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Hazard for aquatic organisms

Hazard for air

Hazard for terrestrial organisms

Hazard for predators

Additional information

Conclusion on classification

Classification relevant information:

Degradation:

Hydrolysis: < 1 min at pH 4-9 and 1.5 °C (OECD 111)

Biodegradation: not readily biodegradable (1% after 28 d and 0% after 60 d, OECD 310)

 

Bioaccumulation:

Trichloro(4-methylphenyl)silane: not relevant due to fast hydrolysis

Silanol hydrolysis product (4-methylphenyl)silanetriol:

·        Log Kow = -0.6 (QSAR)

·        BCF = 0.91 – 3.16 L/Kg (QSAR, EPI Suite v4.1, BCFBAF models)

 

Aquatic acute toxicity

Aquatic invertebrates: EC50 (48 h) > 100 mg/L (nominal, OECD 202, Daphnia magna) based on read across from CAS 98-13-5

Algae/aquatic plant: ErC50 (72 h) > 100 mg/L (nominal, OECD 201, Pseudokirchneriella subcapitata) based on read across from CAS 98-13-5

 

Aquatic chronic toxicity

Fish: no data available

Aquatic invertebrates: no data available

Algae/aquatic plant: NOErC (72 h) ≥ 100 mg/L (nominal, OECD 201, Pseudokirchneriella subcapitata) based on read across from CAS 98-13-5

 

Classification according to CLP

Trichloro(4-methylphenyl)silane (CAS 701-35-9) hydrolysis vigorously to (4-methylphenyl)silanetriol and hydrochloric acid. The silanol hydrolysis product is not considered to be rapidly degradable and the calculated BCF is clearly < 500 L/kg. Acute toxicity data are available for three trophic levels (fish, aquatic invertebrates and algae) while chronic data are available for algae. No acute or chronic hazard was identified. Therefore trichloro(4-methylphenyl)silane (CAS 701-35-9) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 and further amendments (ATPs). 

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