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CaSi is a poorly soluble material. The Transformation/Dissolution T/D protocol applicable for poorly water soluble substances, and in particular metals and metalloids, has been performed on CaSi for a period of 28 days representing potential chronic effects. CaSi appears not to contain any impurities at concentrations that may be expected to cause chronic toxicity to aquatic organisms and therefore they do not require any further ecotoxicity tests for classification purposes (see section 4.23).