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Physical & Chemical properties

Stability: thermal, sunlight, metals

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Description of key information

Key study: Corrosion to metals: According to UN Manual of Tests and Criteria, Part III, Section 37.4. The corrosion rate of steel and aluminium is below 6,25 mm/a (= 13,5% loss of weight during 168 h), therefore trichloroacetic acid must not be classified as H290.

Additional information

Key study: Corrosion to metals: According to UN Manual of Tests and Criteria, Part III, Section 37.4. The corrosion rate of steel and aluminium is below 6,25 mm/a (= 13,5% loss of weight during 168 h), therefore trichloroacetic acid must not be classified as H290.

Supporting studies:

Thermal: Simulating a real fire, combustion at 950°C under good air supply gave hydrogen chloride (HCl) as hazardous decomposition product and sodium oxide; phosgene only in traces of 0.1 mg/g trichloroacetic acid. Trichloroacetic acid decomposes by heating with caustic alkalies into chloroform and alkali carbonate; decomposition products are chloroform, hydrochloric acid, carbon dioxide and carbon monoxide.

Sunlight: Trichloroacetic acid does not contain chromophores that absorb at wavelengths >290 nm and therefore is not expected to be susceptible to direct photolysis by sunlight.

Metals: The reaction of trichloroacetic acid with copper wool in DMSO leads to a volatile exothermic reaction. Contact with metals may evolve flammable hydrogen gas.

Justification for classification or non-classification

The corrosion rate of steel and aluminium is below 6,25 mm/a (= 13,5% loss of weight during 168 h), therefore trichloroacetic acid must not be classified as H290.