Super-strength gypsum cement recommend where extreme accuracy and greater surface hardness are required, as in duplicator models. Ultracal 30 has the lowest expansion of any rapid-setting gypsum cement available. Ultracal 30 was designed to give the patternmaking industry the ultimate in a gypsum cement tooling medium.
Ultracal 30: Mix Ratio (Parts Water by Weight per 100 Parts of Plaster): 38 Set Time: 25 - 35 minutes % Setting Expansion Max: 0.08 Approx. Density (lb/ft3) Wet: 115.00 Approx. Density (lb/ft3) Dry: 99.00 Compressive Strength (psi) Dry: 6,000