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Wool, felt or plain rubber wheels test delicate materials or abrasiveness of materials such as dental powders.

Wheels featuring abrasive particles in a resilient matrix of rubber or a hard matrix of vitrified clay are suitable for stiffer materials.
 

• Calibrase^® : resilient abrasive wheel - rubber and aluminium oxide
• Calibrade^®: a non-resilient abrasive wheel - vitrified clay and silicon carbide
• Plain Rubber: contains no abrasive particles unless used with sandpaper strips
• Tungsten Carbide: severe cutting and tearing action with helical teeth for use on resilient  materials such as rubber, leather and floor coverings