Molding plaster is a kind of polymer plaster that is widely used in the molding,casting and sculpture industry. Another application of molding plaster in dentistry is the manufacture of dental molds. This product, also known as dental plaster, should have the following characteristics:

1- The paste from the combination of water and gypsum powder should be sufficiently fluid and formable to fill the mouth and teeth.
2- The time of loading of this dough should be such that it is possible to make molding at a certain time
3- The amount of its volume changes is as low as possible to maintain the true size
4- It has enough hardness and has the strength to bear high pressure and friction
5- Its porosity is low

Properties of plaster moulds
1- Possibility to control the bubbles that created in the mortar from the plaster and eliminate them
2- Create a good mortar
Reduce water to plaster
Increase plaster surface hardness
Lack of plaster volume increase
Low gypsum water absorption after final drying
Low setting time