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Silicones Inc GI-1120

Silicones GI-1120 is a high tear strength, tin-catalyzed RTV-2 silicone rubber, which was designed for casting polyester parts. GI-1120 is especially good for molds with deep undercuts and for molds that require flexing for part removal.

Polymer Name: Silicone Elastomer

End Uses: Prototyping

Features: Good Tear Strength, High Elongation, Room Temperature Vulcanizing

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Identification & Functionality

Chemical Family
Polymer Name
Technologies

Features & Benefits

Applications & Uses

Markets
Compatible Polymers & Resins
Cure Method
Plastics & Elastomers End Uses
Applications

GI-1120 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-1120 is extremely useful for those applications where superior elongation and medium durometer are required.

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Coverage25.6in^3 / lb-
Cure Time (Hours)16 - 18--
Elongation475 ± 25%ASTM D412
Mixing Ratio (B/A)100 / 10--
Service Temperature-60 - 340°F-
Hardness (±4)15.0Shore A-
Shrinkage0.1%-
Specific Gravity1.08--
Tear Resistance95 ± 10ppiASTM D624
Tensile Strength390 ± 25psiASTM D412
Viscosity45000 - 55000cps-
Viscosity25000 - 35000cps-
Working Time (Hours)1.5 - 2.5--

Storage & Handling

Shelf Life
6 months