Registration Dossier
Registration Dossier
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EC number: 296-473-8 | CAS number: 92704-41-1 The product of high temperature calcination (above 450°C (842°F)) of naturally occurring kaolin, a hydrated aluminum silicate, resulting in the evolution of water and the formation of new substances depending upon the calcination temperatures employed.
Long-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
A NOEC(10d) of 100 mg/L was determined for effects on hatching success, a NOEC(30d) of 300 mg/L was determined for negative effects on length and weight.
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Effect concentration:
- 100 mg/L
Additional information
For long-term toxicity to fish, one study is available on unspecified kaolin powder describing a bioassay on hatching success, growth and survival, and feeding behaviour of juvenile fish, using Oncorhynchus mykiss as test species (Hashimoto et al. 1986). The study revealed a 10-d NOEC value of 100 mg/L for hatching success. The survival and growth study on juvenile fish showed a NOEC(30d) of 100 mg/L for mortality and a NOEC(30d) of 300 mg/L for effects on length and weight. A NOEC(30 min) of 10 mg/L was determined, indicating reduced feeding of juvenile fish at higher concentrations.
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