Del Milano Plasteline Clay (non-sulfurated) - TAN was formulated to benefit silicone and urethane rubber mold makers. Sulfur although non-hazardous, will often inhibit the ability of a silicone and polyurethane rubber to cure. By eliminating sulfur, the use of a protective sealer over the clay is not normally required. Del Milano may require some heat to soften it to your preferred working consistency.
At room temperature it will cut and carve nicely. This clay is extremely resistant to cracking, has excellent adhesive qualities and has the ability to hold exceptional detail. Available in soft, medium, and hard. It can be melted and poured at approximately 185 F. Specifications: Dimensions (2 Lb block) : 2-3/4 in x 2-3/4 in x 5 in Specific Volume, cu. in/lb; 22.5 Can be melted and poured at approximately 185 F.
Read more about how to use non drying clays here.