PROCESSING MATERIAL AND TOOL FOR PROCESSING

PROBLEM TO BE SOLVED: To eliminate necessity of dressing even in use for a long period of time by including pores in a processing material arranging inorganic fiber as a resin matrix and making its porosity in a specific numerical range. SOLUTION: When a processing material arranging inorganic fiber as a processing element becomes minute in porosity, a blinding phenomenon occurs, and when it becomes too porous, its strength drops and it does not function as a processing material. Consequently, it is necessary to make porosity 3-30%, and desirable to make it within a range of 3-10%. With the processing material of porosity within this range, pores work to help falling of inorganic fiber and resin even in grinding and polishing to cause blinding with the processing material pores of which are minute. Consequently, as the processing material itself continues to expose a new fiber surface of the inorganic fiber which is the processing element while sliding and the processing material which does not cause blinding is formed.