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1A:1B Mix By Volume Silicone Rubber No Vacuuming No Scale Easy To Use Medium softness easy to use tin cure silicone rubber - Shore 25A hardness. 1:1 mix ratio by volume - no scale or vacuum required. OOMOO 25 is easy to use silicone rubber compound that feature convenient one-to-one by volume mix ratios (no scale necessary). Material has very low viscosity for easy mixing and pouring, and vacuum degassing is usually not necessary. Products cure at room temperature with negligible shrinkage and have good tear strength. OOMOO25 is a faster version, with a 15-minute pot life and 75 minute cure time. OOMOO25 is suitable for a variety of art-related and industrial applications including making molds for sculpture and prototype reproduction, casting plaster, resins and wax No Vacuuming No Scale Easy To Use . . . OOMOO 25 is easy to use silicone rubber compound that feature convenient one-to-one by volume mix ratios (no scale necessary). Material has low viscosities for easy mixing and pouring . . . vacuum degassing is not necessary. Product cures at room temperature with negligible shrinkage. OOMOO 25 is a faster version, with a 15-minute pot life and 75 minute cure time. For The Novice Mold Maker - OOMOO silicones do not have great tear strength. They are good for making simple one- or two-piece block molds OOMOO 25 is suitable for a variety of art-related and industrial applications including making one and two-piece block molds for sculpture and prototype reproduction, casting plaster, resins and wax. OOMOO silicones are also suitable for electrical potting and encapsulation applications. Volume Resistance (ohm) (ASTM D-150-98): >1.0E+14 Volume Resistivity (ohm cm) (ASTM D-150-98): >7.363E+15 Dielectric Constant k @ 100 Hz (ASTM D-150-98): 3.33 Dissipation Factor @ 100 Hz (ASTM D-150-98): 0.01 Dielectric Strength (V/mil) (ASTM D-147-97a): 357 Coefficient of Linear Expansion (um/m- C) (ASTM E-831-06): 288 Thermal Conductivity (W/M*K) (ASTM E-1461): 0.37 Shrinkage (in./in.) (ASTM D-2566): 0.0025 Applying A Release Agent - Although not usually necessary, a release agent will make demolding easier when pouring into or over most surfaces. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question. Before you begin, pre-mix Part A thoroughly to re-disperse fillers that may have settled. After dispensing equal amounts of Parts A and B into mixing container, mix thoroughly for 3 minutes making sure that you scrape the sides and bottom of the mixing container several times. Mixture should have a uniform color with no color streaks. If you observe color streaks, continue mixing until they are eliminated. POURING, CURING & PERFORMANCE ... Pouring For best results, pour your mixture in a single spot at the lowest point of the containment field. Let the rubber seek its level up and over the model. A uniform flow will help minimize entrapped air. The liquid rubber should level off at least 1/2 (1.3 cm) over the highest point of the model surface. Curing Allow to cure as prescribed (75 minutes for OOMOO 25 at room temperature (73 F/23 C) before demolding. Post curing the mold an additional 4 hours at 150 F (65 C) will eliminate any residual moisture and alcohol which is a by product of the condensation process and may inhibit some resins. Allow mold to cool to room temperature before using. Do not cure rubber where temperature is less than 65 F/18 C. Using The Mold No release agent is necessary when casting wax or gypsum. Applying a release agent prior to casting polyurethane, polyester and epoxy resins is recommended to prevent sticking and mold degradation. Mold Performance & Storage The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete will quickly erode mold detail, while casting non-abrasive materials (wax) will not affect mold detail. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled. Molds should be stored on a level surface in a cool, dry environment. (Casting silicone rubber - no scale or vacuum required was posted and is owned by: Tommy Lang) |
T.Lang@chicagopartsnetwork.com (Tommy Lang) for more information.
