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PBT assessment

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PBT assessment: overall result

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

Persistence assessment:

Biodegradation in water: screening test: The substance is not ready biodegradable.

Hydrolysis: The substance is hydrolytically unstable in water. The half-life is expected to be < 1 hour at 25 ºC and therefore, the substance is not persistent.

Conclusion on P / vP properties: The substance is not fulfilling the criteria for Persistence (P).

Bioaccumulation assessment:

The substance undergoes rapid hydrolysis in aqueous to acetone oxime and the corresponding silanols. At the same time, silanols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable.

It should be also taken into account that the estimated log octanol-water partition coefficients (Log Kow) for the degradation products acetone oxime and silanols are 1.20 and -2.36 (EPI-Suite, KOWWIN v1.68). Since being the log Pow <3, they are expected to of low bioaccumulation.

Based on the available information, the test item is determined to have low bioconcentration potential based on the properties of its degradation products.

Conclusion on B / vB properties: The substance is not fulfilling the criteria for Bioaccumulation (B).

Toxicity assessment:

There is no long-term toxicity studies available with fish and crustacea.

Toxicity to aquatic algae: NOEC (72h) > 100 mg/L (basis for effect: growth rate).

Moreover, regarding the acute aquatic toxicity:

- Short-term toxicity to fish: LC50 (96h) > 100 mg/L (based on mortality).

- Short-term toxicity to aquatic invertebrates: EC50 (48h) > 100 mg/L (based on mobility).

- Toxicity to aquatic algae: EC50 (72h) > 100 mg/L (based on growth rate).

The substance is not classified as CMR nor STOT RE.

Conclusion on T properties: The substance is not fulfilling the criteria for Toxicity (T).


The substance is not a PBT or vPvB substance.