Low-durometer thixotropic tin-cure RTV-2 brush-on silicone

General Information

GI-739 is a thixotropic (resistant to flow) tin catalyzed silicone designed to be used when painting or spraying onto vertical surfaces. GI-739 does not contain the mold rotting thixo-additives widely used today, but offers the end user the same ease of use and detail reproducibility. When catalyzed with one of our library life extending catalysts (see supplemental products) and stored correctly, a longer life of the cured mold should be expected. Its high tear strength, elongation and tensile strength make it an excellent choice for any mold making application. It is also resistant to inhibition by most common mold making substrates, eliminating the need to use mold sealers.

Typical Properties

Uncatalyzed Compound

Color

Base:WhiteActivator:Teal

Viscosity

Base:500,000cpsActivator:1,000cps

Mixing Ratio

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

Mixed Viscosity

300,000–350,000cps

Working Time

0.7–1.0hours

Cure Time

16–18hours

Shelf Life

6months

Vulcanized (Cured) Properties

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

Shore A Hardness

One day:157 days:18

±4 durometer

Tear Resistance

70 ± 10ppiASTM D624

Tensile Strength

275 ± 25psiASTM D412

Elongation

500 ± 50%ASTM D412

Service Temperature

-60 to 350°F

Shrinkage

0.10%

Specific Gravity

1.10

Coverage

25.2in³ / lb