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EC number: 946-149-3 | CAS number: 1571954-81-8
The method is based on the estimation of the mass of test substance flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of
effused vapour can be obtained either by determining the loss of mass of the cell or by condensing the vapour at low temperature and determining the amount of volatilized substance using chromatography.
The vapour pressure is calculated by applying the Hertz-Knudsen relation with correction factors that depend on parameters of the apparatus. The recommended range is 10-10 to 1 Pa.
The evaporation rate was measured under high vacuum at 25 °C (298 K), 50 °C (323 K), 80 °C (353 K) and the weight loss was estimated to be vapour loss. The vapour pressure was calculated by Hertz-
The vapour pressure of GL500 was determined to be 2.62 x 10-6 Pa at 25 °C (298 K), 5.30 x 10-6 Pa at 50 °C (323 K) and 2.83 x 10-5 Pa at 80 °C (353 K), respectively.
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