A white powder that react with water to crystallize rock hard. Generally known as plaster powder or calcined calcium sulphate/Gypsum. Its setting time vary from fast setting 5 minutes to 30 minutes normal grade. Set hardness is generally soft and easy to shape or carve. The harder version hydrostone or green stone is colored light blue or green. Hard plaster is suited as mother mold to cast molds with normal grade soft plaster of paris as slip casting mold with T-22 slip clay.
General use in sculptures, taxidermy, wall fillers, additive to acrylics paints to formulate chalk paint. Hand prints cast with HB2 clay mold. Mix with paper mache or coat over papier mache sculptures for better strength.
As a base coat for gold gilding and wood filling. Mix plaster with water into a slurry. Paint let set and fine sand. Seal with matt sealer before gilding or painting.
Formulate with pumice, perlite powder or mullite fillers one can cast molds for glass slumping, thermoforming, fishing lead casting. centrifugal casting mold for pewter or as a insulating plaster for pizza oven and stove.
Mix with colloidal silica or fumed silica increases porosities for lighter weight dioramas, taxidermy and better mold absorption of moisture and fragrances.
