Many common powders and dusts (i.e. flour and sugar) are not specifically classified as dangerous substances (there is no hazard pictogram indicating their flammability characteristics on the containers), but they have been directly involved in a large number of significant fires and explosions worldwide. Any solid materials that are not fully oxidized are potentially capable of bursting into flames or exploding, and the propensity of the hazard is primarily associated with the particle size distribution or fineness of the powder. Dusts can be
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