One of the first casting design decisions is the choice of a molding method, which will determine the surface finish and the dimensional tolerances of the finished casting. 

Spokane Industries casting engineers selected --

CHEMICALLY BONDED SAND MOLDING
In this molding method, a  mixture of fine sand and a urethane binder is packed around a wood or metal pattern in mold flasks. At room temperature, the sand- binder mixture becomes rigid. Pattern halves are removed and the mold is assembled with or without cores.

Chemically bonded sand was chosen as the most effective casting approach, based on the tolerance specifications, surface finish requirements, the moderate size and simple shape of the casting, and the limited production run.

The following table lists the typical properties and characteristics of chemically bonded sand.