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sandblast,stream of sand or other abrasive particles driven by a jet of compressed aircompressed air,
air whose volume has been decreased by the application of pressure. Air is compressed by various devices, including the simple hand pump and the reciprocating, rotary, centrifugal, and axial-flow compressors.
..... Click the link for more information. or water or by centrifugal force against a surface to clean or abrade it. When centrifugal force is used, the abrasives are whirled in a rapidly rotating device before being directed against the surface. Powdered quartz, emery, chilled iron globules, and other hard granular substances are used as the abrasive material. The sandblast is used for cleaning castings in foundries; for preparing metal surfaces for painting, enameling, and galvanizing; and for cleaning the stonework of buildings. Frosted designs are worked on glass by placing a stencil or suitable pattern over the surface so that the blast affects only the uncovered parts.
To use sand, propelled by an air blast, on metal, masonry, concrete, etc., to remove dirt, rust, or paint, or to decorate the surface with a rough texture.
a jet of sand or grit blown from a nozzle under air, water, or steam pressure