GTP KastStone
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Description GTP KastStone is a two component, ceramic filled, rapid setting urethane molding compound. When fully cured, GTP KastStone attains high compression and heat distortion characteristics, which makes it ideal for patterns, or prototype models. GTP KastStone’s high ceramic filler loading also adds some unusual insulation qualities.
Application Mold surfaces should be clean and free of dust and moisture. An even coat of silicone mold release (Ease Release 2251) is applied taking care to avoid puddling or drips. Porous surfaces (plaster or wood) must be completely sealed using sand and sealer or Johnson’s Paste Wax.
GTP KastStone is a rapid setting, two components having high ceramic filler loading and requires special preparation before using. Component A and B typically must be premixed prior to combining for final mixing.
Mix Ratio Proper mixing can be made using a spatula or jiffy mixer. Mixing of the ceramic filler and liquid resin should be done by carefully scraping the sides and bottom of the container to attain an even mixture. Components A and B should be used immediately to avoid separation or moisture contamination. Measure out equal portions by volume of Component A and Component B. Mix with spatula or jiffy mixer (for larger batches). Pour mixed resin into prepared mold. Allow curing 30 to 45 minutes before demolding. GTP KastStone is fully cured in 24
| hours. | |||
|---|---|---|---|
| Typical Properties Component A | Viscosity 1000 cps | Specific Gravity 0.80 | Weight Per Gallon 6.67 lb. |
| Component B | 2100 cps | 0.70 | 5.81 lb. |
| Mixed | 1500 cps | 0.75 | 6.24 lb. |
| Mixing Ratio | By volume | 1 part A to 1 part B | |
| By weight | 100 parts A to 87 parts B | ||
| Work life | 3-5 minutes @ 72° F | ||
Demold time 1 hour-thin walled parts, 10-20 minutes-thicker cross section Set time and Demold depend on temperature and relative humidity
Physical Properties Test Method Value Hardness ASTM 2240 65 Shore D Tensile strength N/A 3500 Elongation N/A 1 % Density 0.88 Weight (cubic inch) 0.032 lb. (14.53 gram) Shrinkage (thicker cross section may be more) 0.125 % Color Light Gray
Shelf Life GTP KastStone is shipped from the factory in sealed containers. The containers should be stored in a cool, dry area that is protected from direct sunlight and moisture. Storage temperatures should not exceed 80° F. The shelf life of factory sealed containers stored under these conditions is six months. Containers that have been opened should be resealed immediately after material has been removed in order to prevent solvent evaporation.
Packaging GTP KastStone is available in convenient 2-quart, 2-gallon, 8-gallon and 96-gallon kits. GTP KastStone has a non-hazardous rating for shipping.