Contribution à l’amélioration de la méthode d’essai ONU N.5 relative à la caractérisation des solides qui dégagent des gaz inflammables au contact de l’eau

Abstract : A sensitivity analysis of main parameters affecting the measurement of the gas flowrate emitted during testing substances which emit flammable gases where in contact with water, according to UN N.5 test, was performed. Ambient temperature, overall volume of glassware, nature of aqueous media, mass sample and sample-to-liquid mass ratio are not fixed in this procedure. This test is described in the Manual of Tests and Criteria of UN [A]; serving both application of international transport regulations as well as classification of substances according to the EU “CLP” Regulation. The main reason that justifies this research is that the measurement of emitted gases is highly critical in the final classification resulting from the interpretation of the test results. Moreover, that idea has been raised to adapt the UN N.5 test protocol for classifying substances that by contact with water would emit toxic gases. Results confirm that these parameters may play a significant role and alter the final classification resulting from the testing. Guiding principles have also been derived from our measurements and observations towards an improved and more robust UN test protocol in the future.
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Agnès Janes, Guy Marlair, Douglas Carson, Jacques Chaineaux. Contribution à l’amélioration de la méthode d’essai ONU N.5 relative à la caractérisation des solides qui dégagent des gaz inflammables au contact de l’eau. Rapport Scientifique INERIS, 2013, 2012-2013, pp.27-29. ⟨ineris-01869454⟩

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