GasorVapour tobeMeasured ChemicalFormula	Réf tube	Gastec Tube No. & Name	Measuring Range (ppm)	No.of Pump Strokes	Shelf Life (year)	Note		TLV- TWA,C (ACGIH) (ppm)
Pentachloroethane Cl2CHCCl3	133L	Perchloroethylene	20-500	1	2*	T		-
1,3-Pentadiene CH3CH:CHCH:CH2	174	1,3-Butadiene	250-4000	1	3	T		-
	174L	1,3-Butadiene	42.5-850	4	3	T		-
Pentamethylenediamine H2N(CH2)5NH2	180L	Amines	0.75-15	1	2	T		-
n-Pentane CH3(CH2)3CH3	104	Butane	30-1680	1	3	-		600
	103	Hydrocarbons (LowerClass)	0.0375-1.8%	4	3	++
2-Pentenenitrile CH3CH2CH:CHCN	193	2-Pentenenitrile	6-15	2	3	+T		-
			0.5-6	4
	191L	Acrylonitrile	0.24-7.2	2	3	-
3-Pentenenitrile CH3CH:CHCH2CN	191L	Acrylonitrile	0.4-12	2	3	-		-
Pentyl acetate	See n-Amyl acetate
Perchloroethylene	See Tetrachloroethylene
Petroleum distillates	See Gasoline(Petrol)
Petroleum naphtha	106	Petroleum naphtha	14-28mg/l	1/2	3	-		-
			1-14mg/l	1
			0.5-1mg/l	2
Phenol C6H5OH	60	Phenol	62.5-187	1/2	2*	T		5
			25-62.5	1
			1-25	2
			0.4-1	4
Phenylethylene	See Styrene
Phosgene COCl2	16	Phosgene	5-20	1	1.5*	T		0.1
			0.1-5	5
			0.05-0.1	10
Phosphine PH3	7J	Phosphine	500-1000	1/2	3	-		0.3
			25-500	1
			2.5-25	2-10
	7	Phosphine	50-100	1	3	-
			5-50	2
			2.5-5	4
	7L	Phosphine	0.3-5	5	3	-
			0.15-0.3	10
	7LA	Phosphine	2.5-9.8	1	2	T
			1.5-2.5	3
			0.1-1.5	5
			0.05-0.1	10
ƒ¿-Pinene C10H16	121	Benzene	95-1140	3	3	-		-
Propane CH3CH2CH3	103	Hydrocarbons (LowerClass)	1.2-2.4%	1/2	2	++		2500
			0.1-1.2%	1
			0.05-0.1%	2
Propionaldehyde CH3CH2CHO	91L	Formaldehyde	0.76-38	1	3*	T		-
	151L	Acetone	24-1880	2	2*	T
Propionic acid CH3CH2COOH	81	Acetic acid	3-75	1	3	H		10
	81L	Acetic acid	0.25-10	1	2*	T
Propionitrile CH3CH2CN	191	Acrylonitrile	50-1200	4	3	+T		-
Propyl acetate CH3CO2CH2CH2CH3	145	Propyl acetate	20-500	2	2	T		200
Propyl alcohol CH3(CH2)2OH	113	Isopropyl alcohol	0.04-2.5%	1	3	T		200
	113L	Isopropyl alcohol	65-1040	1	3	T
Propylamine CH3(CH2)2NH2	180	Amines	6-120	1	3	T		-
	180L	Amines	0.5-10	1	2	T
Propylene CH3CH:CH2	100A	LPG	0.02-0.8%	1	3	-		-
Propylene dichloride CH3CHClCH2Cl	131La	Vinyl chloride	40-800	2	2*	+		75
Propylene imine CH3CHCH2NH	180	Amines	5.5-110	1	3	T		2
	180L	Amines	0.35-7	1	2	T
Propylene oxide CH3CHCH2O	163	Ethylene oxide	0.065-3.9%	1	3	-		20
	163L	Ethylene oxide	1-100	1	1*	+T
Propyl mercaptan CH3(CH2)2SH	70	Mercaptans	22.5-540	1	3	-		-
	70L	Mercaptans	4.8-9.6	1/2	2	-
			0.6-4.8	1
			0.24-0.6	2
			0.12-0.6	4
Pyridine C5H5N	182	Pyridine	14-35	1/2	3	T		5
			0.5-14	1
			0.2-0.5	2
3,3-Dichloro-1,1,2,2 -pentafluoropropane (R225ca) CHCl2CF2CF3	51	Fluorochlorocarbons (Pyrotectube)	20-800	1	3	+		-
	51L	Fluorochlorocarbons (Pyrotectube)	1.1-22	2	3	+		-

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