Some abrasives are used in solid blocks, as in the case of knife-grinding stones; but coated abrasives such as sandpaper in which abrasive granules are stuck onto a carrier make more economic use of the material.
Sandblasting exemplifies a third technique in which abrasive particles are thrown against the workpiece in a stream of compressed air or steam. Sandblasting is used for cleaning buildings and engraving glass.
Related category• TECHNOLOGY
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