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Physical & Chemical properties

Partition coefficient

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Description of key information

Partition coefficient (LogPow): 1.59.as hexahydrophthalic anhydride
Partition coefficient (LogPow): -0.31.as hexahydrophthalic acid (non-ionized)
Partition coefficient (LogD): -4.14.as hexahydrophthalic acid (ionized, environmental conditions)

Key value for chemical safety assessment

Log Kow (Log Pow):
-4.14
at the temperature of:
20 °C

Additional information

Partition coefficients have been investigated using methods in accordance with accepted OECD/EU test and in-silico methods.

A LogPow of 1.59 was determined for cyclohexane-1,2-dicarboxylic anhydride (HHPA)

A LogPow of -0.31 was estimated for hexahydrophthalic acid (HHPAc)

Considering all the charge-state forms of hexahydrophthalic acid dissolved in water and in octanol, a LogD (distribution coefficient) was estimated taking account for the pH dependence of the substance in aqueous solution.

HHPA is hydrolysed practically instantaneously to HHPAc, then for the environmental and PBT assessments, the acid form was considered more significant, with logD= -4.14.