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EC number: 270-877-4
CAS number: 68479-98-1
The vapour pressure of the test material was estimated at 0.000971 Pa and 0.00391 at 25°C and 35°C, respectively.
Obtaining an experimental vapor pressure value for DETDA is technically
complicated because of trace levels of impurities. The ECHA guidance
Chapter R.7A states "[t]he major cause of inaccurate vapour pressure
measurements is due to the presence of impurities in the sample which
have a higher vapour pressure than that of the major components." Though
an experimental measure is available (Featherstone and Rutland, 2010),
the investigators used the dynamic method for measuring vapour pressure.
This method is not suitable for substances with vapour pressures below 1
Pa. These data should only, however, be used for screening DETDA's vapor
pressure and identifying it as less than 1 Pa, but they should not be
relied upon as a confirmed value. Given that the greatest difficulty and
uncertainty arises with obtaining reliable measures for vapour pressure
on substances with low volatility (i.e., vapour pressure < 1 Pa), the
ECHA have recommend estimation methods under Chapter R.7A for
determining this endpoint. Of the methods listed, the ECHA found that
the SPARC software provides estimates with the lowest mean absolute
error; therefore, the vapour pressure generated using SPARC was selected.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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