Emery - As Abrasive Grains
Natural Emery is consists of the mineral aluminum oxide (corundum), mixed with other species such as magnetite and also titania. Industrial emery may contain a variety of other minerals and synthetic compounds such as magnesia, mullite, and silica. However natural emery is mostly made of Corundum. Translucent brown Corundum and Emery are the most common forms of Corundum. These are fairly common and when ground up, they are the most favorable abrasives.
The industrial term "emery" describing corundum abrasive is derived from the variety Emery which is mined for abrasive use. It is brownish-black or dark gray in color. Natural emery is the hardest mineral after diamond, making it the second hardest mineral with a mohr�s hardness value of 9. Crushed or naturally eroded emery (known as black sand) is used as an abrasive � for example, as used in mechanical engineering as Emery Cloth.
Man-made emery is a regular aluminum oxide containing a small amount of ferric oxide. This addition gives high durability.
Emery is recommended for hand polishing of ferrous and nonferrous materials. Emery is widely used in manufacturing of coated abrasives like emery cloth & emery paper. The typical self sharpening action of the emery grains with needle shaped grains and uniform grading make emery grains the first choice for use in this application.
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