RA Chart for Traditional System

Diamond Glass Traditional Polishing System

Series 07 GTO Hybrids Maximum Ra Ranges and Suggested RPM

GRITVELCRO COLORRa#RPM
30 GritLight Blue170400-450
50 GritGrey135450-550
100 GritYellow72600-700
200 GritOrange42650-700
400 GritRed25700-800
800 GritGreen10800-900

Series 25 Phenolic Resin Maximum Ra Ranges and Suggested RPM

GRITVELCRO COLORRa#RPM
800 GritRed10800-900
1500 GritRed8800-900
3000 GritRed8800-900

ALL Ra #’s are subject to a (+/- 10%) variance

Surface Texture Grade (STG)µin (Ra)µmSurface Grade
A-120.0508Finish by Design Spec
A-240.1016Finish by Design Spec
A-380.2032High Polish
B-1160.4064Medium Polish
B-2320.8128Low Polish
B-3641.6256Honed Smooth
C-11253.175Honed
C-22506.35Ground
C-350012.7Heavy Texture

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