Shell Moulding Casting

The metal pattern is first heated at a temperature of 200 0 C 392 0 F.Then covered with a mixture of sand and thermo set plastic. It forms a skin of sand plastic mixture of about 3.5 mm (0.125 inch) which adheres to the pattern. The shell mold is formed after the skin gets removed from the pattern. The two halved of the shell mold are secured together and the metals id poured in the shell to form the part. Once the metals solidified, the shell is broken.