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The base of softer, less resistive elements is worn away by abrasives
Abrasives Market

Abrasives are hard materials that are used to wear/shape the work piece's soft surfaces. The friction between the abrasive materials when rubbed against the work piece is used to achieve a smooth final product. Abrasives are hard and brittle materials that can be found naturally or synthesised. Naturally occurring abrasives include calcium carbonate (calcite), diamond dust, and emery. Abrasives are useful for polishing, grinding, sharpening, drilling, sanding, buffing, and cutting.

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