US4475926A - Active filler for grinding wheels - Google ...
A resinoid bonded abrasive article in which the resinoid bond includes 5-80% by volume of an improved active filler or grinding aid. The active filler is a mixture of iron pyrites, potassium sulfate and an alkali haloferrate; the alkali haloferrate having the formula A x Fe y ++ Fe z +++ H x+2y+3z where A is an alkali metal, H is a halogen, x is a number from 1 to 10, y is a number from 0 to 1 ...