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Abrasive grain (artificial abrasive)

Abrasive grains for grinding wheels are roughly classified as shown in the table.

Type Abrasive grain sign by JIS Grinding wheel sign by JIS Sign by Mitsui

Features

Color Chemical composition Applications
Brown alumina A A A Brown Al2O3 95%

TiO2 2-3%

General steel free grinding, raw steel precision grinding
Single crystal alumina HA HA H Grayish white Al2O3 99%

TiO2 0.1-.03%

Alloy steel, tool steel, quenched steel precision grinding
Pale pink alumina PA PA PA Pink Al2O3 99%

Cr2O3 contained

Alloy steel, tool steel, quenched steel precision grinding

 

White alumina WA WA WA White Al2O3 99% or more Alloy steel, tool steel, quenched steel precision grinding, light grinding
A mix   A/WA

A/HA

WA/HA

19A

19H

38H

    Intermediate application of A and WA, special precision grinding
Black silicon carbide C C C Black SiC 99% or more Nonferrous metals grinding, nonmetalic materials grinding, cast iron precision grinding
Green cilicon carbide GC GC GC Green SiC 99% or more Cemented carbide grinding
C mix   C/GC BGC      
A & C mix   A/C 37A

39H

    For resinoid grinding wheel