Gypsum dolls are model plasters, which are made of calcium sulfate hemihydrate with an α-type structure and appropriate pigments and other additives. Gypsum molds are traditional molds that have been used in industrial production for a long time. Forming molds, the basic material in casting production based on slip casting, have become an important factor restricting casting molds, regularity, labor productivity and production costs.

Gypsum molds are traditional molds that have been used in industrial production for a long time. Forming molds, the basic material in casting production based on grouting molding, have become constraints on casting molds, regularity, labor productivity and production costs. important factors.

Extended information:

Performance requirements for gypsum model materials:

Have good fluidity and plasticity; have appropriate solidification time, usually 30~60min Appropriate, including the time from infusion to removal of the model; high accuracy, small volume changes, and stable dimensions.

It has high compression strength and high surface hardness; it does not undergo chemical changes with the matching impression material, has a smooth surface and is easy to demould; it is easy to operate and low in price, which is conducive to popularization and use.

Baidu Encyclopedia-Model Plaster