ABRASIVE SIZE OF THE ABRASIVE HARDNESS OF THE BOND STRUCCTRE BOND CODE SYMBOL Aluminum Oxide (AL 2°3) "A"  8    30    70    220 B - Resinoid Letters or Numbers to Designate a Variation of bond or characteristics of the wheel White Aluminum Oxide "A A"  10   36   80   240 V - Vitrifield Pink Aluminum Oxide "R A"  12   46   90   280 R - Rubber Mixture of Brown & White Al. Oxide "D A"  14   54   100   320   Black Silicon Carbide (Sic) "C"  16   60   120   Green Silicon Carbide "G C"  20          150   Aluminum Zirconium "Z" 24           180   ABRASIVE SIZE OF THE ABRASIVE HARDNESS OF THE BOND STRUCCTRE BOND CODE SYMBOL Aluminum Oxide (AL 2°3) "A"  8    30    70    220     B - Resinoid Letters or Numbers to Designate a Variation of bond or characteristics of the wheel White Aluminum Oxide "A A"  10   36   80   240   Dense V - Vitrifield Pink Aluminum Oxide "R A"  12   46   90   280  L N  R  T  Z   R - Rubber Mixture of Brown & White Al. Oxide "D A"  14   54   100   320       Black Silicon Carbide (Sic) "C"  16   60   120       Green Silicon Carbide "G C"  20          150   Open / Porous   Aluminum Zirconium "Z" 24           180                 Vision "RIGHT QUALITY" ! "RIGHT PRICE" !
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