USG Hydrocal White Gypsum Cement

This is a good multi-purpose product for people looking to upgrade from a standard plaster product to one that has a higher degree of hardness and impact resistance.  

Hydrocal White Gypsum Cement is designed for solid and hollow casting and is ideal for giftware and lamp base applications. It is compatible with numerous color pigments Always follow handling and use directions and safety warnings on the package

Sets in 25-35 minutes

USG Ultracal 30 Gypsum Cement 

This is the ultimate gypsum cement tooling medium. When extreme accuracy and greater surface hardness are required. It provides extremely low expansion properties, gradual set and a long period of plasticity. Ideal for splash-casting molds and models for phenolic, polyester and epoxy resins. 

Ultracal 30 Gypsum Cement is water soluble – there is no need for organic solvents for cleanup.  
It is also noncombustible. When properly used, it is safe to handle and easy to work with. Always follow handling and use directions and safety warnings on the package.

Sets in 25-35 minutes

Do not mix with your hands