Gas or Vapour to be Measured Chemical Formula	Réf tube	Gastec Tube No. & Name	Measuring Range (ppm)	No.of Pump Strokes	Shelf Life (year)	Note		TLV- TWA,C (ACGIH) (ppm)
Carbon dioxide CO2	2HH	Carbon dioxide	5-40%	1/2	3	-		5000
			2.5-5%	1
	2H	Carbon dioxide	10-20%	1/2	3	-
			1-10%	1
			0.5-1%	2
	2L	Carbon dioxide	3-6%	1/2	3	-
			0.25-3%	1
			0.13-0.25%	2
	2LC	Carbon dioxide	2000-4000	1/2	2	-
			100-2000	1
	2LL	Carbon dioxide	300-5000	1	3	-
Carbon disulphide CS2	13M	Carbon disulphide	1600-4000	1/2	3	+T		10
			50-1600	1
			20-50	2
	13	Carbon disulphide	50-100	1/2	3	+T
			2.5-50	1
			1.3-2.5	2
			0.63-1.3	4
Carbon monoxide CO	1HH	Carbon monoxide	2-40%	1/2	3	-		25
			1-2%	1
	1H	Carbon monoxide	5-10%	1/2	3	-
			0.2-5%	1
			0.1-0.2%	2
	1M	Carbon monoxide	2-4%	1/2	3	-
			0.1-2%	1
			0.05-0.1%	2
	1LM	Carbon monoxide	1000-2000	1/2	3	-
			50-1000	1
			25-50	2
	1L	Carbon monoxide	1000-2000	1/2	3	-
			25-1000	1
			2.5-25	2-10
	1La	Carbon monoxide	500-1000	1/2	3	T
			25-500	1
			8-25	2-3
	1LC	Carbon monoxide	1-30	1	2	T
	1LK	Carbon monoxide (in Hydrogen)	300-600	1/2	3	-
			100-300	1
			5-100	3
	1LL	Carbon monoxide	5-50	2	3	-
Carbon tetrachloride CCl4	134	Carbon tetrachloride	2.5-60	1	1*	+		5
			0.5-2.5	2-5
	134L	Carbon tetrachloride	5-12	1	1*	+
			0.25-5	2
Carbonyl chloride	See Phosgene
Carbonyl sulphide COS	21	Carbonyl sulphide	100-200	1/2	2*	+		-
			10-100	1
			5-10	2
	21LA	Carbonyl sulphide	50-125	1/2	2*	+T
			5-50	1
			2-5	2
Chlorine Cl2	8HH	Chlorine	0.5-10%	1/2	3	-		0.5
			0.25-0.5%	1
	8H	Chlorine	500-1000	1/2	3	-
			50-500	1
			25-50	2
	8La	Chlorine	8-16	1/2	3	-
			0.5-8	1
			0.05-0.5	2-5
	8LL	Chloride	1-2	1/2	1*	-
			0.05-1	1
			0.025-0.05	2
	80	Acid gases	14-28	1	2	-
			0.7-14	2
			0.35-0.7	4
Chlorine dioxide ClO2	8H	Chlorine	25-250	1	3	-		0.1
	23M	Chlorine dioxide	0.1-0.5	2-5	3	-
			0.5-5	1
			5-10	1/2
	8La	Chlorine	0.3-4.8	1	3	-
	23L	Chlorine dioxide	0.025-0.05	2	1	-
			0.05-0.6	1
			0.6-1.2	1/2
Chlorobenzene C6H5Cl	126	Chlorobenzene	200-500	1/2	3	-		10
			5-200	1
			2-5	2
	126L	Chlorobenzene	10-43	1	2*	-
			0.5-10	3
Chlorobromomethane CH2BrCl	135	Methyl chloroform	22-110	1	3	+T		200
Chlorocyclohexane C6H11Cl	102L	n-Hexane	50-1200	2	3	-		-
Chlorodifluoromethane(R22) CHClF2	51H	FluorochloroCarbons (Pyrotectube)	0.8-2.4%	1/2	3	+		1000
			0.1-0.8%	1
	51	FluorochloroCarbons (Pyrotectube)	25-1000	1	3	+
	51L	FluorochloroCarbons (Pyrotectube)	50-135	1	3	+
			2.5-50	2
1-Chloro-2,3- epoxy propane	See Epichlorohydrin
2-Chloroethanol	See Ethylene chlorohydrin
Chloroethylene	See Vinyl chloride
Chloroform CHCl3	137	Chloroform	100-400	3	3	+H		10
			10-100	5
			4-10	7
	137L	Chloroform	10-27	3	1*	+T
			0.5-10	5
Chloropicrin Cl3CNO2	134	Carbon tetrachloride	2.5-60	1	1*	+		0.1
m-Cresol C6H4(CH3)OH	61	o-Cresol	1-25	2	2*	T		5
o-Cresol C6H4(CH3)OH	61	o-Cresol	25-62.5	1	2*	T		5
			1-25	2
			0.4-1	4
p-Cresol C6H4(CH3)OH	61	o-Cresol	1-25	2	2*	T		5
Cumene C6H5CH(CH3)2	122L	Toluene	3.2-80	2	3	-		50
Cyclohexane C6H12	102H	n-Hexane	0.1-1.2%	1/2	3	-		300
			0.03-0.6%	1
			0.015-0.03%	2
	102L	n-Hexane	60-1440	1	3	-
Cyclohexanol C6H11OH	118	Cyclohexanol	5-100	2	2	T		50
Cyclohexanone C6H10O	154	Cyclohexanone	30-75	2	2*	T		25
			2-30	4
	91L	Formaldehyde	10-470	1/2	3*	T
Cyclohexene C6H12	151	Acetone	0.01-0.8%	1	3	T		300
Cyclohexylamine C6H13N	180	Amines	7-140	1	3	T		10
	180L	Amines	0.5-10	1	2	T
Cymene C10H14	141L	Ethyl acetate	25-270	1/2	2	T		-
n-Decane CH3(CH2)8CH3	105	HydroCarbons (HigherClass)	400-6000	1	3	-		-
			200-400	2

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