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ORGANIC AND INORGANIC GASES by FTIR Spectrometry: METHOD 3800, Issue 1, dated 15 March 2003 - Page 7 of 47

**TABLE 1. REPRESENTATIVE VOLATILE COMPOUNDS AND CHEMICAL DATA**
Compound /Synonyms	CAS# RTECS	Empirical or Molecular Formula	MW^{[t1 1]}	BP^{[t1 2]} (°C)	VP^{[t1 3]} @ 25°C (mmHg)	Exposure Limits (ppm) ^{[t1 4]},^{[t1 5]},^{[t1 6]} (ACGIH^{[t1 7]}/ NIOSH^{[t1 8]} / OSHA)
Aromatic hydrocarbons
Benzene /benzol	71-43-2 CY1400000	${\ce {C6H6}}$	78.11	80.1	95.2	0.5–C / Ca^{[t1 5]}/10, 25–C
o-xylene	95-47-6 ZE2450000	${\ce {C6H4(CH3)2}}$	106.7	144.4	6.7	100 / 100/ 100
m-xylene	108-38-3 ZE2275000	${\ce {C6H4(CH3)2}}$	106.7	139.1	8.4	100 / 100/ 100
p-xylene	106-42-3 ZE2625000	${\ce {C6H4(CH3)2}}$	106.7	138.4	8.8	100 / 100/ 100
Styrene	100-42-5 WL3675000	${\ce {C6H5CH=CH2}}$	104.2	145	5	20 / 50 /100, 200–C
Toluene /toluol	108-88-3 XS5250000	${\ce {C6H5CH3}}$	92.1	110.6	28.4	50 / 100/ 200, 300–C
Alphatic Hydrocarbons
n-Hexane /hexyl-hybride	110-54-3 MN9275000	${\ce {C6H14}}$	86.18	68.7	151.3	50 / 50
Ketones
Acetone /2-propanone	67-64-1 AL3150000	${\ce {C3H6O}}$	58.08	58	232	500 / 250
2-Butanone /methyl ethyl ketone	78-93-3 EL6475000	${\ce {C4H8O}}$	72.11	79.6	95	200 / 200
Alcohols
Methanol /methy alcohol	67-56-1 PC1400000	${\ce {CH3OH}}$	32.04	64.5	95	200 / 200
Halogenated Hydrocarbons
Methylene chloride /dichloromethane	75-09-2 PA8050000	${\ce {CH2Cl2}}$	84.94	40	349	50 / Ca^{[t1 5]}
Vinylidene Fluoride /1,1 difluoroethene	75-38-7 KW0560000	${\ce {F2C=CH2}}$	64	-85	498.9	NA^{[t1 6]} / 1
Trichloroethylene /TCE	79-01-6 KX4550000	${\ce {ClCH=CCl2}}$	131.4	87	73.5	50 / Ca^{[t1 5]}

NIOSH Manual of Analytical Methods, Fourth Edition

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