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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Hydrolysis

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
hydrolysis
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is highly insoluble in water
Justification for type of information:
In accordance with column 2 of REACH Annex VIII, further degradation testing (required in section 9.2) shall be considered if the chemical safety assessment according to Annex I indicates the need to investigate further the degradation of the substance.
The chemical safety assessment does not indicate a need for further investigation as Synthetic wollastonite is inorganic and considered to be poorly soluble.
Reason / purpose for cross-reference:
data waiving: supporting information
Reason / purpose for cross-reference:
data waiving: supporting information
Reason / purpose for cross-reference:
data waiving: supporting information
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

In accordance with column 2 of REACH Annex VIII, further degradation testing (required in section 9.2) shall be considered if the chemical safety assessment according to Annex I indicates the need to investigate further the degradation of the substance.
The chemical safety assessment does not indicate a need for further investigation as Synthetic wollastonite is inorganic and considered to be poorly soluble.


Furthermore, information generated on the substance silicon dioxide concluded that it is not possible to quantify the very limited hydrolysis involved in the dissolution of silicates in water.

Key value for chemical safety assessment

Additional information

Based on the results of the study performed with silicon dioxide, it can be stated that although ion exchange processes are possible, depending on the surrounding environment, the degree of hydrolysis involved in the dissolution of silicates in water is very limited and not quantifiable.