Registration Dossier
Registration Dossier
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EC number: 442-070-9 | CAS number: 329039-38-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.931 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 9.31 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.093 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 10 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 3.53 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.353 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 6.83 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
Classification related key information
Biodegradation in water: screening tests: 59% in 28 days (DOC Die Away test)
Bioaccumulation: Log Kow ≤ 3
Aquatic acute toxicity:
Fish: LC50 (96 h)(Oncorhynchus mykiss): 1517 mg/L (nominal)
Aquatic invertebrates: EC50 (48 h)(Daphnia magna): > 1000 mg/L (nominal)
Algae: EC50 (72 h)(Scenedesmus subspicatus): 931.3 mg/L (nominal)
Chronic toxicity:
Not available
Non-classification justification according to CLP and DSD
Based on the data above, methyldiacetoxyisopropoxy silane (CAS No. 329039-38-5) is considered to be moderately biodegradable and has low potential for bioaccumulation. The acute aquatic toxicity data available showed no (aquatic invertebrates) or only low toxicity (fish and algae) to aquatic organisms, being the lowest effect concentration EC50 (72 h) = 931.3 mg/L (Scenedesmus subspicatus). Considering this information, methyldiacetoxyisopropoxy silane does not need to be classified and labelled as environmental hazard according to Regulation (EC) No. 1272/2008 (CLP), Regulation (EC) No. 286/2011 (2nd ATP) and Directive 67/548/EEC.
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