Abstract: New molded products and methods of manufacturing the same are described. More particularly, the molded products comprise thermoset resins and intimately dispersed inorganic solid particles, and the method comprises in its broadest sense, preheating a thermosetting organic resin and a catalyst for the resin to a temperature sufficient to reduce the viscosity of the resin and catalyst to that of a very fluid liquid, and also preheating discrete inorganic solid particulates prior to mixing of the particulates with the fluid resin-catalyst mixture. Such regulated preheating of the resin, catalyst and particulates results in improved wetting of the particulates with the resin-catalyst mixture and in the release of air bubbles during the mixing operation thereby resulting in molded products having improved properties, particularly products wherein the resin is in relatively unstressed and unflawed condition.

Abstract: Extremely fine abrasive particles are incorporated in an elastomeric resin body or coating to produce abrasive articles exhibiting cushioned or resilient yielding qualities having a dual response to in-service conditions. These performance characteristics are accomplished by a structure whose working surface and underlying supporting means produce two distinct and complementary abrading actions, one hard enough to sharpen a hardened cutting tool and to smooth the adjacent surface, and a second of being virtually simultaneously micro-deformable, via the mechanisms of cold flow, at or near maximum or optimum sharpening pressure. Such abrasive articles allow limited local displacement of a volume of the abrasive surface layer in a continuous wave to lift the surface at the tool edge to a height slightly beyond the plane of the edge being sharpened to "wipe" and so refine the extreme edge of the cutting tool and to remove the "wire-edge" as only athree-dimensional form of contact will accomplish.

Abstract: Differentiation between grinding wheels which are dimensionally stable in use and which remove stock to specification tolerances and polishing wheels which are flexible and which primarily do not remove stock but which "fill the valleys with the hills" call for different development. This invention is directed to a polishing tool (wheel) comprising selected abrasive, filler and plastic elastomeric bond to produce a non-rigid solid tool (wheel) of minimum voids content, the cured elastomeric bond alone characterized by a Shore hardness of 45-55 but the completed tool face hardness is not in excess of about 96 "Shore A" hardness. The so limited polishing wheel is characterized by non-chattering, non-loading, aggressive and is yet non-smearing. It is arrived at by accurate volume control ratios of the components essentially present in the product.