HYDROCAL® WHITE GYPSUM CEMENT

USG Hydrocal White Gypsum Cement is designed for solid and hollow casting and is ideal for giftware and lamp base applications.

Mix Preparation

• Use potable water at temperatures between 70 °F and 100 °F. Because variations in slurry (USG Hydrocal White Gypsum Cement and water mixture) temperature produce variations in set time, it is important to keep both the USG Hydrocal White Gypsum Cement and water in a stable temperature environment prior to use. The higher the temperature of the slurry, the shorter the set time. Conversely, the lower the temperature of the slurry, the longer the set time.\
• Weigh both the USG Hydrocal White Gypsum Cement and the water prior to use for each mix. The water-to-USG Hydrocal White Gypsum Cement ratio is critical because it governs the strength and the density of the final cast.

Soaking

Sift or strew USG Hydrocal White Gypsum Cement into the water slowly and evenly. Do not drop large amounts of USG Hydrocal White Gypsum Cement directly into the water as proper soaking of the USG Hydrocal White Gypsum Cement may not occur. USG Hydrocal White Gypsum Cement should be fully dispersed in the water prior to mixing. Small batches require less soaking time than large batches.

Mixing

• Mixing USG Hydrocal White Gypsum Cement slurry is one of the most important steps in producing USG Hydrocal White Gypsum Cement casts with maximum strength, absorption, hardness and other important properties.
• Mechanically mixed slurries develop uniform casts with optimal strengths. USG Hydrocal White Gypsum Cement can be mechanically mixed through both batch and continuous processes. Proper blade and bucket dimensions are important for obtaining the best batch mix
• Longer mixing times result in higher mold strength and shorter set times.