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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

dissociation constant
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is hydrolytically unstable (half-life less than 12 hours)

Description of key information

In accordance to annex IX, 7.16, dissociation constant has not been determined as half-life-time of captan in aqueous solution is found to be < 12 hours.

Key value for chemical safety assessment

Additional information

Dissociation and dissociation products have not been determined as half-life-time of captan in water is very low. Decomposition products are well known from registration of captan as active ingredient for pesticide products.