Pattern material

Abstract

An expendable and machinable pattern material capable of being cast in large blocks without shrinkage and machined to a casting shape useful in the lost pattern process of investment casting, the material consisting essentially of ethylene-vinyl resin, fatty acid ketone, and fatty acid.

1 . In an expendable and machinable material capable of being cast in blocks machined to a desired shape, said material containing ethylene-vinyl resin and fatty acid ketone, the improvement consisting of the addition of at least one fatty acid.  
     
     
         2 . An expendable and machinable pattern material capable of being cast in large blocks and machined to a casting shape useful in the lost pattern process of investment casting, said material consisting essentially of ethylene-vinyl resin, at least one fatty acid ketone and at least one fatty acid.  
     
     
         3 . A pattern material consisting essentially of the following ingredients in amounts by weight based on the total weight of the material: 
 5-20% ethylene-vinyl resin,    25-75% fatty acid,    25-75% fatty acid ketone,    0-20% of at least one ingredient compatible with said ethylene-vinyl resin, fatty acid and fatty acid ketone.