Expendable Molds (5)

Question 1

Green Mold

Answer 1

“Sandcastle Sand”

• Mixture of silica, sand, clay and water
• Moldable sand

Question 2

Dry Sand Casting

Answer 2

Originally made from Green Sand, modified for dry properties and cooked in an oven.
- More susceptible to Hot-Tears than the Green Sand Mold

Question 3

Shell Mold Casting

Answer 3

Made by covering a heated machined metal pattern with sand that is mixed with with small particles of Thermosetting Plastic. The Mold is baked and hardened to accommodate the molten pour.

Question 4

Investment Casting

Answer 4

(Precision Casting/Lost Wax process) The Pattern is made of wax and is dipped and encased in a refractory slurry of Ceramic particles. The Mold is heated, melting the wax and leaving the Casting.

Question 5

Plaster Mold

Answer 5

Made of plaster of Paris with additives such as; talc, silica flour, sand

• High dimensional accuracy
• Only cast Non-Ferrous materials