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Specification designation and overview of abrasives<br />
Specification as short characterisation of grinding tool<br />
Example<br />
89a 60 M 5 V 217<br />
abrasive description<br />
Grit sizes<br />
Description<br />
10A<br />
50A<br />
Regular aluminium oxide<br />
Mixture of 89A and 10A<br />
Grit size indication<br />
in mesh<br />
(sieve size per inch)<br />
52A Semi-friable aluminium oxide<br />
14 36 course<br />
Mixture of 88A and special<br />
46 60 Medium<br />
80A<br />
aluminium oxide<br />
80 220 Fine<br />
800 1200 Very fine<br />
87A<br />
88A<br />
89A<br />
Mixture of 89A and 88A<br />
Pink fused aluminium oxide<br />
White fused aluminium oxide<br />
hardness Structure Bond Bond designation<br />
Hardness ascends<br />
alphabetically<br />
e.g.<br />
G = soft<br />
R = hard<br />
The higher the number,<br />
the more open the<br />
wheel is.<br />
V =<br />
Vitrified-bonded<br />
B =<br />
Resin-bonded<br />
e =<br />
Elastic-bonded<br />
G =<br />
Galvanic-bonded<br />
Internal code,<br />
which defines bond<br />
type.<br />
91A<br />
92A<br />
93A<br />
97A<br />
454A<br />
455A<br />
C<br />
1C<br />
50C<br />
Red fused aluminium oxide<br />
Mixture of 89A and special<br />
aluminium oxide<br />
Mixture of 89A and 91A<br />
Special aluminium oxide<br />
Mixture of sintered aluminium oxide<br />
and 89A<br />
Mixture of sintered aluminium oxide<br />
and 89A<br />
Green silicon carbide<br />
Black silicon carbide<br />
Silicon carbide mixture<br />
Green/black<br />
Example of a vitrified-bonded TYROLIT grinding wheel with conventional abrasive grain 89A 60 M5 V217.<br />
B 126 C50 B 54<br />
abrasive description Grit size description Concentration Bond Bond designation<br />
B<br />
D<br />
CBN<br />
Diamond<br />
Grit size indication in µm<br />
(average grit diameter<br />
according to FEPA)<br />
The grain concentration<br />
shows the grain volume in<br />
carat, according to the unit<br />
of volume of the grinding<br />
layer.<br />
B = Resin-bonded<br />
M = Metal-bonded<br />
Internal code, which defines<br />
bond type.<br />
Example of a resin-bonded TYROLIT grinding wheel with CBN abrasive grain B 126 C50 B54.<br />
Alu<br />
Non and low-alloyed<br />
steels<br />
High-alloyed steels<br />
Unhardened Hardened Unhardened Hardened<br />
HSS<br />
INOX<br />
Cemented<br />
carbide<br />
Industrial<br />
ceramics<br />
Cast iron<br />
Dry grinding Wet grinding<br />
89a<br />
93a<br />
Extremely suitable<br />
Limited suitability<br />
148
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