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Registration Dossier
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EC number: 268-103-5 | CAS number: 68002-88-0 This substance is identified by SDA Substance Name: C16-C22 alkyl carboxylic acid and SDA Reporting Number: 21-005-00.
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
The vapour pressure is 5.06E-5 Pa at 25 °C.
Key value for chemical safety assessment
Additional information
The key value for vapour pressure is estimated by using a category approach based on the available data two main constituents, C16 Palmitic acid (CAS 57-10-3) and C18 Stearic acid (CAS 57-11-4). C16 Palmitic acid had the higher vapour pressure of these two constituents (see explanation below). An experimental value for Fatty acids, C16-22 is available, but it was determined less precisely (vapour pressure < 1 Pa).
According to the theoretical principle of Raoult’s law, the vapour pressure of a mixture is equal to the mole-fraction-weighted sum of the components' vapour pressures:
ptot= ∑ pixi
The vapour pressure of the mixture should be lower than the vapour pressure of the component which has the highest vapour pressure in its pure form (C16).
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