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.
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
Acute toxicity testing with fish resulted in a key LC50(96h) value of > 100 mg/L in a study conducted according to OECD 203.
Key value for chemical safety assessment
Marine water fish
Marine water fish
- Effect concentration:
- 70 000 mg/L
Additional information
Two studies on the toxicity to freshwater fish are available on structurally related compounds as well as two studies on the toxicity to brackish water fish species.
In the key study, the substance FCC Katalysator was tested for effects on Danio rerio in a limit test (control and 100 mg/L) under static conditions according to OECD guideline 203. The test resulted in an LC50(96h) value of > 100 mg/L, with a NOEC of >= 100 mg/L (Rudolf 2007).
The supporting study tested the effects of a catalyst (FCC Futura) to Danio rerio according to OECD 203 under static conditions using concentrations of 100 to 10000 mg/L. The test resulted in an LC0(96h) of >= 10000 mg/L (Weyandt and Lebertz 1998).
Two tests on brackish water species Parophrys vetulus (English sole) and Fundulus heteroclitus (mummichog) are available, tested with kaolin (hydrite Flat D) and kaolin Hydrite-10, respectively. Parophrys vetulus was tested in a flow-through system at concentrations of 10000 to 117000 mg/L, resulting in an LC50 value of 70000 to 117000 mg/L, with no mortality at 70000 mg/L and 80% mortality at 117000 mg/L (McFarland and Peddicord 1980). Fundulus heteroclitus was tested in a static test which resulted in an LC50(48h) of > 140000 mg/L (Sherk et al. 1973).
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