Unlike other plasters and gypsum cements, HYDRO-STONE Gypsum Cement cannot be mixed by hand and must be mixed mechanically. Mixing Properly mixing HYDRO-STONE Gypsum Cement is the most important step to producing casts with maximum strength, hardness, and other important properties. See bulletin IG503 for specific soaking instructions. Small batches require less soaking than large batches. HYDRO-STONE Gypsum Cement should be fully dispersed in the water prior to mixing. Do not drop handfuls of HYDRO-STONE Gypsum Cement directly into the water. Soaking Sift or strew HYDRO-STONE Gypsum Cement into water slowly and evenly. The water-to-HYDRO-STONE Gypsum Cement ratio is critical because it governs all physical properties of the final cast piece. Measuring Weigh both HYDRO-STONE Gypsum Cement and water at the recommended use consistency for each mix (see technical properties above). Since variations in slurry (HYDRO-STONE® Gypsum Cement and water mixture) temperature produce variations in setting time, it is important to keep both HYDRO-STONE Gypsum Cement and water in a stable temperature environment prior to use.The higher the temperature of the slurry, the shorter the set time. Preparing the Mix Use potable water at temperatures between 70 and 100 ☏ (21 and 38 ☌). Compressive Strength 4,000 psi 27.6 MN/m2ĭry Compressive Strength 10,000 psi 69.0 MN/m2 Use Consistency (parts of water by weight per 100 parts plaster) 32 32ġ Hr. Low viscosity slurry for filling multiple molds at one time. Used in high-quality art novelty and statuary castings. Works well in plaster and most flexible moulding compounds.

Hard and strong with high water absorption resistance. This USG product is used for high quality art novelty and statuary castings. Slightly higher setting and expansion than ULTRACAL 30.

Recommended for stretch-press dies where extreme surface hardness is required. When mixed properly, has a heavy, syrupy consistency ideal for pouring solid models or patterns. US Gypsum HYDRO-STONE is one of the hardest and strongest of all gypsum cements. USG Hydrostone Gypsum Cement 50 Lbs.50 lbs.

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