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EC number: 617-969-6 | CAS number: 87135-01-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water: screening tests: 74% biodegradation in 28 days.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable but failing 10-day window
Additional information
The key study is the only biodegradation study available for the substance. In a test conducted in accordance with OECD 301B (CO2 Evolution Method) and in compliance with GLP, 1,6 -bis(trimethoxysilyl)hexane attained 74% degradation in 28 days but failed to meet the 10-day window criterion (Harlan Laboratories Ltd, 2009). According to the strict interpretation of the OECD Test Guideline the substance is therefore not considered to be readily biodegradable but has exhibited the potential for rapid biodegradation.
1,6-Bis(trimethoxysilyl)hexane (CAS No. 87135-01-1) hydrolyses within the timescale of the ready biodegradation study (5.2 hours at 25.1°C) to 1,6-Bis(trihydroxysilyl)hexane and methanol. The biodegradation observed in the study is mainly attributable to the biodegradation of the methanol hydrolysis product. Methanol is readily biodegradable (OECD, 2004). No significant biodegradation is expected for the silanol hydrolysis product.
OECD (2004): SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18-20 October 2004, Methanol, CAS 67-56-1.
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