USG Ultracal 30 Gypsum Cement can be mechanically mixed through both batch and continuous processes. Mechanically mixed slurries develop uniform casts with optimal strengths. Mixing USG Ultracal 30 Gypsum Cement slurry is one of the most important steps in producing USG Ultracal 30 Gypsum Cement casts with optimal strength, absorption, hardness and other important properties. See USG IG503 Plaster Mixing Procedures for specific soaking instructions. Small batches require less soaking time than large batches. USG Ultracal 30 Gypsum Cement should be fully dispersed in the water prior to mixing. Do not drop large amounts of USG Ultracal 30 Gypsum Cement directly into the water as proper soaking of the USG Ultracal 30 Gypsum Cement may not occur. Sift or strew USG Ultracal 30 Gypsum Cement into the water slowly and evenly. The water-to-USG Ultracal 30 Gypsum Cement ratio is critical because it governs the strength and the density of the final cast. Weigh both the USG Ultracal 30 Gypsum Cement and the water prior to use for each mix. Conversely, the lower the temperature of the slurry, the longer the set time. The higher the temperature of the slurry, the shorter the set time. Because variations in slurry (USG Ultracal 30 Gypsum Cement and water mixture) temperature produce variations in set time, it is important to keep both the USG Ultracal 30 Gypsum Cement and water in a stable temperature environment prior to use. Use potable water at temperatures between 70 ☏ (21 ☌) and 100 ☏ (38 ☌). Always follow handling and use directions and safety warnings on the package. When properly used, USG Ultracal 30 Gypsum Cement is easy to work with. USG Ultracal 30 Gypsum Cement is noncombustible. Ideal for splash-casting molds and models for phenolic, polyester and epoxy resins, USG Ultracal 30 Gypsum Cement is water soluble – there is no need for organic solvents for cleanup. ![]() ![]() It provides extremely low expansion properties, gradual set and a long period of plasticity. When extreme accuracy and greater surface hardness are required (as in duplicator models), use USG Ultracal 30 Gypsum Cement. ![]() USG Ultracal® Brand 30 Gypsum Cement is designed for the patternmaking industry as the ultimate gypsum cement tooling medium. AVAILABLE IN 5, 25, AND 50LB OPTIONS IN THE DROPDOWN
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