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Auto flammability

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The relative self-ignition temperature for solids is the minimum temperature at which a certain volume of a substance will ignite under defined conditions. The self-ignition temperature of a substance can be used to assess situations in which a substance can spontaneously catch fire. (Guidance on information requirements and chemical safety assessment - Chapter R.7a: Endpoint specific guidance)
According to column 2 of Annex VII (standard information requirements for substances manufactured or imported in quantities of 1 tonne or more) of Regulation (EC) No 1907/2006 the study does not need to be conducted if preliminary results exclude self heating of the substance up to 400 °C.
Sulphuric acid, compound with graphite is an inorganic solid, consisting of natural graphite and variable amounts of intercalated sulphuric acid. The substance decomposes when being heated above 180°C. Depending on the intercalation grade the sulphuric acid starts to volatize between 160 °C and 250 °C.
Against this background, self-heating of the substance can be excluded up to 400 °C and performance of a study to determine the auto flammability is not required under Regulation (EC) No 1907/2006 (REACH).

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