Registration Dossier
Registration Dossier
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EC number: 201-251-0 | CAS number: 80-10-4
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- Dichloro(diphenyl)silane
- Type of composition:
- boundary composition of the substance
- State / form:
- liquid
- Reference substance:
- Dichloro(diphenyl)silane
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Persistence Assessment
Dichloro(diphenyl)silane (CAS 80-10-4) rapidly hydrolyses in the environment (half-life = 10 sec at 1.5 °C and pH 7) and the hydrolysis products diphenylsilanediol and hydrochloric acid are formed. Therefore, the substance is not persistent (not P/vP).
Bioaccumulation Assessment
Due to the very rapid hydrolysis of the target substance bioaccumulation is not expected for this compound. However, due to the fast hydrolysis of the parent substance (DT50 = 10 sec at 1.5 °C and pH 7), the hydrolysis products diphenylsilanediol and hydrochloric acid are relevant for the assessment. The hydrolysis product diphenylsilanediol has a low log Kow value (log Kow = 2) and, therefore, is unlikely to bioaccumulate (log Kow < 3). The second hydrolysis product, hydrochloric acid, is an inorganic substance, therefore bioaccumulation is not applicable to this hydrolysis product.
Therefore, the substance does not meet the criteria for bioaccumulation; it is not B and not vB.
Toxicity Assessment
No acute aquatic data is available for the target substance dichloro(diphenyl)silane. Since the target substance rapidly hydrolysis in the aquatic environment to the hydrolysis products diphenylsilanediol and hydrochloric acid (DT50 = 10 sec, at pH 7 and 1.5 °C, OECD 111). Based on ECHA guidance R.16 (ECHA, 2016), the breakdown products rather than the parent substance should be assessed for aquatic toxicity when the hydrolysis half-life is below 12 h. Thus, a read-across to the hydrolysis product diphenylsilanediol (CAS No. 947-42-2) was conducted, as the second hydrolysis product hydrochloric acid (CAS No. 7647-01-0) generally shows a pH-dependent environmental hazard profile, which is considered sufficiently manageable risk when appropriate measures are in place (OECD, 2002). For the source substance diphenylsilanediol (CAS No. 947-42-2) a NOEC (72 h) = 1.1 mg/L (measured (arithmetic mean), OECD 201) was obtained. Therefore, the screening criteria according to Annex XIII of the REACH regulation EC 1907/2006 were not met (NOEC ≥ 0.01 mg/L) and the substance is not classified as T.
Furthermore, neither the substance nor its hydrolysis products are classified for specific target organ toxicity, carcinogenicity, mutagenicity and is not toxic for reproduction and development towards mammals. The criteria for “T” based on mammalian effects are therefore not met.
In conclusion, based on ECHA guidance R.11, the substance does not meet the overall criteria for PBT or vPvB.
Reference
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