Grinding wheels + Segments
     Key to the new symbols

30 A 120 / 1 J 12 V 220 S
Grit Type Size / Combination Hardness Structur Bond Type Impregnation
1 2 / 3 4 5 6 7 8
 
1 Grit Type
Vetrified Bond  
Normal alumina brown 11 A
Semi-fused alumina 55A 57A 58A
Fused alumina white 30A
Fused alumina pink 31A
Ruby corundum 32A
Single crystal 40A
Single crystall / mix 41A
Silicon carbide-dark 75C
Silicon carbide-green 70C
Zircon 23A
Cubitron 80A
Resin Bond  
Normal alumina brown 10A
Semi-fused alumina 55A
Fused alumina white/pink 30A 31A
Silicon carbide-dark 75C
Silicon carbide-green 70C
Mixture: alumina / silicon carbide 80C
2 Grit Size
(according to FEPA standard)
8 - 10 very rough
12 - 24 rough
30 - 60 medium
70 - 120 fine
150 - 240 very fine
280 - 1200 micro-fine
 
3 Combination
Mixture of various grit sizes
 
 
4 Hardness
C-G very soft
H-K soft
L-O medium
P-S hard
T-Z very hard
 

 

 

5 Structure
3 + 4 dense
5 + 6 medium
7 + 8 open
9 + 10 wide open
11 + 16 very porous
 
6 Bond
V (vitrified) ceramic
B (bakelite) resin
 
7 Bond Type
Internal designation
 
8 Impregnation
S sulphur
P paraffin wax

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» Standard shapes (profiles)


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