The instant invention relates generally to abrasive stones for use in processing workpiece surfaces. The abrasive stones generally are produced by combining an epoxy novalac resin mixture with microballoons and a catalyst. The mixture is put into a mold, cold pressed, and then cured, creating abrasive stones having a uniform surface and bulk structure with a uniform hardness, suitable for workpiece processing.
Urethane molded products for polishing pad comprise two types of cells having different sizes in urethane molded products formed by mixing and curing an isocyanate-terminated urethane prepolymer and an active hydrogen-containing compound. The molded products may be made by a procedure comprising mixing expanded microballoons or non-expanded, thermally expandable microspheres and water with the isocyanate-terminated urethane prepolymer and active hydrogen-containing compound and curing the mixture.
