Question

What is the effect marble dust mixed in gypsum plaster?

Answer 1

The most common types of plaster mainly contain either gypsum, lime, or cement, but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface.
Gypsum amount is controlled to 2 to 4 % of cement to control flash set. Extra amounts may be harmful.