CASTALDO® White Label, the less expensive and firmer of our two grades, has a high concentration of pure natural gum rubber, which makes it resilient and pliable, qualities that the experienced mold-maker values in his efforts to produce high-quality molds in the shortest reasonable time.
- Vulcanize at 310°F for 15 minutes per 1/4" of mold frame thickness.
- Rubber is 1/8" thick
