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.
Endpoint summary
Administrative data
Description of key information
Additional information
Concerning aquatic short-term toxicity effects, tests for representatives of each trophic level (fish, Daphnia, algae) are available. The test results with structurally related compounds presented hereby confirmed that the toxicity profile of Kaolin, calcined for aquatic species is of low concern. For algae, an EC50 could be determined at 410 mg/L (growth), while for fish and Daphnia LC50/EC50 values were stated as >100 mg/L due to the test design (limit test). However, the LC50/EC50 values of all species are above 100 mg/L, which is far higher than the solubility of the substance in water.
Also long-term toxicity data are available for representatives of each trophic level (fish, Daphnia and algae) in tests with structurally related compounds. The most sensitive species were algae with an EC10 value of 41 mg/L (growth rate).
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