Registration Dossier
Registration Dossier
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EC number: 237-623-4 | CAS number: 13870-28-5
Endpoint summary
Administrative data
Description of key information
Additional information
The crystalline structure of layered delta-sodium disilicate is completely destroyed by dissolution in water yielding an aqueous solution which is identical to a solution of amorphous sodium disilicate (CAS No. 1344-09-8). Upon dilution of concentrated commercial amorphous sodium silicate solutions with water, the highly cross-linked polysilicate ions depolymerise rapidly to monosilicate ions. The resulting water glass is identical to naturally occurring silicate. Thus, it can be concluded that disodium disilicate (delta-crystalline) is degraded hydrolytically to a naturally occurring substance, which is widespread in nature.
Tests on biodegradation do not need to be conducted as the test substance disodium disilicate (delta-crystalline) is an inorganic substance. Identification of degradation products does not need to be conducted as disodium disilicate (delta-crystalline) can be regarded as readily degradable in nature. No other degradation products than water glas are to be expected.
Disodium disilicate (delta-crystalline) is expected to have a low potential for bioaccumulation and also a low potential for adsorption to soil (log Kow expected to be < 0 as the substance is not soluble in octanol).
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