Registration Dossier
Registration Dossier
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EC number: 442-070-9 | CAS number: 329039-38-5
Endpoint summary
Administrative data
Description of key information
Additional information
Methyldiacetoxyisopropoxy silane (CAS No. 329039-38-5) shows potential for volatilization in air (vapour pressure = 199 Pa at 25°C). Nevertheless, this substance is not expected to be accumulated and further transported through the atmospheric compartment since it is susceptible to undergo indirect photodegradation in air (DT50 = 31 hours, AOPWIN v1.92). If released into the water phase, methyldiacetoxyisopropoxy silane will rapidly hydrolyze (DT50 < 4 h), being the main metabolites (based on its chemical structure) methylsilanetriol (CAS No. 2445-53-6), acetic acid (CAS No. 64-19-7) and isopropanol (CAS No. 67-63-0). The results from the biodegradation screening study show that methyldiacetoxyisopropoxy silane is moderately biodegradable (59% biodegradation in 28 days). However, since the substance is hydrolytically unstable, these results correspond rather to the biodegradation of the hydrolysis products. Two of the main degradation products, isopropanol and acetic acid are known to be readily biodegradable (OECD SIDS, 1997; HSDB, 2011) and therefore, methylsilanetriol is expected to be the metabolite showing low to moderate potential for biodegradation. Methyldiacetoxyisopropoxy silane and its main degradation products show no potential for adsorption to soil and sediment particles, based on log Pow values < 3.
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