Brushable Platinum Silicone Rubber

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Brushable Platinum Silicone Rubber ( brushable-platinum-silicone-rubber )

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EZ-Brush® Vac Bag Silicone Brushable Platinum Silicone Rubber PRODUCT OVERVIEW www.smooth-on.com EZ-Brush® Vac Bag Silicone is a brushable platinum cure silicone developed especially for making high performance, re-usable vacuum bags. EZ-Brush® Vac Bag Silicone is easy to mix and apply. Mix ratio is 1A:1B by volume and rubber can be applied with a brush or spatula to vertical surfaces without sagging. Pot life is 30 minutes, recoat time is 1 hour. Rubber cures with negligible shrinkage to a soft, flexible rubber (Shore 20A) with very high elongation and tear strength. Newly made bags can be removed from the tool in 3.5 hours and used immediately in production with polyester or epoxy resin systems and will withstand temperatures up to 500° F /260° C. Compared to conventional vacuum bagging systems, EZ-Brush® Vac Bag Silicone is much faster at delivering a production- ready silicone bag resulting in a tremendous time and labor savings. Since bags are re-usable, long term material costs are greatly reduced. PROCESSING RECOMMENDATIONS Safety - Use in a properly ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Wear vinyl gloves only. Latex gloves will inhibit the cure of the rubber. Preparation - Materials should be stored and used at room temperature (73° F / 23° C). Warm temperatures will reduce the working time of this material. This product has a limited shelf life and should be used as soon as possible. Work environment and tool surface should also be at room temperature. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance is in question. Cure Inhibition - Platinum silicones are especially susceptible to cure inhibition by a variety of contaminants (such as sulfur and uncured epoxy resin) resulting in tackiness at the pattern interface or a total lack of cure. Latex, tin-cure silicone, sulfur clays, certain wood surfaces, newly cast polyester, epoxy or urethane rubber may cause inhibition. If compatibility between the rubber and the surface is a concern, a small-scale test is recommended. Apply a small amount of rubber onto a non-critical area of the pattern. Inhibition has occurred if the rubber is gummy or uncured after the recommended cure time has passed. To prevent inhibition, a “barrier coat” of clear acrylic lacquer sprayed directly onto the pattern is usually effective. Allow to thoroughly dry. Note: Even with a sealer, platinum silicones will not work with modeling clays containing heavy amounts of sulfur. Do a small scale test for compatibility before using on your project. If there is any question about the effectiveness of a sealer/release agent combination, a small-scale test should be made on an identical surface for trial. MEASURING & MIXING... Before you begin, pre-mix Part B thoroughly. After dispensing required amounts of Parts A and B into mixing container (1A:1B by volume or weight), mix thoroughly by hand or turbine mixer (available at your local Smooth-On distributor). Material should be mixed for 2-3 minutes making sure that you scrape the sides and bottom of the mixing container several times. After mixing parts A and B, vacuum degassing is recommended to eliminate any entrapped air. Vacuum material for 2-3 minutes (29 inches of mercury), making sure that you leave enough room in container for product volume expansion. TECHNICAL OVERVIEW Mix Ratio: 1A : 1B by volume Mixed Viscosity, cps: 20,000 (ASTM D-2393) Specific Gravity, g/cc: 1.08 (ASTM D-1475) Specific Volume, cu. in. /lb.: 25.7 (ASTM D-1475) Pot Life: 30 minutes (73° F / 23°C) (ASTM D-2471) Cure time: 3.5 hours (73° F / 23°C) Color: Translucent Green Shore A Hardness: 20 (ASTM D-2240) Tensile Strength, psi: 550 (ASTM D-412) 100% Modulus, psi: 46 (ASTM D-412) Elongation @ Break: 364% (ASTM D-412) Die B Tear Strength, pli: 120 (ASTM D-624) Shrinkage, in./in: < .001 (ASTM D-2566) All values measured after 7 days at 73°F / 23° C

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