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EC number: 202-384-7
CAS number: 95-02-3
All measured values show good
reproducibility, giving relative standard deviations of less than 20% at
temperatures from 45°C and above, and good correlation. The test item
consists of a single substance with 81% purity. Therefore, the
measurement data were examined for signs of artefacts originating from
impurities with higher vapour pressure. Additionally, at the inspection
of the Knudsen cells after heating to 150°C, only brown remnants were
found, which should be taken as sign for decomposition. (Unfortunately,
inspection was not made after concluding the experiment at 90°C (brown
glass cells are used).) Therefore, a second evaluation was made using
only experiments 2 - 4 for calculating linear regression. This resulted
in a correlation coefficient r of 0.9999 and vapour pressures at 20
resp. 25°C of 1.20 * 10.03 Pa and 2.62 * 10.03 Pa, respectively. The
stated vapour pressures of 1.17 * 10.02 Pa and 1.87 * 10.02 Pa represent
a worst case scenario. The result of the test can be considered valid.
The vapour pressure of Grewe-diamin was
determined following EU A.4 by the effusion method (weight loss).
Vapour pressure at five different
temperatures was examined. All five temperatures could be evaluated as
they showed reproducible weight loss. For these temperatures, 1/T was
plotted against log P. The graph 1ff vs. log P shows a straight line
with a correlation coefficient of - 0.9482.
For the test item Grewe-diamin, the
following vapour pressures at 20°C and at 25 °c were determined:
Vapour pressure at 20°C: 1.17 * 10-02 Pa
Vapour pressure at 25°C: 1.87 * 10-02 Pa
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