Section 325.60159. Maximum allowable concentrations for substances; N to P.

Rule 9. Table 5. Substances N to P

TABLE 5
	Substance	MAC/Ceiling/STEL
		ppm	mg/m3
	Naphtha (coal tar)	100	400
	Naphtha (petroleum) (MAC will be based on aromatic hydrocarbons in mixture)
	Naphthalene	10	50
A	beta-Naphthylamine	---
	Neon	Inert gas
	Nickel carbonyl	0.001	0.007
	Nickel, metal and soluble compounds (as Ni)	---	1
S	Nicotine	---	0.5
	Nitric acid	2	5
	Nitric oxide	25	30
S	p-Nitroaniline	1	6
S	Nitrobenzene	1	5
S	p-Nitrochlorobenzene	---	1
	Nitroethane	100	310
	Nitrogen	Inert gas

	Nitrogen dioxide	5	9
	Nitrogen trifluoride	10	29
S	Nitroglycerin	0.2	2
	Nitromethane	100	250
	1-Nitropropane	25	90
	2-Nitropropane	25	90
S,A	N-Nitrosodimethylamine (dimethylnitrosomine)	---
S	Nitrotoluene	5	30
	Nitrotrichloromethane, see Chloropicrin
	Nitrous oxide	Inert gas
S	Octachloronaphthalene	---	0.1
	Octane	400	1,900
	Oil mist, particulate	---	5
	Oil mist, vapor (MAC will be based on aromatic hydrocarbons in mixture)
	Osmium tetroxide	---	0.002
	Oxalic acid	---	1
	Oxygen difluoride	0.05	0.1
	Ozone	0.1	0.2
S	Paraquat	---	0.5
S	Parathion	---	0.1
	Pentaborane	0.005	0.01
S	Pentachloronaphthalene	---	0.5
S	Pentachlorophenol	---	0.5
	Pentaerythritol	Inert particulate
	Pentane	500	1,500
	2-Pentanone	200	700
	Perchloroethylene	100	670
	Perchloromethyl mercaptan	0.1	0.8
	Perchloryl fluoride	3	13.5
	Petroleum  distillates  (naphtha)  (MAC  will  be   based  on  aromatic   hydrocarbons  in mixture)
S	Phenol	5	19
S	p-Phenylene diamine	---	0.1
	Phenyl ether (vapor)	1	7
	Phenyl ether-biphenyl mixture (vapor)	1	7
	Phenylethylene, see Styrene
	Phenyl glycidyl ether (PGE)	10	60
S	Phenylhydrazine	5	22
S	Phosdrin (Mevinphos®)	---	0.1
	Phosgene (carbonyl chloride)	0.1	0.4
	Phosphine	0.3	0.4

	Phosphoric acid	---	1
	Phosphorus (yellow)	---	0.1
	Phosphorus pentachloride	---	1
	Phosphorus pentasulfide	---	1
	Phosphorus trichloride	0.5	3
	Phthalic anhydride	2	12
S	Picric acid	---	0.1
	Pival® (2-pivalyl-1,3-indandione)	---	0.1
	Plaster of Paris	Inert dust
	Platinum, soluble salts (as Pt)	---	0.002
	Polytetrafluoroethylene decomposition products, see Teflon® decomposition products
	Propane	Inert gas
S	Propargyl alcohol	1	---
A	beta-Propiolactone	---
	n-Propyl acetate	200	840
	Propyl alcohol	200	500
	n-Propyl nitrate	25	110
	Propylene bichloride	75	350
S	Propylene imine	2	5
	Propylene oxide	100	240
	Propyne, see Methyl acetylene
	Pyrethrum	---	5
	Pyridine	5	15

A --- See R 325.60154(2)(a).

C --- See R 325.60154(2)(b).

S --- See R 325.60154(2)(c).

History: 2002 AACS; 2013 AACS.