{"product_id":"pmc-780-dry","title":"PMC™-780 DRY","description":"\u003cp\u003e\u003cstrong\u003ePMC™-780\u003c\/strong\u003e is a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance. \u003cstrong\u003ePMC™-780 DOES NOT CONTAIN MOCA \u003c\/strong\u003e– a known cancer causing agent and hazard. Mixed two parts A to one part B by weight or volume, \u003cstrong\u003ePMC™-780\u003c\/strong\u003e urethane pours easily and cures at room temperature with negligible shrinkage to a solid Shore 80A rubber.\u003c\/p\u003e\n\u003cdiv class=\"slide-gallery\"\u003e\n\u003cdiv class=\"slider-main slider-main-1\"\u003e\n\u003ca href=\"https:\/\/www.smooth-on.com\/products\/pmc-780-dry\/#\" class=\"slider-control slider-left slider-1-left\" rel=\"undefined\"\u003e\u003c\/a\u003e\n\u003cdiv style=\"display: inline-block; width: 100%; max-width: 800px;\"\u003e\n\u003cdiv id=\"slider-wistia-mother-1\" class=\"wistia_responsive_padding\" style=\"padding: 56.25% 0 0 0; position: relative;\"\u003e\n\u003cdiv class=\"wistia_responsive_wrapper\" style=\"height: 100%; left: 0; position: absolute; top: 0; width: 100%;\"\u003e\u003ciframe src=\"https:\/\/player.vimeo.com\/video\/849239154?badge=0\u0026amp;autopause=0\u0026amp;title=0\u0026amp;portrait=0\u0026amp;byline=0\u0026amp;player_id=0\u0026amp;app_id=58479\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003ePick The One Best Suited For Your Application:\u003c\/strong\u003e \u003cstrong\u003eOriginal PMC™-780 Dry does not exude oil.\u003c\/strong\u003e New \u003cstrong\u003ePMC™-780 Wet\u003c\/strong\u003e contains a built in release agent to aid in demolding concrete. (Note: “wet” rubber has a higher net shrinkage value over time vs. “dry “ rubber.)\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"622\" width=\"404\" alt=\"\" src=\"https:\/\/cdn.shoplightspeed.com\/shops\/606431\/files\/50690296\/pmc780dryspecs.png\"\u003e\u003c\/p\u003e\n\u003cp\u003eFeatures\u003c\/p\u003e\n\u003cp\u003eBoth are used around the world for casting abrasive materials such as concrete (pre-cast concrete, making concrete stamping pads, etc.) and gypsum plasters with high exotherms. \u003cstrong\u003ePMC™-780 Dry\u003c\/strong\u003e is also commonly used to make rubber mechanical parts of varying configurations (gaskets, wheels, and pullies) as well as ball mill liners and vibration\/shock pads.\u003c\/p\u003e\n\u003cp\u003eInstructions\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePreparation\u003c\/strong\u003e\u003c\/em\u003e - This product has a limited shelf life and should be used as soon as possible. Materials should be stored and used at room temperature (73°F\/23°C). Humidity should be low. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Good ventilation (room size) is necessary.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eSome Materials Must Be Sealed \u003c\/strong\u003e\u003c\/em\u003e- To prevent adhesion between the rubber and model surface, models made of porous materials (gypsum plasters, concrete, wood, stone, etc.) must be sealed prior to applying a release agent. \u003cstrong\u003eSuperSeal™\u003c\/strong\u003e or \u003cstrong\u003eOne Step™\u003c\/strong\u003e (available from Smooth-On) is a fast drying sealer suitable for sealing porous surfaces without interfering with surface detail. You can also use \u003cstrong\u003eSonite™ Wax\u003c\/strong\u003e. A high quality Shellac is suitable for sealing modeling clays that contain sulfur or moisture (water based).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIn all cases,\u003c\/strong\u003e the sealing agent should be applied and allowed to completely dry prior to applying a release agent.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eNon-Porous Surfaces \u003c\/em\u003e\u003c\/strong\u003e- Metal, glass, hard plastics, sulfur free clays, etc. require only a release agent.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplying A Release Agent - \u003c\/strong\u003eA release agent is necessary to facilitate demolding when casting into or over most surfaces. Use a release agent made specifically for mold making (\u003cstrong\u003eUniversal™ Mold Release\u003c\/strong\u003e available from Smooth-On). A liberal coat of release agent should be applied onto all surfaces that will contact the rubber.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT: \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.