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ABRASIVE TYPE
Aluminum Oxide
2A Zirconia
4A Regular (Brown)
5A Semi-Friable
6A Friable (White)
8A Cubitron
9A Tough Ceramic
Silicon Carbide
3C Semi - Friable
GC Friable (Green)
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GRAIN SIZE
Coarse
12
14
16
20
24
Medium
30
36
46
60
Fine
80
100
120
150
180
220
Very Fine
240 & Above
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GRADE
Soft
C
D
E
F
G
H
Medium
I
J
K
L
M
N
O
P
Hard
Q
R
S
T
U
V
W
X
Y
Z
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BOND TYPE
B = Resinoid
Structure
Open
18
17
16
Medium
15
14
Dense
13
12
11
Special Markings
SPL - Lubricity
XP - Waterproof
BW = Wet
BD = Dry
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