National Industrial Chemicals Notification and Assessment Scheme

3.Applicants

4.Chemical Identity

*Trademark of The Dow Chemical Company

5.Physical and Chemical Properties

5.1Physico-chemical properties

Property Value Reference

Physical state clear, colourless or blue HSDB,1998 mobile liquid

Odour ethereal, chloroform-like HSDB,1998

Odour threshold 100 ppm ATSDR, 1993

Molecular weight 131.40 HSDB,1998

Boiling point 86.7C ATSDR,1993

Melting point -86.5°C UK SIAR,1996

Surface tension 0.0293 N/m HSDB,1998

Density at 20°C 1.465 g/ml HSDB,1994

Vapour density 4.53 HSDB,1994

Vapour pressure at 20°C 7.7 kPa HSDB,1994

Water solubility at 20C 1.07 g/L ATSDR,1993

Flash point None ATSDR,1993

Autoignition temperature 410°C UK SIAR, 1996

Flammability limits at 25°C 8.0-10.5% in air ATSDR,1993

Decomposition temperature > 125°C NIOSH,1973

Partition coefficients

Log Kow 2.42 ATSDR,1993

Log Koc 2.03-2.66 ATSDR,1993

Conversion factors ATSDR,1993

Air at 20°C 1 mg/m3 = 0.18 ppm

1 ppm = 5.46 mg/m3

Water 1 ppm (w/v) = 1 mg/L

1 ml/m3 = 1.465 mg/L

5.2Decomposition products

Trichloroethylene decomposes under a number of environmental conditions, including:

in the presence of oxygen and ultraviolet light it undergoes auto-oxidation with the formation of acidic products such as hydrogen chloride;

at high temperatures it decomposes to form phosgene and hydrogen chloride; and

in the presence of moisture, dichloroacetic acid and hydrochloric acid are formed. These products are highly corrosive and react with many metals.

Other decomposition products formed are carbon monoxide, trichloroethylene ozonides and trichloroethylene epoxide.

5.3Reactivity

In contact with finely divided or hot metals, such as magnesium and aluminium at very high temperatures (300-600°C) it decomposes readily to form phosgene and hydrogen chloride. Such conditions are seen in the vicinity of arc welding and degreasing operations. Aluminium is more reactive than magnesium.

In the presence of strong alkalis such as sodium hydroxide, dichloroacetylene, which is explosive and flammable, is formed.

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