\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\u003e\u003cstrong\u003eIMPORTANT: \u003c\/strong\u003eShelf life of product is drastically reduced after opening. Immediately replacing the lids on containers after dispensing product will prolong the shelf life of the unused product. \u003cstrong\u003eXTEND-IT™ Dry Gas Blanket\u003c\/strong\u003e (available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMEASURING \u0026amp; MIXING...\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLiquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal or plastic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT: Pre Mix the Part B before using.\u003c\/strong\u003e After dispensing the required amounts of Parts A and B into mixing container, mix thoroughly for at least 3 minutes making sure that you scrape the sides and bottom of the mixing container several times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIf Mixing Large Quantities\u003c\/strong\u003e (24 lbs.\/11 kgs. or more) at one time, we suggest using a mechanical mixer (i.e. Squirrel Mixer or equal) for 3 minutes followed by careful hand mixing for one minute as directed above. Then, pour entire quantity into a new, clean mixing container and do it all over again.\u003c\/p\u003e\n\u003cp\u003eAlthough this product is formulated to minimize air bubbles in the cured rubber, vacuum degassing will further reduce entrapped air. A pressure casting technique using a pressure chamber can yield totally bubble free castings. Contact SmoothOn or your distributor for further information about vacuum degassing or pressure casting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003ePouring\u003c\/em\u003e\u003c\/strong\u003e - 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. \u003cstrong\u003eA uniform flow will help minimize entrapped air. \u003c\/strong\u003eThe 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\u003cem\u003e\u003cstrong\u003eCuring \u003c\/strong\u003e\u003c\/em\u003e- Allow the mold to cure (at least 48 hours) at room temperature (73°F\/23°C) before demolding. Do not cure rubber in temperatures less than 65°F\/18°C. Cure time can be reduced with mild heat or by adding Smooth-On \u003cstrong\u003eKick-It™ Cure Accelerator\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003ePost Curing\u003c\/em\u003e\u003c\/strong\u003e - After rubber has cured at room temperature, heating the rubber to 150°F (65°C) for 4 to 8 hours will increase physical properties and performance.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eUsing The Mold\u003c\/strong\u003e\u003c\/em\u003e - If using as a mold material, a release agent should be applied to the mold before each casting. The type of release agent to use depends on the material being cast. The proper release agent for \u003cstrong\u003ewax, liquid rubber or thermosetting materials\u003c\/strong\u003e (i.e. Smooth-On liquid plastics) is a spray release made specifically for mold making (available from Smooth-On or your distributor). Prior to casting \u003cstrong\u003egypsum plaster materials,\u003c\/strong\u003e sponge the mold with a soap solution for better plaster flow and easy release. \u003cstrong\u003eIn \u0026amp; Out™ II Water Based Release Concentrate \u003c\/strong\u003e(available from Smooth-On) is recommended for releasing abrasive materials like \u003cstrong\u003econcrete.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePerformance \u0026amp; Storage\u003c\/strong\u003e\u003c\/em\u003e - Fully cured rubber is tough, durable and will perform if properly used and stored. The physical life of the rubber depends on how you use it. Contact Smooth-On directly with questions about this material relative to your application.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.smooth-on.com\/msds\/files\/609A_1_609B_1.pdf\" target=\"_blank\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e","brand":"Smooth-On","offers":[{"title":"Trial Kit (3 lbs. \/ 1.36 kg.)","offer_id":48015656091963,"sku":"60944","price":45.99,"currency_code":"USD","in_stock":false},{"title":"3 Gallon Kit (24 lbs. \/ 10.89 kg.)","offer_id":48015656124731,"sku":"60961","price":239.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/pmc780drycombo.jpg?v=1713396408","url":"https:\/\/maacaffestore.com\/products\/pmc-780-dry","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}