Low-viscosity tin-cure RTV-2 silicone for urethane casting

General Information

GI-384 is a high tear strength, tin-catalyzed RTV-2 silicone rubber, which was designed for casting solid polyurethane resins, polyurethane foams and other plastic parts. GI-384 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. GI-384 is extremely useful for those applications where a strong flexible rubber is required.

Typical Properties

Uncatalyzed Compound

Color

Base:WhiteActivator:Red

Viscosity

Base:22,000–32,000cpsActivator:300–400cps

Mixing Ratio

By weight:100:5By volume:100:5.6

Mixed Viscosity

10,000–20,000cps

Working Time

2.0–3.0hours

Cure Time

16–18hours

Shelf Life

6months

Vulcanized (Cured) Properties

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

Shore A Hardness

One day:177 days:30

±4 durometer

Tear Resistance

125 ± 25ppiASTM D624

Tensile Strength

450 ± 25psiASTM D412

Elongation

425 ± 25%ASTM D412

Service Temperature

-60 to 350°F

Shrinkage

0.10%

Specific Gravity

1.10

Coverage

25.2in³ / lb