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 |