| |
| |
|
Conventional
abrasives
|
Grains
|
Degree of
hardness
|
Structure
|
Bonds
|
|
|
10A/
12A
|
Regularaluminium
oxide
|
10, 12,
14, 16
|
very coarse
|
C, D
|
extremely soft
|
3-5
|
dense
|
V
(vitrified)
|
|
18A
|
Regular
aluminium oxide/
zirconium
aluminium oxide
|
20, 24,
30, 36
|
coarse
|
E, F
|
very soft
|
6-8
|
medium
|
V10
|
|
19A
|
Regular aluminium oxide/
zirconium
aluminium
oxide
|
46, 54,
60, 70,
80
|
medium
|
G, H,
I, J
|
soft
|
9-10
|
open
|
V20
|
|
20A
|
Half special
fused alu-
minium oxide
|
90 and fine
|
fine
|
K, L,
M
|
medium hard
|
11-20
|
very open
|
V25
|
|
30A
|
Special fused
aluminium
oxide, white
|
240 and fine
|
very fine
|
N, O,
P, Q
|
hard
|
|
|
V28
blue
|
|
31A
|
Regular/
special fused
aluminium
oxide, white
|
|
|
R, S,
T
|
very hard
|
..1, ..2
|
highly porous
|
V31
orange
|
|
40A
|
Special fused
aluminium
oxide, pink
|
|
|
|
|
..3
|
medium porous
|
V341
red
|
|
50A
|
Ruby aluminium
oxide
|
|
|
|
|
|
|
V625
blue
|
|
51A,
81A
|
Mono-crystalline
aluminium
oxide
|
|
|
|
|
|
|
V635
blue
|
|
517A,
518A
|
Mono-crystalline/
special fused
aluminium oxide
|
|
|
|
|
|
|
V655
blue
|
|
55A
|
Ruby/mono-
crystalline
aluminium oxide
|
|
|
|
|
|
|
V735
blue
|
|
60C
|
Silicon carbide,
green
|
|
|
|
|
|
|
|
|
66C,
68C
|
Silicon carbide,
dark
|
|
|
|
|
|
|
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