{"product_id":"smooth-sil™-945","title":"Smooth‑Sil™ 945","description":"\u003cdiv class=\"info\"\u003e\n\u003cp\u003eSmooth-On \u003cstrong\u003eSmooth-Sil™\u003c\/strong\u003e Platinum Silicones cure at room temperature with negligible shrinkage. With different hardnesses to choose from, \u003cstrong\u003eSmooth-Sil™\u003c\/strong\u003e products offer tremendous versatility and are suitable for making production molds of any configuration, large or small. These silicones exhibit good chemical, abrasion and heat resistance. Materials such as plasters, concrete, wax, low-melt metal alloys or resins (urethane, epoxy or polyester) can then be cast into these silicone rubbers without a release agent.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSmooth-Sil™\u003c\/strong\u003e Platinum Silicones are used for rapid prototyping, wax casting (foundries and candle makers), architectural restoration and for casting concrete. \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/smoothsilspecs.jpg?v=1741299340\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"features\"\u003e\n\u003ca name=\"features\"\u003e\u003c\/a\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCured \u003cstrong\u003eSmooth-Sil™ 945\u003c\/strong\u003e is \u003cstrong\u003eskin safe\u003c\/strong\u003e and certified by an independent laboratory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth-Sil™ 945\u003c\/strong\u003e offers the convenience of a \u003cstrong\u003e1A:1B by volume\u003c\/strong\u003e mix ratio and a fast\u003cstrong\u003e 6 hour cure time.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstructions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eSafety \u003c\/em\u003e–\u003c\/strong\u003e Use in a properly ventilated area (“room size” ventilation). 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. \u003cstrong\u003eStore and use material at room temperature (73°F\/23°C). \u003c\/strong\u003eWarmer temperatures will drastically reduce working time and cure time. Storing material at warmer temperatures will also reduce the usable shelf life of unused material. These products have a limited shelf life and should be used as soon as possible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eCure Inhibition\u003c\/em\u003e – \u003c\/strong\u003eAddition-cure silicone rubber may be inhibited by certain contaminants in or on the pattern to be molded resulting in tackiness at the pattern interface or a total lack of cure throughout the mold. Latex, tin-cure silicone, sulfur clays, certain wood surfaces, newly cast polyester, epoxy or urethane rubber my 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBecause 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. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo prevent inhibition, one or more coatings of a clear acrylic lacquer applied to the model surface is usually effective. Allow any sealer to thoroughly dry before applying rubber. 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eApplying A Release Agent\u003c\/em\u003e -\u003c\/strong\u003e Although not usually necessary, a release agent will make demolding easier when pouring into or over most surfaces.\u003cstrong\u003e Ease Release™ 200\u003c\/strong\u003e is a proven release agent for making molds with silicone rubber. Mann Ease Release™ products are available from Smooth-On or your Smooth-On distributor.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eIMPORTANT:\u003c\/em\u003e \u003c\/strong\u003eTo ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces of the model. Follow with a light mist coating and let the release agent dry for 30 minutes. 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMEASURING \u0026amp; MIXING...\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eBefore you begin, pre-mix Part B thoroughly to re-disperse pigments that may have settled. Dispense equal amounts of parts A and B into a mixing container and mix for 3 minutes. Scrape the sides and bottom of the container several times. After mixing parts A and B, vacuum degassing is recommended to eliminate any entrapped air in liquid rubber. Your vacuum pump must pull a minimum of 29 inches of mercury (or 1 Bar \/ 100 KPa). Leave enough room in container for material expansion. Vacuum material until it rises, breaks and falls. Vacuum for 1 minute after material falls.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eCuring \/ Post Curing \u003c\/em\u003e- \u003c\/strong\u003eAllow rubber to cure as prescribed at room temperature (73°F\/23°C) before demolding. Do not cure rubber where temperature is less than 65°F\/18°C. \u003cstrong\u003eOptional:\u003c\/strong\u003e Post curing the mold will aid in quickly attaining maximum physical and performance properties. After curing at room temperature, expose the rubber to 176°F\/80°C for 2 hours and 212°F\/100°C for one hour. Allow mold to cool to room temperature before using.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eUsing The Mold\u003c\/em\u003e -\u003c\/strong\u003e When first cast, silicone rubber molds exhibit natural release characteristics. Depending on what is being cast into the mold, mold lubricity may be depleted over time and parts will begin to stick. No release agent is necessary when casting wax or gypsum. Applying a release agent such as \u003cstrong\u003eEase Release™ 200\u003c\/strong\u003e (available from Smooth-On) prior to casting polyurethane, polyester and epoxy resins is recommended to prevent mold degradation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThickening Smooth-Sil™ Silicones\u003c\/em\u003e - THI-VEX™\u003c\/strong\u003e is made especially for thickening Smooth-On’s silicones for vertical surface application (making brush-on molds). Different viscosities can be attained by varying the amount of \u003cstrong\u003eTHI-VEX™\u003c\/strong\u003e. See the \u003cstrong\u003eTHI-VEX™\u003c\/strong\u003e technical bulletin (available from Smooth-On or your Smooth-On distributor) for full details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eThinning Smooth-Sil™ Silicones\u003c\/em\u003e -\u003c\/strong\u003e Smooth-On’s \u003cstrong\u003eSilicone Thinner™\u003c\/strong\u003e will lower the viscosity of \u003cstrong\u003eSmooth-Sil™\u003c\/strong\u003e for easier pouring and vacuum degassing. A disadvantage is that ultimate tear and tensile are reduced in proportion to the amount of \u003cstrong\u003eSilicone Thinner™\u003c\/strong\u003e added. \u003cstrong\u003eIt is not recommended to exceed 10% by weight of total system (A+B).\u003c\/strong\u003e See the \u003cstrong\u003eSilicone Thinner™\u003c\/strong\u003e technical bulletin (available from Smooth-On or your Smooth-On distributor) for full details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eMold Performance \u0026amp; Storage\u003c\/em\u003e -\u003c\/strong\u003e The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete can 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.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.smooth-on.com\/sds\/10001608-10001659.pdf\" target=\"_blank\" title=\"SDS\" rel=\"noopener\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Smooth-On","offers":[{"title":"Trial Kit (2 lbs. \/ 0.91 kg.)","offer_id":50082541076795,"sku":"37044","price":37.99,"currency_code":"USD","in_stock":true},{"title":"2 Gallon Kit (18 lbs. \/ 8.16 kg.)","offer_id":50082541109563,"sku":"37061","price":277.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/Smooth-Sil-945-gallon-1400x1050.jpg?v=1754769335","url":"https:\/\/maacaffestore.com\/products\/smooth-sil%e2%84%a2-945","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}