Registration Dossier
Registration Dossier
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EC number: 233-135-0 | CAS number: 10043-01-3
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the melting point is above 300°C
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
In accordance with column 2 of REACH Annex VII, the vapour pressure study does not need to be conducted as the substance has a melting point above 300°C (please refer to section 4.2).
Reference
Description of key information
Aluminium sulphate has negligible vapour pressure.
Key value for chemical safety assessment
- Vapour pressure:
- 0.001 Pa
- at the temperature of:
- 20 °C
Additional information
No experimental study is deemed necessary: based on the properties of the substance (solid with mp > 300°C) the vapour pressure is expected to be very low, and likely below the measurable range (10E-10 Pa).
However, a key value is required for purpose of CSA. As no realistic value can be provided, an arbitrary value of 0.001 Pa is proposed, in order to lie below the lower threshold of 0.01 Pa used by the risk assessment model.
Additionally, for purpose of risk assessment, an estimation of the VP at 100°C is also needed. The present substance has a high melting point. Published literature data (HSDB / CRC handbook 81st ed.) is available for the analogue Aluminium chloride, which has a lower molecular weight, allowing to interpolate a VP of ca 127 Pa at 100°C. Therefore it seems reasonable to use the volatility band of < 500 Pa for the Tier 1 assessment.
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