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)

GRAIN SIZE

Coarse

12

14

16

20

24

Medium

30

36

46

60

Fine

80

100

120

150

180

220

Very Fine

240 & Above

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

BOND TYPE

B = Resinoid

O = Oxychloride

E = Epoxy

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Perforations

CS4 = 1/4″ Perfs

CS = 3/8″ Perfs

CL = 1/2″ Perfs

Special Markings

SPL – Lubricity

XP – Waterproof

RCP – Plug Inserts

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BW = Wet

BD = Dry