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Physical & Chemical properties

Vapour pressure

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vapour pressure
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Description of key information

The volatility of Fatty acids, C8-10, zinc salts is considered to be negligible.

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 10-5 Pa. Fatty acid, C8-10, zinc salts are solid substances containing octanoic acid, zinc salt [56.6 %] and decanoic acid, zinc salt [43.0 %] (salts of an organic acid and an inorganic cation) with a melting point at 120 °C. In view of this, the volatility of this substance can therefore be safely assumed to be low. For purposes of comparison, the HSDB lists for the organic acid moieties the following vapour pressure data: 4.94 x 10-1 Pa (3.71 x 10-3 mm Hg) at 25 °C for octanoic acid and 4.88 x 10-2 Pa (3.66 x 10-4 mm Hg) at 25 °C for decanoic acid (Daubert and Danner, 1989). In consideration of the “salt” nature of this inorganic compound, it can therefore be anticipated that the vapour pressures of Fatty acid, C8-10, zinc salts are well below the value for the organic acid, and thus negligible. Therefore, in accordance with Regulation (EC) No 1907/2006, Annex XI, sections 1 & 2, 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