Gas or Vapour to be Measured Chemical Formula	Gastec Tube No. & Name		Measuring Range (ppm)	No.of Pump Strokes	Shelf Life (year)	Note		TLV- TWA,C (ACGIH) (ppm)
1,1,2,2-Tetrabromoethane Br2CHCHBr2	135L	Methyl chloroform	0.92-9.2	4	2	+T		-
Tetrachlorodifluoroethane (R112) CCl2FCl2F	51H	Fluorochlorocarbons (Pyrotec tube)	1000-3000	1/2	3	+		500
			125-1000	1
	51	Fluorochlorocarbons (Pyrotec tube)	7-280	1	3	+
	51L	Fluorochlorocarbons (Pyrotec tube)	20-54	1	3	+
			1-20	2
1,1,2,2-Tetrachloroethane Cl2CHCHCl2	131L	Vinyl chloride	4-80	4	2*	+T		1
Tetrachloroethylene Cl2C:CCl2	133HA	Tetrachloroethylene	300-900	1/2	2*	-		25
			20-300	1
			7-20	2
	133M	Tetrachloroethylene	100-250	1/2	2*	T
			5-100	1
			2-5	2
	133L	Tetrachloroethylene	25-70	1/2	2*	T
			2-25	1
			1-2	2
	133LL	Tetrachloroethylene	3-9	1/2	2*	T
			0.2-3	1
			0.1-0.2	2
	132HH	Trichloroethylene	0.075-1.5%	1	3	T
Tetrachloromethane	See Carbon tetrachloride
Tetrahydrofuran C4H8O	159	Tetrahydrofuran	50-800	1	3	T		200
			20-50	2
	161	Ethyl ether	0.056-1.4%	1	3	T
Tetrahydrothiophene C4H8S	76H	Tetrahydrothiophene	10-200	1	2	+T		-
	76	Tetrahydrothiophene	1-10	4	2	+T
	76M	Tetrahydrothiophene	10-100 mg/m3	2	2	+T
Tetramethylenediamine H2N(CH2)4NH2	180L	Amines	0.8-16	1	2	+T		-
Thionyle chloride SOCl2	5La	Sulphur dioxide	1.44-21.6	2	3	T		-
Toluene C6H5CH3	122	Toluene	300-600	1/2	3	-		50
			10-300	1
			5-10	2
	122L	Toluene	50-100	1	3	-
			2-50	2
			1-2	4
	161	Ethyl ether	0.02-0.8%	1	3	T
Toluol	See Toluene
o-Toluidine C6H4(CH3)(NH2)	181	Aniline	5-60	2	3	-		2
Trichloroacetic acid CCl3COOH	15L	Nitric acid	1-37.5	1	3	H		1
1,2,4-Trichlorobenzene C6H3Cl3	131La	Vinyl chloride	0.65-13	4	2*	+		C 5
1,1,1-Trichloroethane	See Methyl chloroform
1,1,2-Trichloroethane Cl2CHCH2Cl	135	Methyl chloroform	220-1100	2	3	+T		10
Trichloroethylene Cl2C:CHCl	132HH	Trichloroethylene	1-2.5%	1/2	3	T		50
			0.05-1%	1
	132HA	Trichloroethylene	500-1300	1/2	2*	T
			50-500	1
			20-50	2
	132M	Trichloroethylene	100-250	1/2	2*	T
			5-100	1
			2-5	2
	132L	Trichloroethylene	25-70	1/2	2*	T
			2-25	1
			1-2	2
	132LL	Trichloroethylene	4-8.8	1/2	2*	T
			0.25-4	1
			0.125-0.25	2
Trichlorofluoromethane (R11) CCl3F	51H	Fluorochlorocarbons (Pyrotec tube)	2200-6600	1	3	+		C 100
			275-2200	2
	51	Fluorochlorocarbons (Pyrotec tube)	8-320	1	3	+
	51L	Fluorochlorocarbons (Pyrotec tube)	16-43	1	3	+
			0.8-16	2
Trichloromethane	See Chloroform
Trichloronitromethane	See Chloropicrin
1,2,3-Trichloropropane CH2ClCHClCH2Cl	135L	Methyl chloroform	36-360	2	2	+T		10
1,1,2-Trichloro -1,2,2-trifluoroethane (R113) CClF2CCl2F	51H	Fluorochlorocarbons (Pyrotec tube)	2000-6000	1/2	3	+		1000
			250-2000	1
	51	Fluorochlorocarbons (Pyrotec tube)	10-400	1	3	+
	51L	Fluorochlorocarbons (Pyrotec tube)	20-54	1	3	+
			1-20	2
Trichlorotrifluoroethane (R113b) CCl3CF3	51H	Fluorochlorocarbons (Pyrotec tube)	1600-4800	1/2	3	+		1000
			200-1600	1
	51	Fluorochlorocarbons (Pyrotec tube)	10-400	1	3	+
	51L	Fluorochlorocarbons (Pyrotec tube)	16-43	1	3	+
			0.8-16	2
Triethylamine (C2H5)3N	180	Amines	4.5-90	1	3	T		1
	180L	Amines	0.3-6	1	2	T
Trimethylamine (CH3)3N	3M	Ammonia	25-250	1	3			5
	180	Amines	3.5-70	1	3	T
	180L	Amines	0.25-5	1	2	T
Trimethyl benzene C6H3(CH3)3	123	Xylene	10-300	2	3	-		25

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