Use this silicone mold making rubber for making perfect reproductions of original models. It captures intricate detail and is easy to use. Oomoo 30 is easy to use silicone rubber compounds that feature convenient one-to-one by volume mix ratios (no scale necessary). Very low viscosity for easy mixing and pouring and vacuum degassing is not necessary. Cures at room temperature with negligible shrinkage. Oomoo 30 has a 30-minute pot life, with a six-hour cure time. For the novice mold maker - oomoo 30 does not have great tear strength. They are good for making simple one- or two-piece block molds. Oomoo 30 is suitable for a variety of art-related and industrial applications including making molds for sculpture and prototype reproduction, casting plaster, resins and wax. Net weight 16 oz. (454 Grams). Technical information mixing ratio: one to one by volume (100a:130b by weight) pot life: 30 min. Demold: 6 hrs. Color: lavender properties (part aand b mixed) viscosity: 4,250 cps g/cc: 1.34 Cu. In./Lb.: 20.6 Tensile strength: 240 psi elongation at break: 250% die c tear strength: 40 pli compression set: 37% shrinkage:.0025 In./In.