GT Products© GT 5811 is recommended for repetitive production of intricate shapes cast in epoxy or urethane resins. It is also used in areas where silicone oil bleed is prohibited, as this material contains no polydimethylsiloxane fluids.
Because fillers settle during storage, both GT Products©5811 and catalyst 5811 should be thoroughly stirred before mixing together. Use separate tools for mixing the two components to avoid cross contamination. GT Products©
5811 base is mixed with catalyst 5811 in a 10 : 1 ratio by weight. Add the catalyst into the base to assure complete dispersion. Mixing may be done by hand with a spatula or by machine. When machine mixing avoid prolonged high speeds to prevent premature cure. Avoid stirring in an excessive amount of air. Complete mixing is indicated by a uniform green color.
TYPICAL PROPERTIES
| Base | Catalyst | ||
|---|---|---|---|
| Color Specific Gravity Viscosity (cPs) | White 1.15 80,000 | Green 1.0 900 | |
| Mixed Viscosity Pot Life (pour time) | 38,000 1hr. | ||
| After cure (24 hr @ 25°C) | |||
| Tensile, psi:Elongation, % Durometer, Shore A Tear Strength, Die B, ppi Useful Temperature | 870 270 50 140 | ||
Range, °C (°F) -60 – 232 (-75 – 450)
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 expand to about 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.
GT Products© 5811 will cure sufficiently in eight hours at room temperature (75°F) to be handled. GT 5811 will reach 90% of ultimate cure in 24 hours at room temperature. For full cure an additional 1-2 days at room temperature or an elevated temperature cure is required.
Typical Cure Times
| 75°F | 24 | hr. |
| 100°F | 95 | min. |
| 200°F | 5 | min. |
GT Products 5811 will remain useful for six months when stored in the original unopened containers at temperatures below 80°F (27°C).
GT Products© 5811 is an addition (platinum catalyst) cure system. It will cure in contact with most clean dry surfaces. Certain materials such as butyl and chlorinated rubbers, sulfur containing materials, amines and condensation (metal soap catalyst) RTV silicones can cause cure inhibition. This inhibition will manifest itself as a sticky interface with the substrate. Inhibition can often be minimized by warming the substrate to evaporate contaminates, neutralizing and rinsing, or by the use of a suitable barrier. A sample patch test is recommended.
The above data is based on typical experience and should not be used for specification writing. Suitability of GT-Products© 5811 for a specific application should be determined under actual use conditions. No warranty, expressed or implied, is hereby made.
January 2008
GT Products inc. 501 Industrial Blvd. Grapevine, TX 76051 Phone # 800-221-0866 Fax # 817-421-1211