finishing abrasive definition of finishing abrasive in the Free Online Encyclopedia.

abrasive, material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand sand, rock material occurring in the form of loose, rounded or angular grains, varying in size from .06 mm to 2 mm in diameter, the particles being smaller than those of gravel and larger than those of silt or clay .
..... Click the link for more information. , pumice pumice (pŭm`ĭs), volcanic glass formed by the solidification of lava that is permeated with gas bubbles.
..... Click the link for more information. , corundum corundum (kərŭn`dəm), mineral, aluminum oxide, Al₂O₃.
..... Click the link for more information. , and ground quartz quartz, one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO₂.
..... Click the link for more information. . Carborundum (silicon carbide silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under such familiar trade names as Carborundum and Crystolon.
..... Click the link for more information. ) and alumina alumina (əl
..... Click the link for more information. (aluminum oxide) are important synthetically produced abrasives. The hardest abrasives are natural or synthetic diamonds diamond, mineral, one of two crystalline forms of the element carbon (see allotropy ), the hardest natural substance known, used as a gem and in industry.

Properties

..... Click the link for more information. , used in the form of dust or minuscule stones.

Abrasive

A material of extreme hardness that is used to shape other materials by a grinding or abrading action. Abrasive materials may be used either as loose grains, as grinding wheels, or as coatings on cloth or paper. They may be formed into ceramic cutting tools that are used for machining metal in the same way that ordinary machine tools are used. Because of their superior hardness and refractory properties, they have advantages in speed of operation, depth of cut, and smoothness of finish.

Abrasive products are used for cleaning and machining all types of metal, for grinding and polishing glass, for grinding logs to paper pulp, for cutting metals, glass, and cement, and for manufacturing many miscellaneous products such as brake linings and nonslip floor tile.

The important natural abrasives are diamond, corundum, emery, garnet, feldspar, calcined clay, lime, chalk, and silica, SiO₂, in its many forms—sandstone, sand, flint, and diatomite.

The synthetic abrasive materials are silicon carbide, aluminum oxide, titanium carbide, and boron carbide. The synthesis of diamond puts this material in the category of manufactured abrasives.

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Properties

Abrasive
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