abrasive

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abrasive,

material used to grind, smooth, cut, or polish another substance. Natural abrasives include sandsand,
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.
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, pumicepumice
, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
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, corundumcorundum
, mineral, aluminum oxide, Al2O3. The clear varieties are used as gems and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system and in masses. It is transparent to opaque and has a vitreous to adamantine luster.
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, and ground quartzquartz,
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.
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. Carborundum (silicon carbidesilicon 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.
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) and aluminaalumina
or aluminum oxide,
Al2O3, chemical compound with m.p. about 2,000°C; and sp. gr. about 4.0. It is insoluble in water and organic liquids and very slightly soluble in strong acids and alkalies. Alumina occurs in two crystalline forms.
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 (aluminum oxide) are important synthetically produced abrasives. The hardest abrasives are natural or synthetic diamondsdiamond,
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
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, used in the form of dust or minuscule stones.

abrasive

[ə′brās·əv]
(geology)
A small, hard, sharp-cornered rock fragment, used by natural agents in abrading rock material or land surfaces. Also known as abrasive ground.
(materials)
A material used, usually as a grit sieved by a specified mesh but also as a solid shape or as a paste or slurry or air suspension, for grinding, honing, lapping, superfinishing, polishing, pressure blasting, or barrel tumbling.
A material sintered or formed into a solid mass such as a hone or a wheel disk, cone, or burr for grinding or polishing other materials.
Having qualities conducive to or derived from abrasion. Also known as abradant.

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.

abrasive

A hard substance for removing material by grinding, lapping, honing, and polishing. Common abrasives include silicon carbide, boron carbide, diamond, emery, garnet, quartz, tripoli, pumice, diatomite, metal shot, grit, and various sands; usually adhered to paper or cloth.
References in periodicals archive ?
Nor does time appear to be of much importance to one official, who scoffed rather abrasively and arrogantly at my complaint of having to wait for that "just 10 minutes.
Spy was abrasively funny because its crude, name-calling tactics made
At the moment, moreover, China is less abrasively confrontational with the United States.
Perhaps, the final iron in labeling any Mexicans in the United States "illegal", especially in States such as California, Texas, New Mexico, Nevada, Arizona, Utah, and Colorado, is that these lands were abrasively expropriated from Mexico in the first instance, following the Mexican War, provoked incidentally, by the United States, consequent upon the annexation of Texas by the latter.
Considering Mourinho snubbed Benitez in Europe last season and at the end of the Community Shield last month and has treated Liverpool as abrasively as he might a stain on the sleeve of his famous overcoat I am not holding my breath.
I heard agitated grumbling before Mickey picked up the phone and his answers were impatiently short, very abrasively answering 'warm-up' questions on his life on the road with Jan before we moved onto a new film role he has just completed.
He admitted to me more than once that he almost came to blows with one of the more abrasively opinionated members of the racing establishment.
James Bruce and Sean Ervine bowled abrasively while Dimitri Mascarenhas, less hostile, was full of intelligence.
Exploring a Christian response to various elements in the novel, Fear Not Da Vinci introduces readers to such ideals and explanations for Christians as to whether or not it is okay to read the novel, if Jesus really was married, if Mary Magdalene is pictured in "The Last Supper", if Jesus was merely a man or a God, if women are holier then men, and tactful ways to approach analyzing and discussing Dan Brown's novel with a gentle touch--as opposed to an irrational and abrasively critical argument.
Three years on from the release of their calamitous Fever To Tell debut Karen O's trio still make abrasively interesting noises.
And a sure way to keep those laughs coming is to keep the characters abrasively at odds with one another for as long as possible.
The Grocer asked dairy buyers at the top five multiples to spell out their priorities, plans and hopes for the sector, and how they will achieve healthy sales growth at retail, hand in hand with ensuring the sustainability of a troubled supply chain in an abrasively competitive world