (Rubber solvent)			400	1600	–	–	–	–	–
Phenol		108-95-2	5	19	–	–	–	–	x
Phenothiazine		92-84-2	–	5	–	–	–	–	x
p-Phenylenediamine		106-50-3	–	0.1	–	–	–	–	x
Phenyl ether, vapor		101-84-8	1	7	–	–	–	–	–
Phenyl ether-biphenyl mixture, vapor		–	1	7	–	–	–	–	–
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)		122-60-1	1	6	–	–	–	–	–
Phenylhydrazine		100-63-0	5	20	10	45	–	–	x
Phenyl mercaptan		108-98-5	0.5	2	–	–	–	–	–
Phenylphosphine		638-21-1	–	–	–	–	0.05	0.25	–
Phorate		298-02-2	–	0.05	–	0.2	–	–	x
Phosdrin (MevinphosR)		7786-34-7	–	0.1	–	0.3	–	–	x
Phosgene (Carbonyl chloride)		75-44-5	0.1	0.4	–	–	–	–	–
Phosphine		7803-51-2	0.3	0.4	1	1	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Phosphoric acid		7664-38-2	–	1	–	3	–	–	–
Phosphorus (yellow)		7723-14-0	–	0.1	–	–	–	–	–
Phosphorus oxychloride		10025-87- 3	0.1	0.6	–	–	–	–	–
Phosphorus pentachloride		10026-13- 8	–	1	–	–	–	–	–
Phosphorus pentasulfide		1314-80-3	–	1	–	3	–	–	–
Phosphorus trichloride		7719-12-2	0.2	1.5	0.5	3	–	–	–
Phthalic anhydride		85-44-9	1	6	–	–	–	–	–
m-Phthalodinitrile		626-17-5	–	5	–	–	–	–	–
Picloram,		1918-02-1	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Picric acid		88-89-1	–	0.1	–	–	–	–	x
Piperazine dihydrochloride		142-64-3	–	5	–	–	–	–	–
Pindone (2-Pivalyl-1,3-indandione)		83-26-1	–	0.1	–	–	–	–	–
Plaster of Paris (Calcium sulfate), Respirable dust Total dust		26499-65- 0	– –	5 15	– –	– –	– –	– –	– –
Platinum (as Pt)		7440-06-4	–	1	–	–	–	–	–
Metal
Soluble salts			–	0.002	–	–	–	–	–
Portland cement, Respirable dust Total dust		65997-15- 1	– –	5 10	– –	– –	– –	– –	– –
Potassium hydroxide		1310-58-3	–	–	–	–	–	2	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Propane		74-98-6	1000	1800	–	–	–	–	–
Propargyl alcohol		107-19-7	1	2	–	–	–	–	x
beta-Propriolactone; see O.H. rule    2301(14)F OH Part 350, R 325.35001 to R 325.35011F		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	250	1050	–	–	–
n-Propyl alcohol		71-23-8	200	500	250	625	–	–	–
n-Propyl nitrate		627-13-4	25	105	40	170	–	–	–
Propylene dichloride		78-87-5	75	350	110	510	–	–	–
Propylene glycol dinitrate		6423-43-4	0.05	0.3	–	–	–	–	–
Propylene glycol monomethyl ether		107-98-2	100	360	150	540	–	–	–
Propylene imine		75-55-8	2	5	–	–	–	–	x
Propylene oxide		75-56-9	20	50	–	–	–	–	–
Propyne; see Methyl acetylene
Pyrethrum		8003-34-7	–	5	–	–	–	–	–
Pyridine		110-86-1	5	15	–	–	–	–	–
Quinone		106-51-4	0.1	0.4	–	–	–	–	–
Resorcinol		108-46-3	10	45	20	90	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Rhodium, Insoluble compounds (as Rh) Metal fume (as Rh) Soluble compounds (as Rh)		7440-16-6	– – –	0.1 0.1 0.001	– – –	– – –	– – –	– – –	– – –
Ronnel		299-84-3	–	10	–	–	–	–	–
Rosin core solder pyrolysis products, as formaldehyde		–	–	0.1	–	–	–	–	–
Rotenone		83-79-4	–	5	–	–	–	–	–
Rouge, Respirable dust Total dust		–	– –	5 10	– –	– –	– –	– –	– –
Selenium compounds (as Se)		7782-49-2	–	0.2	–	–	–	–	–
Selenium hexafluoride (as Se)		7783-79-1	0.05	0.4	–	–	–	–	–
Silica, amorphous, precipitated and gel		112926- 00-8	–	6	–	–	–	–	–
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica		61790-53- 2	–	6	–	–	–	–	–
Silica, crystalline cristobalite, Respirable dust		14464-46- 1	–	0.05	–	–	–	–	–
