Gas o 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)
n-Decan CH3(CH2)8CH3	105	Hydrocarbons (HigherClass)	400-6000	1	3	-	-
			200-400	2
Diacetone alcohol (CH3)2C(OH)CH2COCH3	154	Cyclohexanone	2.5-100	2	2*	T	50
Diacetyl CH3COCOCH3	92	Acetaldehyde	25-1500	3	2*	T	-
1,2-Diaminoethane	See Ethylenediamine
Diborane B2H6	22	Diborane	2-5	1	2	T	0.1
			0.05-2	2
			0.02-0.05	5
1,1-Dibromoethane CH3CHBr2	136L	Methyl bromide	7-70	1	2	+	-
1,2-Dibromoethane	See Ethylene dibromide
Dibromomethane CH2Br2	136L	Methyl bromide	5-50	1	2	+	-
Di-n-butylamine (CH3CH2CH2CH2)2NH	180L	Amines	0.4-8	1	2	T	-
Dichlorvos C4H7Cl2O4P	132LL	Trichloroethylene	0.2-3.2	1	2*	T	0.9 mg/m3
			0.1-1.6	2
			0.05-0.8	4
m-Dichlorobenzene C6H4Cl2	127	o-Dichlorobenzene	2.5-300	2	3	T	-
o-Dichlorobenzene C6H4Cl2	127	o-Dichlorobenzene	2.5-300	2	3	T	25
p-Dichlorobenzene C6H4Cl2	127	o-Dichlorobenzene	2.5-300	2	3	T	10
Dichlorodifluoromethane (R12) CCl2F2	51H	Fluorochlorocarbons (Pyrotectube)	2600-7800	1/2	3	+	1000
			325-2600	2
	51	Fluorochlorocarbons (Pyrotectube)	11-440	1	3	+
	51L	Fluorochlorocarbons (Pyrotectube)	36-97	1	3	+
			1.8-36	2
1,1-Dichloroethane CH3CHCl2	135	Methylchloroform	40-200	4	3	+T	100
1,2-Dichloroethane	SeeEthylene dichloride
1,1-Dichloroethylene	SeeVinylidene chloride
1,2-Dichloroethylene ClCH:CHCl	139	1,2-Dichloroethylene	100-250	1/2	2*	T	200
			10-100	1
			5-10	2
	132HA	Trichloroethylene	80-800	1	2*	T
	132LL	Trichloroethylene	0.4-6	1	2*	-
1,1-Dichloro-1-fluoroethane (R141b) CH3CCl2F	51	Fluorochlorocarbons (Pyrotectube)	400-1000	1/2	3	+	-
			10-400	1
	51L	Fluorochlorocarbons (Pyrotectube)	1.1-22	2	3	+
Dichloromethane	See Methylene chloride
1,2-Dichloropropane	See Propylene dichloride
1,3-Dichloropropene ClCH2CH:CHCl	132HA	Trichloroethylene	45-450	2	2*	T	1
	131La	Vinyl chloride	0.5-10	2	2*	+
1,2-Dichloro-1,1,1-tetrafluoroethane (R114) CClF2CClF2	51H	Fluorochlorocarbons (Pyrotectube)	3800-11400	1/2	3	+	1000
			475-3800	1
	51	Fluorochlorocarbons (Pyrotectube)	20-800	1	3	+
	51L	Fluorochlorocarbons (Pyrotectube)	36-97	1	3	+
			1.8-36	2
2,2-Dichloro-1,1,1trifluoroethane (R123) CHCl2CF3	51	Fluorochlorocarbons (Pyrotectube)	560-1600	1/2	3	+	-
			14-560	1
	51L	Fluorochlorocarbons (Pyrotectube)	1.4-28	2	3	+
Diethylamine (C2H5)2NH	180	Amines	5.5-110	1	3	T	5
	180L	Amines	0.45-9	1	2	T
Diethylaminoethanol (C2H5)NCH2CH2OH	180L	Amines	0.6-12	1	2	T	2
Diethylbenzene C6H4(C2H5)2	122L	Toluene	2-150	4	3	-	-
Diethylenetriamine H2NCH2CH2NHCH2CH2NH2	180L	Amines	0.95-19	1	2	T	1
Diethylether	See Ethyl ether
Diisobutylene (CH3)3CCH:C(CH3)2	121	Benzene	45-540	1	3	-	-
Diisobutylketone m(CH3)2CHCH2n2CO	102L	n-Hexane	0.2-1%	2	3	-	25
	91L	Formaldehyde	0.58-29	4	3*	T
Diisopropyl benzene C6H5NmCH(CH3)2n2	141L	Ethyl acetate	12-400	1/2	2	T	-
Diisopropyl toluene C6H4(CH3)N mCH(CH3)2n2	141L	Ethyl acetate	12-400	1/2	2	T	-
Diisopropylamine m(CH3)2CHn2NH	180	Amines	5-100	1	3	T	5
	180L	Amines	0.3-6	1	2	T
N,N-Dimethyl acetamide CH3CON(CH3)2	184	N,N-Dimethyl acetamide	60-240	1	3	T	10
			5-60	2
			1.5-5	4
Dimethylamine (CH3)2NH	3H	Ammonia	1.2-19.2%	1	3	-	5
	180	Amines	5.5-110	1	3	T
	180L	Amines	0.45-9	1	2	T
2-Dimethylaminoethanol (CH3)2NCH2CH2OH	180L	Amines	0.65-13	1	2	T	-
Dimethylaminopropylamine (CH3)2NCH2CH2CH2NH2	180	Amines	8-160	1	3	T	-
	180L	Amines	0.6-12	1	2
N,N-Dimethylaniline C6H3(CH3)2(NH2)	181	Aniline	2.5-30	3	3	-	5
Dimethylbenzene	See Xylene
Dimethyl disulphide (CH3)2S2	53	Dimethyl sulphide (Pyrotec tube)	0.16-6	3	3	+	-
N,N-Dimethylethylamine C2H5N(CH3)2	180	Amines	4-80	1	3	T	-
	180L	Amines	0.3-6	1	2	T
N,N-Dimethyl formamide HCON(CH3)2	183	N,N-Dimethyl formamide	30-90	1/2	3	T	10
			2-30	1
			0.8-2	2
2,6-Dimethyl-4-heptanone	See Diisobutyl ketone
Dimethylhydrazine NH2N(CH3)2	185	Hydrazine	0.1-2	5	3	H	0.5
Dimethylsulphide (CH3)2S	53	Dimethyl sulphide (Pyrotectube)	0.5-10	3	2	+	-
			0.25-0.5	5
	77	TBM and DMS	1-15mg/l	1	2*	+T
1,4-Dioxane C4H8O2	159	Tetrahydrofuran	25-140	1	3	T	25
	163	Ethyleneoxide	0.1-6%	1	3	-
Dipropylamine (CH3CH2CH2)2NH	180	Amines	4-80	1	3	T	-
	180L	Amines	0.35-7	1	2	T
Divinyl benzene C6H4(CH:CH2)2	124L	Styrene	1-15	3	3	-	10
Divinyl methoxysilane (CH2:CH2)2CH3OSi	113L	Isopropyl alcohol	2.5-40	2	3	T	-

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