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Toxicity to terrestrial plants

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Waiving of studies:
In accordance with column 2 of REACH Annex IXand X, studies on short- and long- term toxicity to plants (required in section 9.4.3 and 9.4.6) can be waived as the results of the chemical safety assessment do not indicate the need to further investigate the effects of the substance and/or relevant degradation products on plants. The log Kow is expected to be < 0 and thus the potential for bioaccumulation is very low. The substance has no high potential to adsorb to soil and is not very persistent. In addition it was shown that disodium disilicate (delta-crystalline) is hydrolysed to water glass in aqueous solution which is identical to silicate. Therefore, it can be concluded that disodium disilicate (delta-crystalline) is hydrolytically degraded to a naturally occurring substance which is widespread in nature. In addition the concentration related silicate-release of disodium disilicate (delta-crystalline) is not expected to be significantly higher than natural fluctuations in silicate levels. Thus, short- and long-term effects are not expected and consequently, short and long-term toxicity testing is not necessary.

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