Process for manufacturing fine blasting media for use in wet blasting

摘要

A wet blasting media involving fine particles having a mean diameter less than 0.5 mm, and a specific gravity of at least 1.5. The particles are formed by glass beads having an irregular plastics resin mass therearound, such as a polyacetyl or polycarbonate resin. The resin has a specific gravity of 1.3 or greater. The particles readily uniformly mix with water to permit uniform blasting of articles, and at the same time the glass beads provide the particles with the desired density but do not damage the surface of the articles being blasted. A method of making the blasting particles wherein the glass beads are coated with a coupling agent and thereafter are mixed with the selected resin. The mixture is extruded into a selected shape, such as a rod, which is then pelletized. The pellets are frozen rapidly at a very low temperature, and are immediately crushed or pulverized when in this fragile frozen state so as to form the fine but irregular blasting particles.