Abstract: A method of stabilizing a plurality of soiled towels and determining the quantity of the towels comprises removing any foreign objects from the soiled towels, saturating the soiled towels with a liquid that prevents the evaporation of any volatile compounds, compressing the saturated towels to remove unabsorbed liquid, then weighing the compressed towels and calculating the approximate number of towels present by dividing the weight of the soiled compressed towels by the known weight of a soiled compressed towel. An apparatus for performing the method also is disclosed.

Abstract: A method for separating water soluble, polymerizable resin from rinse water containing such resin which comprises adjusting the specific gravity of the rinse water so that the resin floats on the surface of the rinse water. The resin is then removed and purified for reuse.

Abstract: Thermally curable liquid sealants for impregnating the pores of cast metal articles and powdered metal articles consist of a combination of polymerizable components including at least about 15% by weight of a water emulsifiable unsaturated polyester and no more than 20% of a monofunctional methacrylate or acrylate monomer. The sealants when cured, have low weight loss when tested for heat resistance, acceptable weight gain or loss when tested for chemical resistance upon submersion in water, brake fluid, antifreeze and methanol alcohol.

Abstract: Thermally curable liquid sealants for impregnating the pores of cast metal articles and powdered metal articles including a combination of five polymerizable components within stated percentage ranges essential to providing sealants that, when cured, have low weight loss when tested for heat resistance, low weight gain when tested for chemical resistance upon submersion in water, brake fluid and antifreeze, and superior sealability characteristics.

Abstract: Thermally curable liquid sealants for impregnating the pores of cast metal articles and powdered metal articles including a combination of five polymerizable components within stated percentage ranges essential to providing sealants that, when cured, have low weight loss when tested for heat resistance, low weight gain when tested for chemical resistance upon submersion in water, brake fluid and antifreeze, and superior sealability characteristics.

Abstract: An apparatus (2) for the impregnation of metal castings including an impregnation chamber (11) having an open end; a movable assembly (2) comprising a cover (20) for closing the open end of the impregnation chamber, a casting carrier (21), carrier transport means (22) for raising and lowering the casting carrier relative to the cover, and carrier rotating means (23); and transport means (24) for raising and lowering the movable assembly relative to the open end of the impregnation chamber. The impregnation chamber is partially filled with liquid sealant (30). The apparatus is operated to position the carrier in the impregnation chamber above the liquid sealant therein and develop a vacuum in the chamber, submerge the carrier (and castings therein) in the sealant, and then raise the carrier above the sealant level and rotate carrier to spin-off excess liquid sealant; the movable assembly is thereafter raised to unload impregnated castings.