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Description of key information

TCPP is hydrolytically stable, with an estimated half life of more than 1 year at 25 degree C.

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

"Should read >1 year at 25 °C"

Preliminary hydrolysis testing was undertaken at 50ºC for five days. A decrease in concentration of less than 1% was observed at pH 4, 7 and 9. Based on this result, it is concluded that TCPP is stable in water with a half-life greater than or equal to one year. It is discussed in the European Union Risk Assessment Report of tri(2 -chloro-1-methylethyl) phosphate the main compound of TCPP, that phosphate esters are known to hydrolyse, although this is expected to be slow under environmentally relevant conditions (Gerlt (1992). A not assignable source describes the two known mechanisms for non-enzymatic hydrolysis of phosphate esters, and reviews enzymatic catalysis relevant to biological systems are described (Gerlt, 1992). No information on rates is given, and discussion is general only. It is assumed that it is very unlikely, that the rate of hydrolysis at environmentally-relevant pH values is fast enough to have any influence on predicted environmental concentrations.

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