NovaSil #737 is recommended for molds containing deep undercuts due to its flexibility and strength for easy part removal. Its low viscosity ensures easy mixing and pouring in addition to reducing air entrapment. The NovaSil #737 is dimensionally stable and is resistant to various casting chemicals such as urethanes, polyesters and epoxies. Custom pot lives and cure times can be achieved with the use of different catalysts.

Performance Properties Test Test Method Results Color White (Red Catalyst) Viscosity (cps) 45,000-65,000 (300-400 Catalyst) Pot Life (minutes) 60-90 Cure Time @ 72°F (hours) 16-24 Specific Gravity 1.09 (.99 Catalyst) Shelf Life (unopened containers) 6 months Cured Rubber (7 days @ 720F) Hardness (Shore A) 30 ± 2 Elongation (ASTM D412) 315 ± 25% Tensile Strength (ASTM D412) 540 ± 25 psi Shrinkage 01% Tear, Die B (ASTM 624) 125 ± 10 ppi

MIXING INSTRUCTIONS Mix 10 parts by weight of Part A (resin) with 1 part by weight of Part B (catalyst). Mix thoroughly in a clean container by hand or by mechanical mixer until you have a uniform color. Be sure to scrape the sides and bottom of the container. Optional: If a vacuum chamber is to be used, immediately place mixed silicone rubber into chamber and pull 29 inches of mercury. Materiel will rise, then collapse. Continue the vacuum for another minute and stop. Carefully pour the catalyzed silicone rubber into the mold box or onto the pattern at its lowest point. Allow 16-24 hours for a full cure.