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Tpo8 task34/30/2023 ![]() Best results are obtained using a pressure casting technique. A uniform flow will help minimize entrapped air.įor Best Results. Pouring - Pour mixture in a single spot at the lowest point of the mold. Be aware of pot life so that material does not set up in mixing container. Allow for 3 to 4 times volume expansion in mixing container. mercury in a vacuum chamber until mixture rises, breaks and falls. If you choose to vacuum the material, subject mixture to 29 h.i.g. Vacuuming - TASK™ products are low in viscosity and do not require vacuum degassing. The higher the mass concentration, the faster the material gels and cures. Be careful not to splash low viscosity material out of container. Stir slowly and deliberately making sure that you scrape the sides and bottom of the mixing container several times. Mixing - Materials should be stored and used in a warm environment (73° F / 23° C). Dispense the appropriate amount of Part B and combine with Part A. Dispense the required amount of Part A into a mixing container. Measuring - The proper mixing ratio is 1A:1B by volume or 115A:100B by weight. XTEND-IT™ Dry Gas Blanket (available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products. Immediately replacing the lids on both containers after dispensing product will help prolong the shelf life of the unused product. ![]() Remaining product should be used as soon as possible. IMPORTANT: Shelf life of product is reduced after opening. Follow with a light mist coating and let the release agent dry for 30 minutes. ![]() To ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces. A liberal coat of release agent should be applied onto all surfaces that will contact the plastic. Universal Mold Release (available from Smooth-On) is ideal for this purpose. Polyurethane, latex or metal molds should be dry and require a coat of suitable release agent. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk.īecause no two applications are quite the same, a small test application to determine suitability is recommended if performance of this material is in question.Īpplying A Release Agent - If you are unsure about surface compatibility, a trial casting on a surface finish similar to the final mold or model should be made to avoid damage to the working surface. Mixing should be done in a well-ventilated area. Mixing tools and containers should be clean and made of metal, glass or plastic. All liquid urethanes are moisture sensitive and will absorb atmospheric moisture. These products have a limited shelf life and should be used as soon as possible. Materials should be stored and used in a warm environment (73☏/23☌). ![]()
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