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

Structure

Open

18

17

16

Medium

15

14

Dense

13

12

11

Special Markings

SPL – Lubricity

XP – Waterproof

BW = Wet

BD = Dry