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The classification of materials into dust classes allows for a better understanding of their properties, especially in terms of explosiveness and health hazards when dispersed in the air. Dust class 1 and 2 typically include materials that can generate combustible dust hazards.

Flour, grain, and chemicals fall into this category because they can produce fine particulate matter that, when suspended in air, poses a significant risk of explosion or health issues. These materials tend to create a dense cloud of dust that can ignite under the right conditions, leading to potentially dangerous situations in industrial or storage settings. This classification is based on the potential of these dusts to combust when exposed to an ignition source.

The other materials mentioned, such as metals, plastics, wood, organic materials, textiles, and paper products, have different properties and may not necessarily fall under these specific dust classifications. Each material's behavior regarding dust formation and combustion varies considerably, making it imperative to identify the correct risk categories for safety regulations and handling practices.