Silica, crystalline quartz, Respirable dust		14808-60- 7	–	0.1	–	–	–	–	–
Silica, crystalline tridymite, Respirable dust		15468-32- 3	–	0.05	–	–	–	–	–
Silica, crystalline tripoli, Respirable dust		1317-95-9	–	0.1	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
				TWA		STELD		Ceiling
	Substance		CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Silica, fused, Respirable dust			60676-86- 0	–	0.1	–	–	–	–	–
Silicates (less than 1% crystalline silica)
		Mica, respirable dust	12001-26- 2	–	3	–	–	–	–	–
		Soapstone, respirable dust	–	–	3	–	–	–	–	–
		Soapstone, total dust	–	–	6	–	–	–	–	–
		Talc (containing asbestos); use asbestos limit	–	OH Part 305 “Asbestos for General Industry,” R 325.51311 to R 325.51312 et seq., Asbestos for General Industry
		Talc (containing no asbestos), respirable dust	14807-96- 6	–	2	–	–	–	–	–
		Tremolite	–	OH Part 305 “Asbestos for General Industry,” R 325.51311 to R 325.51312 et seq., Asbestos for General Industry
Silicon, Respirable dust Total dust			7440-21-3	– –	5 10	– –	– –	– –	– –	– –
Silicon carbide, Respirable dust Total dust			409-21-2	– –	5 10	– –	– –	– –	– –	– –
Silicon tetrahydride			7803-62-5	5	7	–	–	–	–	–
Silver, metal and soluble compounds (as Ag)			7440-22-4	–	0.01	–	–	–	–	–
Soapstone; see Silicates
Sodium azide (as HN3) (as NaN3)			26628-22- 8	– –	– –	– –	– –	0.1 –	– 0.3	x x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Sodium bisulfite		7631-90-5	–	5	–	–	–	–	–
Sodium fluoroacetate		62-74-8	–	0.05	–	0.15	–	–	x
Sodium hydroxide		1310-73-2	–	–	–	–	–	2	–
Sodium metabisulfite		7681-57-4	–	5	–	–	–	–	–
Starch,		9005-25-8	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Stibine		7803-52-3	0.1	0.5	–	–	–	–	–
Stoddard solvent		8052-41-3	100	525	–	–	–	–	–
Strychnine		57-24-9	–	0.15	–	–	–	–	–
Styrene		100-42-5	50	215	100	425	–	–	–
Subtilisins (Proteolytic enzymes)		9014-01-1	–	–	–	0.00006 (60 min.)	–	–	–
Sucrose,		57-50-1	–	5	–	–	–	–	–
Respirable dust
Total dust			–	15	–	–	–	–	–
Sulfur dioxide		7446-09-5	2	5	5	10	–	–	–
Sulfur hexafluoride		2551-62-4	1000	6000	–	–	–	–	–
Sulfuric acid		7664-93-9	–	1	–	–	–	–	–
Sulfur monochloride		10025-67- 9	–	–	–	–	1	6	–
Sulfur pentafluoride		5714-22-7	–	–	–	–	0.01	0.1	–
Sulfur tetrafluoride		7783-60-0	–	–	–	–	0.1	0.4	–
Sulfuryl fluoride		2699-79-8	5	20	10	40	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Sulprofos		35400-43- 2	–	1	–	–	–	–	–
SystoxR; see Demeton
2,4,5-T (2,4,5-trichlorophenoxyacetic acid)		93-76-5	–	10	–	–	–	–	–
Talc; see Silicates
Tantalum, metal and oxide dust		7440-25-7	–	5	–	–	–	–	–
TEDP (Sulfotep)		3689-24-5	–	0.2	–	–	–	–	x
Tellurium and compounds (as Te)		13494-80- 9	–	0.1	–	–	–	–	–
Tellurium hexafluoride (as Te)		7783-80-4	0.02	0.2	–	–	–	–	–
Temephos,		3383-96-8	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
TEPP		107-49-3	–	0.05	–	–	–	–	x
Terphenyls		26140-60- 3	–	–	–	–	0.5	5	–
1,1,1,2-Tetrachloro-2, 2-difluoroethane		76-11-9	500	4170	–	–	–	–	–
1,1,2,2-Tetrachloro-1, 2-difluoroethane		76-12-0	500	4170	–	–	–	–	–
1,1,2,2-Tetrachloroethane		79-34-5	1	7	–	–	–	–	x
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane; see Carbon tetrachloride
Tetrachloronaphthalene		1335-88-2	–	2	–	–	–	–	x

