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Chesterfield
S41 9QJ
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The Jowitt & Rodgers' Marking System
Abrasive Type Grit size Grade Fillers Bond type Other
GW 36 K 5 B Z

W - contains aluminium oxide.
G - contains aluminium oxide.
F - contains aluminium oxide.
X - contains silicon carbide.

 Coarse:
14
16
20
22
24


Medium:
30
36
40
46
50
54
60


Fine:
70
80
100
120
150
180

 Soft
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
Hard 		  B = Resinoid Manufacturers' special markings

 
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