expanded or expandable plastic material for the manufacture of foundry cores lost, and lost male compounds of said material.

摘要

PLASTIC EXPANDED OR EXPANDING FOR PRODUCING MODELS OPEN CASTING, comprising a polymer or a copolymer EXPANDED or expandable generally used for the manufacture of such models, coupled with an oxidizing agent ACCEPTING THE OPERATION OF EXPANSION unaltered substance of their OXIDIZERS properties, which is essentially unchanged CHARACTERISTICS polymer or copolymer TO THIS ASSOCIATE before, during and after expansion, not harming QUALITY METAL IS BREWING, which does not have a decomposition temperature substantially identical to THE polymer or copolymer that is associated TO ALLOW oxidation of carbon and hydrogen OF THIS during casting of molten metal. OPEN THIS MATERIAL MODEL AND EXPANDED PLASTICS METHOD FOR PRODUCING MOLDING MOLDING BY PERFORMING THESE MODELS OPEN.