GT Products 5091 is a room temperature curing silicone rubber compound designed for manufacturing flexible molds.
GT Products©5091 features:
GT Products 5091 is supplied in matched kits with Catalyst 5091 designed to be used in a
10:1 ratio by weight.
Because pigments can settle during storage, Catalyst 5091 should be thoroughly stirred before mixing. Use separate tools for mixing the base and catalyst to avoid cross contamination. Low-shear mixing of the mixture is recommended. Add the catalyst to the base and mix until the color is uniform. Use clean tools and scrape the bottom and sides of the container to assure a homogeneous mixture. Avoid stirring in an excessive amount of air.
Base Catalyst
Color white Blue Specific Gravity 1.12 0.98 Viscosity (cPs) 60,000 100
Mixed Viscosity 22000 Pot Life (pour time) 60—90 min.
After cure (7 days @ 25°C)
Tensile, psi: 500 Elongation, % 525 Durometer, Shore A 15 Tear (die B) minimum 150 Linear shrinkage %: 0.3-0.4 Specific Gravity: 1.1
DEGASSING
Air entrapped during mixing should be removed to prevent voids in the cured product. Deair the mixed material under a vacuum of 25 mm (29 inches) of mercury. The mixture will froth and, expand four times its volume, crest and recede to about the original level as the bubbles break. Degassing is usually complete about two minutes after frothing subsides.
| CURING | COMPATIBILITY |
| GT Products 5091 will cure sufficiently in 16 hours at room temperature (75°F) to be handled. GT 5091 will reach 90% of ultimate cure in 24 hours at room temperature. For full cure an additional 1-2 days at room temperature is required. | GT Products 5091 is a condensation (“Tin catalyst”) cure system. It will cure in contact with most clean dry surfaces. GT Products 5091 will cure in contact with materials such as butyl and chlorinated rubbers, sulfur-containing materials, amines and other condensation RTV silicones which would inhibit the cure of addi |
| tion-cure RTV rubber. | |
| STORAGE and HANDLING | GT Products 5091 cannot be used in conjunction with GT-5235 Thixotropic additive. |
| GT Products 5091 will remain useful for six | NOTE |
| months when stored in the original unopened containers at temperatures below 80F (27°C). Both GT Products 5091 and catalyst-5091 are sensitive to moisture. Keep containers covered. . | The above data is based on typical experience and should not be used for specification writing. Suitability of GT-Products 5091 for a specific application should be determined under actual use conditions. No warranty, expressed or implied, is hereby made. |
June 2006