Description; A high quality Plaster of Paris made from pure natural gypsum, for use in medical, ceramic and moulding applications.
Chemical composition; 95% minimum CaSO4·H?O
Mineral composition; Approximately 35% Alpha Hemihydrate and 65% Beta Hemihydrate.
Particle size distribution; Typically 100% passing 200 micron
98% passing 86 micron
92% passing 63 micron
Water addition; 1,4 to 1,7 parts powder to 100 parts water.
Ideal water factor 0,64 parts water to 100 parts powder.
Test results below are at 1,57 parts powder to 100 parts water.
Start of setting; 9-12 minutes.
Final set; 29-33 minutes
Linear expansion; 0,20% (2mm / metre.)
Brinell hardness; 360kg/cm²
Claimer; The above data had better be correct, as Dave Onderstall stakes his reputation on it.