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EC number: 242-272-5
CAS number: 18395-30-7
Trimethoxy(2-methylpropyl)silane hydrolyses rapidly in contact with
water or atmospheric moisture (estimated 4.1 h at pH 7 and 25°C), to
produce (2-methylpropyl)silanetriol and
methanol. At the concentrations relevant to the assessmentmethanol
is understood to be non hazardous to aquatic organisms, further
considerations are given below. REACH guidance (ECHA 2010A, R.16) states
that “for substances where hydrolytic DT50 is less than
12 hours, environmental effects are likely to be attributed to the
hydrolysis product rather than to the parent itself”. TGD and REACH
guidance (EC 2003) and R.16 (2010A) also suggest that when the
hydrolysis half-life is less than 12 hours, the breakdown products,
rather than the parent substance, should be evaluated for aquatic
toxicity.Therefore, the environmental
hazard assessment (aquatic, sediment and soil) is based on the
properties of the silanol hydrolysis product, (2-methylpropyl)silanetriol,
in accordance with REACH guidance. As described in Section 1.3,
condensation reactions of the silanetriol are possible.
rapidly and the silanol hydrolysis product is not readily biodegradable.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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