Registration Dossier
Registration Dossier
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EC number: 242-472-2 | CAS number: 18643-08-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Conclusion on classification
Classification relevant information:
Degradation
- Hydrolysis: << 2 min (EU method C.7; read across from CAS No. 5894-60-0)
- Biodegradation: inherently biodegradable (57% after 28 d and 65% after 60 d, OECD 301F)
Acute aquatic toxicity
Aquatic invertebrates
EC50 (48 h) > 100 mg/L (nominal, OECD 202, Daphnia magna)
Algae
ErC50 (72 h) > 31.8 mg/L (nominal, methanol as solvent) and > 29.5 mg/L (nominal, TBA as solvent), (OECD 201, Scenedesmus subspicatus) based on read across from CAS 16415-12-6
Chronic aquatic toxicity
Algae
ErC10 (72 h) ≥ 31.8 mg/L (nominal, methanol as solvent), ErC10 (72 h) = 20.91 mg/L (nominal, TBA as solvent) (OECD 201, Scenedesmus subspicatus) based on read across from CAS 16415-12-6
Classification according to CLP
Chloro(dimethyl)octadecylsilane (CAS 18643-08-8) hydrolyses rapidly (DT50 < 2 min, at pH 7 and 25 °C) to form the hydrolysis products octadecyldimethylsilanol and hydrochloric acid. The silanol hydrolysis product octadecyldimethylsilanol is not considered rapidly degradable. Acute toxicity data for the target substance itself is available for aquatic invertebrates, while acute and chronic data for aquatic algae is available for the analogue substance hexadecyl(trimethoxy)silane (CAS No. 16415-12-6). No acute or chronic hazard was indicated within the range of water solubility. Therefore chloro(dimethyl)octadecylsilane (CAS 18643-08-8) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 and further amendments (ATPs).
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