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Tetraethyl lead (as Pb)		78-00-2	–	0.075	–	–	–	–	x
Tetrahydrofuran		109-99-9	200	590	250	735	–	–	–
Tetramethyl lead (as Pb)		75-74-1	–	0.075	–	–	–	–	x
Tetramethyl succinonitrile		3333-52-6	0.5	3	–	–	–	–	x
Tetranitromethane		509-14-8	1	8	–	–	–	–	–
Tetrasodium pyrophosphate		7722-88-5	–	5	–	–	–	–	–
Tetryl (2,4,6- Trinitrophenylmethylnitramine)		479-45-8	–	1.5	–	–	–	–	x
Thallium, soluble compounds (as Tl)		7440-28-0	–	0.1	–	–	–	–	x
4,4'-Thiobis(6-tert-butyl-m-cresol) Respirable dust Total dust		96-69-5	– –	5 10	– –	– –	– –	– –	– –
Thioglycolic acid		68-11-1	1	4	–	–	–	–	x
Thionyl chloride		7719-09-7	–	–	–	–	1	5	–
Thiram		137-26-8	–	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	– – –	– – –	– – –	– – –	– x –
Titanium dioxide Total dust		13463-67- 7	–	10	–	–	–	–	–
Toluene		108-88-3	100	375	150	560	–	–	–
Toluene-2,4-diisocyanate (TDI)		584-84-9	0.005	0.04	0.02	0.15	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
m-Toluidine		108-44-1	2	9	–	–	–	–	x
o-Toluidine		95-53-4	5	22	–	–	–	–	x
p-Toluidine		106-49-0	2	9	–	–	–	–	x
Toxaphene; see Chlorinated camphene
Tremolite; see Silicates
Tributyl phosphate		126-73-8	0.2	2.5	–	–	–	–	–
Trichloroacetic acid		76-03-9	1	7	–	–	–	–	–
1,2,4-Trichlorobenzene		120-82-1	–	–	–	–	5	40	–
1,1,1-Trichloroethane; see Methyl chloroform
1,1,2-Trichloroethane		79-00-5	10	45	–	–	–	–	x
Trichloroethylene		79-01-6	50	270	200	1080	–	–	–
Trichloromethane; see Chloroform
Trichloronaphthalene		1321-65-9	–	5	–	–	–	–	x
1,2,3-Trichloropropane		96-18-4	10	60	–	–	–	–	–
1,1,2-Trichloro-1,2,2-trifluoroethane		76-13-1	1000	7600	1250	9500	–	–	–
Triethylamine		121-44-8	10	40	15	60	–	–	–
Trifluorobromomethane		75-63-8	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	–	–	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Trimethyl phosphite		121-45-9	2	10	–	–	–	–	–
2,4,6-Trinitrophenol; see Picric acid
2,4,6-Trinitrophenylmethylnitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)		118-96-7	–	0.5	–	–	–	–	x
Triorthocresyl phosphate		78-30-8	–	0.1	–	–	–	–	x
Triphenyl amine		603-34-9	–	5	–	–	–	–	–
Triphenyl phosphate		115-86-6	–	3	–	–	–	–	–
Tungsten		7440-33-7	– –	5 1	– –	10 3	– –	–	–
Insoluble compounds (as W) Soluble compounds (as W)
Turpentine		8006-64-2	100	560	–	–	–	–	–
Uranium (as U)		7440-61-1	–	0.2	–	0.6	–	–	–
Insoluble compounds
Soluble compounds			–	0.05	–	-	–	–	–
n-Valeraldehyde		110-62-3	50	175	–	–	–	–	–
Vanadium pentoxide		1314-62-1	–	0.05	–	–	–	–	–
Fume (as V2O5)
Respirable dust (as V2O5)			–	0.05	–	–	–	–	–
Vegetable oil mists		–	–	5	–	–	–	–	–
Respirable mist
Total mist			–	15	–	–	–	–	–
Vinyl acetate		108-05-4	10	30	20	60	–	–	–
Vinyl benzene; see Styrene
Vinyl bromide		593-60-2	5	20	–	–	–	–	–

