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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

Type of composition:
legal entity composition of the substance
State / form:
Reference substance:
PBT status:
the substance is not PBT / vPvB

Dichloro(methyl)(vinyl)silane rapidly hydrolyses in the presence of water to methyl(vinyl)silanediol and hydrogen chloride. Hydrogen chloride is inorganic and the PBT/vPvB criteria are not applicable. Methyl(vinyl)silanediol was found to be not readily biodegradable in a standard reliable ready biodegradability test. Therefore, the substance meets the criteria for persistence (P).

According to hydrolysis effect, the substance will not bioaccumulate. The hydrolysis product, methyl(vinyl)silanediol has a

predicted log Kow of -0.05 and, therefore, is considered not likely to bioaccumulate. Therefore, the substance does not meet the criteria for bioaccumulation; it is not B and not vB.

The substance is not classified for long-term human health effects. The substance is not classified for aquatic toxicity, on the basis of L(E)C50 values for fish, Daphnia and algae read-across from a related substance. Therefore, the substance does not meet the criteria for toxicity; it is not T.

Conclusion : The substance hydrolyses rapidly in the presence of water; the hydrolysis product methyl(vinyl)silanediol may persist in the environment and meets the P criteria. However, it does not meet the criteria for B or T.

Therefore, the substance does not meet the criteria for PBT or vPvB.