scope:

This document specifies analysis and evaluation procedures for determining self-ignition temperatures (T_SI) of combustible dusts or granular materials as a function of volume by hot storage experiments in ovens of constant temperature. The specified test method is applicable to any solid material for which the thermal explosion theory according to Annex A.2 holds (i.e. not limited to only oxidatively unstable materials).

The specified test is applicable to any dust or granular material that reacts primarily with oxygen from the air. For safety reasons, this test shall not be used with materials mixed with solid/liquid oxidant (e.g. gunpowder, thermites, wood impregnated with liquid oxygen) or materials that could undergo violent non-oxidative reactions (e.g. peroxides, explosives). On a case by case basis, some types of materials undergoing nonoxidative reactions (e.g. non-violent exothermic decomposition reactions) may be however tested provided that additional safety precautions are taken. Where any doubt exists about the existence of hazard due to the properties of the test material (e.g. toxic or explosive), expert advice should be sought.

This document is not applicable to the ignition of dust layers or bulk solids under aerated conditions (e.g. as in fluid bed dryer).