GI 1220 Tin Silicone

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GI-1220 Product Information General Information GI-1220 is a high tear strength, tin-catalyzed RTV-2 silicone rubber, which was designed for casting polyester parts.

GI-1220 offers the same advantages of GI-1120 at a lower viscosity. GI-1220 is especially good for molds with deep undercuts and for molds that require flexing for part removal. GI-1220 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-1220 is extremely useful for those applications where superior elongation and medium durometer are required.

Typical Properties Uncatalyzed Compound Color Viscosity(cps) Mixing Ratio (B/A) Viscosity(cps) Working Time Cure Time Shelf Life Base: White Base: 30,000-40,000 By weight: 100 / 10 Mixed: 15,000-25,000 1.5 to 2.5 hours 16-18 hours 6 months Activator: Blue Activator: 300-400 By volume: 100 / 10.9 Vulcanized (cured) Properties (7 days @ 70° F / 50% relative humidity) Shore A Hardness (±4) Tear Resistance (ASTM D624) Tensile Strength (ASTM D412) Elongation (ASTM D412) Service Temperature (° F) Shrinkage Specific Gravity Coverage (in3 / lb) Dielectric Strength (volts/mil) Dielectric Constant (@ 100 HZ) Dissipation Factor (@ 100 HZ) Volume Resistivity (ohms/cm) One day: 15 95 ± 10 ppi 390 ± 25 psi 475 ± 25 % -60 to 340 0.10 % 1.08 25.6 n.a. n.a. n.a. n.a. 7 Days: 20



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