Chemical: Rust from steel + aluminum dust may produce heat.
Chemical: Rust from steel + aluminum dust + strong ignition source can cause a thermite reaction that burns with a temperature of 2.400 °C and cannot become extinguished with water!
Physical: Particles of steel may be static charged and deliver an ignition source even when the dust is cold.
Physical: The hot steel sparks from grinding can deliver a perfect ignition source for the aluminum dust.
Physical: During a sandwich cut through aluminum and steel at the same time the explosive aluminum dust and the ignition source coming from hot steel sparks are produced during the same process!
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