Mold Making Essentials - How to vacuum silicone to eliminate entrapped air and remove bubbles from your finished mold or casting.
Mix Parts A & B thoroughly as per Technical Bulletin. Place mixing container into vacuum chamber. Ensure a tight seal between lid gasket and chamber. Turn on vacuum pump. Close vacuum valve to enable air flow. Vacuum pump must pull 29 inches of mercury (inHg, or 1 bar). After silicone falls, vacuum for an additional 90 seconds. Do not over vacuum! Turn off pump. Relieve pressure in chamber by opening valve. Mold Max 30 is now ready to pour.