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- Emery Abrasive Grain & Powder Synonyms:
iron spinel, emery grit, aluminum oxide, aluminum trioxide, black sand, hercynite powder grit grain, polishing lapping emery, iron spinel, hercynite, impure corundum, natural aluminum oxide, emery mill stones, emery flour, jeweler's emery, crocus cloth, CAS# 1302-74-5
- Emery Abrasive Grain & Powder Designations:
Chemical Formula: Al2O3 + an iron bearing mineral + trace impurities such as mullite, titania, silica, and magnesia.
- Emery Abrasive Grain & Powder Description:
a) A natural occurring odorless mineral having its broadest use as an abrasive in polishing applications. An intimate mix of corundum and magnetite. The higher amounts of impurities and weaker internal structure than naturally occurring minerals has restricted its growth in new applications.
b) It is brownish-black or dark gray in color. It is the hardest mineral after diamond, making it the second hardest mineral with a mohs hardness value of ~9.
- Emery Abrasive Grain & Powder Nominal Chemical Properties:
Al2O3= 58.0%, Fe2O3= 24.0%, SiO2= 4.0%, TiO2= 3.0%, CaO= 2.0%
- Emery Abrasive Grain & Powder Physical Properties Available:
Aggregate Sizes Available:
3/8" x F, 1/4" x F, 8/16 grit, 8/35 grit, 12/30 grit, 14/36 grit, 24/60 grit, 30/40 grit, 30/80 grit, and 100/200 grit
72, 80, 92, 100, 120, 150, 152, 180, 200, 220, and 240
- Emery Abrasive Grain & Powder Typical Physical Constants:
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Molecular Weight (g/mol.)
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Apparent Density (g/cm3)
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3.7 to 4.3
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Thermal conductivity (cal/s-cm-°C)
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Melting Point (°C)
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Boiling Point (°C)
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RTECS
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GN0231000
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L.O.I.
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~0.76
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Mohs Hardness
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8-9
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Color
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black or dark gray
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Specific Gravity
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3.5- 3.8
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Particle Shape
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blocky with sharp edges
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Crystallography
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polycrystalline
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- Emery Abrasive Grain & Powder Typical Applications:
Summary: Abrasive polishing applications, concrete non-skid surfaces in conjunction with concrete or epoxy resins, barrel finishing, pressure blasting, coated abrasives, tumbling and deburring media, lens grinding and lapidary work.ated Abrasives: 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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b) Flour Mill Stones: Emery grains are mixed with the magnesium oxide and magnesium chloride slurry and allowed to set in a mould to form a solid flour mill stone. Due to superior hardness, emery grains help in better quality and durable mill stones.
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c) Sandblasting/Abrasive Blasting: Emery grain is the most suitable material for sandblasting purposes. Emery is shot across a surface at high speeds by pressurized machines. The effect is similar to that of using sandpaper, but provides a more even finish with no problems at corners or crannies. Also unlike other abrasive materials, emery grains have more than one sharp edges on each particle. With this characteristic, emery grains can be used more than once (usually 2-3 times) in a sandblasting operation. Please check the emery picture above. Besides emery is non-hazardous for human health, providing improved worker safety and confort.
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d) Anti-Skid and Non-wear Flooring: Surfaces in highways, shipyards and airports are under heavy traffic. Emery is used on these surface to make them more resistant. Either with oxychloride formulation or with plain Portland cement, emery grains can be used as hard aggregates for anti skid and non wear flooring. This type of flooring is very useful in areas like warehouses with heavy forklift traffic, workshops where oil is spilled and heavy objects fall now and then, hospital ramps, reception areas with heavy foot traffic, ship decks, and treads of staircases and so on. Superior abrasive action of the emery grains imparts better grip and resist the wear caused by heavy traffic. At toll booths on highways, such surface will provide good braking for the vehicles and add as a safety feature.
e) Traction Enhancement: Emery is commonly used in asphalt to enhance traction.
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f) Rice Polishing and Dehusking: Emery grains along with magnesium oxide and magnesium chloride are applied to the rice sheller cone , in rice mills for polishing rice with minimum broken grains and faster output. The special rice polishing grade emery grains form a superior oxychloride bond and as a result the stone lasts longer.
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g) Deburring and Descaling: Metal parts sheared and cut , left with unfinished edges can be deburred with emery in minutes , by putting the parts in barrels and tumbling them along with coarse sized emery grains. Similarly metal parts with rusty surface and salt deposits can be easily cleaned.
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h) Stainless Steel Polishing: Emery grains applied on a cloth buff is widely and popularly used for polishing of metal articles like automobile accessories (car bumpers, door handles) , dinnerware and table ware ( bowls, plates, knives, spoons, forks etc.) stainless steel balls for ball bearings and innumerable other stainless steel articles. The smaller individual crystal size, higher corundum content, and perfect sizing makes emery the first and popular choice for Stainless steel polishing. This product can also be used in form of a emery compound or paste.
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- Emery Abrasive Grain & Powder Typical Packaging:
50 lbs. bags, poly-lined fiber drums and bulk bags
- Emery Abrasive Grain & Powder Health Status:
Please visit the CDC / NIOSH Pocket Guide for Emery at this External Link
- Emery Abrasive Grain & Powder CAS Numbers:
a) CAS# 1302-62-1 (almandite garnet)
b) CAS# 1302-74-5 (corundum)
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