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Flammability testing was conducted using the method A10 Flammability (solids). Testing concluded that nickel metal is not highly flammable.
The recently completed European Union Risk Assessment for nickel (2008/2009) has acknowledged that “finely divided metal can smoulder in presence of oxygen or air” (for autoflammability endpoint) and that flammability “depends on particle size and blockage by oxidized outer layer” (for flammability endpoint). However, no classification was proposed for flammability. Non-passivated nickel metal present in a catalyst matrix may have pyrophoric and/or self-heating properties, which should be assessed on an individual basis.

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