30 A	120 / 1	J	12	V	220	S
Grit Type	Size / Combination	Hardness	Structur	Bond	Type	Impregnation
1	2 / 3	4	5	6	7	8

1 Grit Type Vetrified Bond   Normal alumina brown 11 A Semi-fused alumina 55A 57A 58A Fused alumina white 30A Fused alumina pink 31A Ruby corundum 32A Single crystal 40A Single crystall / mix 41A Silicon carbide-dark 75C Silicon carbide-green 70C Zircon 23A Cubitron 80A Resin Bond   Normal alumina brown 10A Semi-fused alumina 55A Fused alumina white/pink 30A 31A Silicon carbide-dark 75C Silicon carbide-green 70C Mixture: alumina / silicon carbide 80C

2 Grit Size (according to FEPA standard) 8 - 10 very rough 12 - 24 rough 30 - 60 medium 70 - 120 fine 150 - 240 very fine 280 - 1200 micro-fine   3 Combination Mixture of various grit sizes     4 Hardness C-G very soft H-K soft L-O medium P-S hard T-Z very hard

5 Structure 3 + 4 dense 5 + 6 medium 7 + 8 open 9 + 10 wide open 11 + 16 very porous   6 Bond V (vitrified) ceramic B (bakelite) resin   7 Bond Type Internal designation   8 Impregnation S sulphur P paraffin wax

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» Standard shapes (profiles)

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