Registration Dossier
Registration Dossier
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EC number: 457-670-6 | CAS number: 157859-20-6
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.003 mg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.014 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0 mg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 76 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.042 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.004 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:
- 0.007 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential to cause toxic effects if accumulated (in higher organisms) via the food chain
Additional information
The registered substance tri(isopropyl)silyl acrylate (TIPSA) will hydrolyse extremely rapidly (see section 5.1.2 of IUCLID) to yield tris(1-methylethyl)silanol (TIPSOH) and acrylic acid (propenoic acid; CAS No. 79-10-7). Exposure in the semi-static and static short-term aquatic toxicity tests will therefore be predominantly to these hydrolysis products.
Tris(1-methylethyl)silanol has a predicted water solubility of 60 mg/l at 20°C and acrylic acid is reported to be miscible in water 25°C (see section 4.8 of IUCLID).
The silanol hydrolysis product (tris(1-methylethyl)silanol) has a predicted log Kow of 3.9 at 20°C.
Acrylic acid has a log Kow value of 0.46 at 25°C (see section 4.7 of IUCLID).
In view of the very rapid hydrolysis of tri(isopropyl)silyl acrylate the PNEC values are calculated for the hydrolysis products tris(1-methylethyl)silanol and acrylic acid. The PNECs for tris(1-methylethyl)silanol are based on the study data summarised in this chapter.
Acrylic acid (propenoic acid; CAS No. 79-10-7) has been the subject of a REACH dissemination report and the PNEC values derived in this report are used in this assessment.
Conclusion on classification
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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