Zak Jewelry Tools

Castaldo® LiquaCast® Molding Rubber

Castaldo® LiquaCast® is a 0% shrinkage room temperature vulcanizing liquid rubber that lets you make molds of delicate objects that would not survive the heat and pressure of the normal vulcanization process. Typical uses include making molds of CAD-CAM, RP and SLA resin models, wax carvings and wax injections. Also possible are objects from nature — leaves, plants, flowers, fruit, insects – anything! Castaldo® LiquaCast® is an easy-flowing two-part liquid room temperature vulcanizing compound that makes tough, strong, flexible rubber molds in 18 hours at normal temperatures. It can be cured in as little as 90 minutes at temperatures up to 66° C./ 150° F. Unlike traditional silicone liquid molding rubbers, LiquaCast® is easy to pour, easy to mix and easy to vacuum de-bubble because of its low viscosity. LiquaCast® is easy to use and requires no specialized equipment, making it ideal for those without a vulcanizer. It can even be used without a vacuum – merely coat the model with a brush dipped in LiquaCast and inspect it for bubbles before completing the pour. Any bubbles found can easily be pricked with a pin or similar tool. Models can also be dipped in LiquaCast® and then inspected for bubbles. Molds made of Castaldo® LiquaCast® liquid molding rubber will last many years if stored properly. For best results store finished molds in airtight containers such as the kind sold for food storage. Instructions. Troubleshooting. Part A MSDS. Part B MSDS.

    Shore A Hardness 40
    Mix ratio by weight 1:10
    Viscosity **

    Very low

    4,000 cps

    Vulcanizes at

    70 ̊ F/ 21 ̊C

    Cure time 18 hours
    Rapid Cure Time @150 ̊F/ 65 ̊C 90 minutes
    Specific gravity *** 1.39
    Elongation before break 897%
    Tensile strength before break

    648 psi

    4.5 n/mm²

    Tear strength Die C before break

    81 lb./in.

    14.2 n/mm

    Color Pink