Registration Dossier

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information

Additional information

The chemical intermediate "Dioxy Cuite Brute 58%" named "DCB" is a mixture of molecules and mainly composed of 4,4'-sulfonyldiphenol (BPS) and other sulfonated phenol sodium salts (from phenol sulfonic acidand phenol: see section 1.2 of the dossier for the detailed composition).

Data of the intermediate is reported in the product information sheet:

It is a turbid liquid paste, with a pink to red colour at 20 °C.

DCB is soluble in water and a little amount of solvent. The grade of the salification of the components increases the solubility in water.

DCB is in a neutralized form. Therefore, its pH is approximately 7-8.

Some of the phys-chem properties can be estimated from the main component 4,4'-sulfonyldiphenol (BPS), present in the organic part of the intermediate at approximately 48%.

The melting point is 240.5 °C, and the boiling point could not be determined because the substance decomposes at > 315 °C.1 2 3

The vapour pressure of BPS is very low though a good solubility in water is expected, approximately 1 g/L.1 2 3

Measured values of partition coefficient, Kow, are in the range of 1.2-2.36.1 2 3

Measured dissociation constants, pKa, are 7.02 and 8.1 2 3

The flash point of BPS is >= 400 °C and the substance is not flammable.1 2 3


1ECHA Registration Dossier BPS CAS 80-09-1;

2SIDS INITIAL ASSESSMENT PROFILE, CAS 80-09-1, CoCAM 4, 16-18 April 2013;

3EPA, U. S. Environmental Protection Agency, Bisphenol A alternatives in thermal paper, Final Report, January 2014.