Smooth-On Silicone Mold Making, Liquid Rubber OOMOO 30, Easy to Use - Trial Size 2.8 lb MIX RATIO: 1A:1B BY VOLUME - Easy to use silicone rubber compound features a convenient one-to-one by volume mix ratio, no scale is necessary *Packaging may vary* SHORE A HARDNESS: 30 - This scale measures the hardness of flexible rubber molds. A 30A hardness is in the soft to medium soft range, between the flexibility of a rubber band and pencil eraser POT LIFE: 30 MINUTES, CURE TIME: 6 HOURS - This product cures at room temperature with negligible shrinkage. Best to store at room temperature, see "For Best Results" section below LOW VISCOSITY FOR EASY MIXING AND POURING - Great for making simple one- or two-piece block molds, no vacuum degassing is necessary PERFECT FOR ART AND INDUSTRIAL APPLICATIONS - Often used for molds to reproduce sculptures and other prototypes, casting plaster, resins, and wax