Mold Max® 25 is the newest member of Smooth-On’s popular Mold Max® line of high performance tin-cure silicone rubbers. Mold Max® 25 is mixed 100A:5B by weight and cures overnight to a Shore 25A. Compared to the other Mold Max® products, Mold Max® 25 has a lower viscosity Part A, making the rubber easier to mix and easier to vacuum de-gas. The working time for the Mold Max® 25 is an extra-long 60 minutes for large mold pours or for pouring several molds from a single batch of rubber.