Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Reaction Mass of 3,3-diphenylhexamethyltrisiloxane and 3,3,5,5-tetraphenylhexamethyltetrasiloxane hydrolyses to trimethylsilanol and diphenylsilanediol with a hydrolysis half-life of greater than 48 hours. Therefore, the environmental hazard assessment is based on the properties of the parent substance in accordance with REACH guidance for Chemical Safety Assessment (Chapter R.16; ECHA, 2016).

Trimethylsilanol and diphenylsilanediol are the expected final products of hydrolysis reactions for both constituents under the conditions of a hydrolysis laboratory study. However, other biotic or abiotic reactions may occur over longer time-scales in the environment.

Reference:

ECHA (2016). REACH Guidance on Information Requirements and Chemical Safety Assessment Chapter R16: Environmental Exposure Assessment Version: 3.0. February 2016

Additional information