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Vinyl chloride; see OH Part 302, R 325.51401 to R 325.51414F et seq.F		75-01-4	1	2.5	5	12.8
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	–	–	–	–	–
VM & P Naphtha		8032-32-4	300	1350	400	1800	–	–	–
Warfarin		81-81-2	–	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	–	–	–	–	–
Xylene (o-,m-,p-isomers) (Dimethyl benzene)		1330-20-7	100	435	150	655	–	–	–
m-Xylene-alpha, alpha’-diamine		1477-55-0	–	–	–	–	–	0.1	x
Xylidine		1300-73-8	2	10	–	–	–	–	x
Yttrium		7440-65-5	–	1	–	–	–	–	–
Zinc chloride fume		7646-85-7	–	1	–	2	–	–	–
Zinc chromates (as CrO3) (as Cr+6); see OH Part 315, R 325.50141 to R 325.50143F, G		Varies with compound	–	0.005 (5 μg/m3)	–	–	–	0.1  –	–
Zinc oxide fume		1314-13-2	–	5	–	10	–	–	–

 

TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
			TWA		STELD		Ceiling
	Substance	CAS No.A	ppmB	mg/m3C	ppmB	mg/m3C	ppmB	mg/m3C	Skin Designation
Zinc oxide,		1314-13-2	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Zinc stearate		557-05-1	–	5	–	–	–	–	–
Respirable dust
Total dust			–	10	–	–	–	–	–
Zirconium compounds (as Zr)		7440-67-7	–	5	–	10	–	–	–

 

TABLE G-2. EXPOSURE LIMITS FOR AIR CONTAMINATES
Substance		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	BenzeneE,F	10 ppm	25 ppm	50 ppm	10 minutes
	Beryllium and beryllium compounds	2 µg/m3	5 µg/m3	25 µg/m3	30 minutes
S	Ethylene dibromide	20 ppm	30 ppm	50 ppm	5 minutes
Note: S above signifies that skin contact shall not be allowed.

 

*	As determined from breathing-zone air samples.
**	Parts per billion.
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.
B	Parts of vapor or gas per million parts of contaminated air by volume at 25°C and 760 torr.
C	Approximate milligrams of substance per cubic meter of air.
D	Duration is for 15 minutes, unless otherwise noted.

 

E	The final benzene standard in OH Part 311, R 325.77101 to R 325.77115 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.
G	If the exposure limit in §1910.1026 (adopted by reference in OH Part 315, R 325.50141 to R 325.50143) is stayed or is otherwise not in effect, the exposure limit is a ceiling of 0.1 mg/m3.