USG Ultracal 30 is a professional low-expansion tooling gypsum designed for precision molds, case molds, patterns, prototypes and demanding SFX and resin-tooling applications. Its key advantage is dimensional accuracy and surface hardness rather than simply producing the strongest finished gypsum casting. Choose Ultracal 30 when the mold or tool is the critical component; choose Hydro-Stone when the gypsum casting itself is the finished high-strength object. Browse the full USG Plaster & Gypsum Cement collection.

Superior tooling gypsum cement features exceptional strength and hardness. Low-absorption, designed for use in case molds.

• Ultracal® 30 Gypsum Cement is a traditional tooling gypsum cement, specially formulated for close tolerance tooling. Low absorption Ultracal® 30 Gypsum Cement is recommended where extreme accuracy and surface hardness are required (i.e. duplicator molds); provides the lowest expansion of any rapid-setting gypsum cement; is ideal for splash-casting molds and models for phenolic, polyester and epoxy resins; sets 25-35 minutes after machine mixing; requires 38 parts water by weight per 100 parts plaster.

NOTE — For best storage results, keep indoors in a dry, stable environment, away from drafts. Do not stack more than two pallets high.