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Si/FeSi silicate is a poor soluble substance. The Transformation/Dissolution T/D protocol applicable for poorly water soluble substances, and in particular metals and metalloids, has been performed on Si/FeSi silicates for a period of 7 and 28 days representing potential acute and chronic effects respectively. Si/FeSi silicate appears not to contain any impurities at concentrations that may be expected to cause acute or chronic toxicity to aquatic organisms and therefore they do not require any further ecotoxicity tests for classification purposes.