TABLE 12-1 Physical and Chemical Data on Xylene

Synonyms and trade names

Dimethylbenzene (1,2-, 1,3-, or 1,4-); xylol; m-xylene (m-isomer); o-xylene (o- isomer); p-xylene (p- isomer); methyl toluene

CAS registry number

1330-20-7

108-38-3 (m- isomer)

95-47-6 (o- isomer)

106-42-3 (p- isomer)

Molecular formula

C8H10

Molecular weight

106.16

Boiling point

137-140°C

Melting point

No data on mixture

−47.4°C (m- isomer)

−25°C (o- isomer)

13-14°C (p- isomer)

Flash point

29 °C

Explosive limits

NA

Specific gravity

0.864 at 20°C/4°C

Vapor pressure

6.72 mm Hg at 21°C

Solubility

Practically insoluble in water; miscible with absolute alcohol, ether, many other organic liquids

Conversion factors

1 ppm = 4.34 mg/m3; 1 mg/m3 = 0.23 ppm

Abbreviations: NA, not available or not applicable.

Sources: Vapor pressure from ATSDR 1995; specific gravity from HSDB 2005; all other data from Budavari et al. 1989.

air and 1-10 ppb in indoor air. Major sources of xylene in outdoor air are emissions from vehicles, chemical plants, and paints. Sources in indoor air are cigarette smoke and consumer products. Xylene has been detected in some foods.

Sources of xylene in a submarine are paints and coatings (Crawl 2003). Holdren et al. (1995) reported the results of air sampling at three locations conducted over 6 h during the missions of two submarines. Data were provided on p-xylene and o-xylene. Sampling indicated concentrations of p-xylene of 15.6-20.2 ppb in one submarine, depending on the collection method and location, and concentrations of 7.5-12 ppb in the other submarine, depending on the collection method and location. Concentrations of o-xylene ranged from 28.5 to 38.6 ppb, depending on the collection method and location on one submarine, and from 6.3 to 16 ppb on the other submarine, depending on the collection method and location. Raymer et al. (1994) reported the results of a similar sampling exercise (two submarines, three locations, and sampling duration of 6 h).



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