Registration Dossier
Registration Dossier
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EC number: 270-451-8 | CAS number: 68440-34-6
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
negligible volatility
Key value for chemical safety assessment
Additional information
The vapour pressure of a substance is defined as the saturation pressure above a solid or liquid substance. In EU method A.4, seven different measuring methods are listed for the measurement of the vapour pressure of solids and liquids. However, the vapour pressure does not need to be measured due to technical reasons if calculations indicate that the value is significantly less than 10-5Pa. Fatty acid, tallow, zinc salts (CAS No. 68440-39-6) is a solid substance (salt of fatty acids and an inorganic cation) with a melting point at 101-121 °C. In view of this, the volatility of this substance can therefore be safely assumed to be negligible, i. e. below the level of relevance (10-5Pa). For purposes of comparison, the HSDB lists for the fatty acid moiety a vapour pressure of 5.7X10-6 Pa (4.28X10-8 mm Hg) at 25°C for stearic acid. In consideration of the salt nature of this compound, it can therefore be anticipated that the vapour pressures of Fatty acid, C16-18, zinc salts are well below the value for the fatty acids, and thus negligible.
Therefore, in accordance with Annex XI, sections 1 and 2 of Regulation (EC) No 1907/2006, testing does not need to be conducted for technical as well as for scientific reasons.
[Daubert, T. E., R. P. Danner. Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. Washington, D. C.: Taylor and Francis, 1989. ] **PEER REVIEWED** in Hazardous Substances Data Bank via TOXNET at http: //toxnet. nlm. nih. gov
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