USG Ultracal® 30 Gypsum Cement is a traditional tooling gypsum cement, specially formulated for close tolerance tooling. Low absorption USG Ultracal® 30 Gypsum Cement. Provides the lowest expansion of any rapid-setting gypsum cement. Is ideal for splash-casting molds and models for resins. Sets 25-35 minutes after machine mixing, requires 38 parts water by weight per 100 parts plaster.
Price: $34.65 ($0.69 /pound)