Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

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).