Registration Dossier
Registration Dossier
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EC number: 274-936-5 | CAS number: 70851-50-2
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:
- Biodegradation: inherently biodegradable (57% after 28 d and 65% after 60 d, OECD 301F) based on read across from CAS 18643-08-8
- Hydrolysis: half-life approx. 2.6 h at 20-25 °C and pH 7 (QSAR)
Bioaccumulation:
- Dimethoxymethyloctadecylsilane (CAS 70851-50-2): not relevant due to fast hydrolysis
- Silanol hydrolysis product: Octadecylmethylsilanediol
Log Kow = 7.9 at 20°C (QSAR)
BCF = 201.5 - 1165 L/kg (BCFBAF v3.01, QSAR)
Aquatic acute toxicity:
- Fish: no data available
- Aquatic invertebrates: EL50 (48 h) > 100 mg/L (nominal, OECD 202, Daphnia magna)
- Algae/aquatic plant: 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
Aquatic chronic toxicity:
- Fish: no data available
- Aquatic invertebrates: NOEC (21 d) ≥ 10 mg/L (nominal, OECD 211, Daphnia magna) based on read across from CAS 16415-12-6
- Algae/aquatic plant: ErC10 (72 h) ≥ 31.8 mg/L (nominal, methanol as solvent) and 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
Dimethoxymethyloctadecylsilane (CAS 70851-50-2) hydrolyses to octadecylmethylsilanediol and methanol. The silanol hydrolysis product is not considered rapidly degradable. Acute toxicity data are available for two trophic levels (aquatic invertebrates and algae). No effects causing 50% mortality to aquatic invertebrates (EL50) or 50% inhibition to growth rate (ErC50) for aquatic algae were detected up to the limit of water solubility. Chronic aquatic toxicity data indicate no hazard within the range of water solubility. Therefore, dimethoxymethyloctadecylsilane (CAS 70851-50-2) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 and further amendments (ATPs).
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