Clinker (waste)

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Clinker is a general name given to waste from industrial processes - particularly those that involve smelting metals, burning fossil fuels and using a blacksmith's forge which will usually result in a large buildup of clinker around the tuyère. Clinker often forms a loose, black deposit that can consist of coke, coal, slag, charcoal, grit, and other waste materials.

Clinker may be reused to make hard paths. It is laid and rolled, and forms a hard path with a rough surface.