High-tear tin-cure RTV-2 mold making silicone

General Information

GI-1000 is an extremely high tear strength, tin-catalyzed RTV-2 silicone rubber, which was designed for casting polyester parts. GI-1000 is not sensitive to inhibition, meaning it will cure at room temperature over virtually any surface. It is easy to mix and de-air, and will cure with only a slight degree of shrinkage. The speed at which the rubber hardens can be accelerated with special activators. Condensation cure two-component silicone rubbers are excellent for most general mold making and prototype applications. They are excellent for casting waxes, gypsum, epoxies and other plastics. GI-1000 is extremely useful for those applications where superior mechanical properties are required.

Typical Properties

Uncatalyzed Compound

Color

Base:WhiteActivator:Blue

Viscosity

Base:50,000–70,000cpsActivator:300–400cps

Mixing Ratio

By weight:100:10By volume:100:11.1

Mixed Viscosity

30,000–45,000cps

Working Time

1.5–2.5hours

Cure Time

16–18hours

Shelf Life

6months

Vulcanized (Cured) Properties

Measured at 7 days, 70°F / 50% relative humidity

Shore A Hardness

One day:287 days:32

±4 durometer

Tear Resistance

120 ± 10ppiASTM D624

Tensile Strength

525 ± 25psiASTM D412

Elongation

300 ± 25%ASTM D412

Service Temperature

-60 to 350°F

Shrinkage

0.10%

Specific Gravity

1.09

Coverage

25.4in³ / lb

Volume resistivity

1 x 10^15 ohms/cm

Dielectric strength

500 volts/mil

Dissipation factor (@ 100 Hz)

0.019

Dielectric constant (@ 100 Hz)

3.3