GYPSUM BASED INVESTMENT POWDER CASTING

Brand Owner Address Description
ADVANTAGE RANSOM & RANDOLPH 3535 BRIARFIELD BOULEVARD MAUMEE OH 43537 gypsum-based investment powder for casting of precious and semi-precious alloys used in the manufacture of jewelry;
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. The present invention consists of an investment casting process that makes use of a frangible low-strength investment material mold and a mold removal solution to facilitate the removal the investment material mold from the casting. The mold removal solution is a liquid that permeates the mold material and effervesces while inside the mold material, causing fracturing of the frangible investment material mold, and carrying away the resulting mold particles. The investment material compositions have the property of sufficiently decreasing in strength after cooling to facilitate the removal of the mold material by the removal solution. Two particular investment material compositions that possesses these properties are describe which contains powdered silica quartz, beta-hemi-hydrate calcium sulfate (gypsum), a hardening agent of potassium sulfate, and water. A mold removal solution composition is described that is composed of hydrogen peroxide solution in water.