HYDROCAL Gypsum Cement
A high-strength gypsum cement with a low setting expansion. Adaptable to the productions of hard, strong, tough patterns and duplicator models. Has a shorter period of plasticity, stiffens more rapidly than B-11, and sets in about 15-20 minutes after mixing.

Mix equal parts of Silica Flour and Hydrocal (by weight) for a intricate, durable, and inexpensive mold. As with all plaster materials, you'll only be able to use this mold once. As with all dust producing products, please wear a dust protection respirator.