{"product_id":"smooth-on-pmc-780-80a-dry","title":"Smooth-On PMC 780 Dry - 1.25 Quart","description":"\u003cdiv class=\"info\"\u003e\n\u003cp\u003e\u003cstrong\u003ePMC™-780\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePMC™-780 DOES NOT CONTAIN MOCA\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e– a known cancer causing agent and hazard. Mixed two parts A to one part B by weight or volume,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePMC™-780\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eurethane pours easily and cures at room temperature with negligible shrinkage to a solid Shore 80A rubber.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePick The One Best Suited For Your Application:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOriginal PMC™-780 Dry does not exude oil.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNew\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePMC™-780 Wet\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003econtains 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\u003c\/div\u003e\n\u003cdiv class=\"features\"\u003e\n\u003ca name=\"features\"\u003e\u003c\/a\u003e\n\u003ch4\u003e\u003cspan style=\"text-decoration: underline;\"\u003eFeatures\u003c\/span\u003e\u003c\/h4\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.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePMC™-780 Dry\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis 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\u003e\u003cstrong\u003eFOR COMMERCIAL\/INDUSTRIAL USE ONLY\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cspan style=\"text-decoration: underline;\"\u003eInstructions\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePreparation\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e \u003c\/span\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\u003cspan\u003e \u003c\/span\u003e\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.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eSuperSeal™\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOne Step™\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(available from Smooth-On) is a fast drying sealer suitable for sealing porous surfaces without interfering with surface detail. You can also use\u003cspan\u003e \u003c\/span\u003e\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\u003cspan\u003e \u003c\/span\u003ethe 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\u003cspan\u003e \u003c\/span\u003e\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 -\u003cspan\u003e \u003c\/span\u003e\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\u003cspan\u003e \u003c\/span\u003eavailable 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:\u003cspan\u003e \u003c\/span\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.\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\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003cspan\u003e \u003c\/span\u003e\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.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eXTEND-IT™ Dry Gas Blanket\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(available from Smooth-On) will significantly prolong the shelf life of unused liquid urethane products.\u003c\/p\u003e\n\u003chr\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\u003cspan\u003e \u003c\/span\u003eAfter 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\u003cspan\u003e \u003c\/span\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\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003ePouring\u003c\/em\u003e\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\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.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eA uniform flow will help minimize entrapped air.\u003cspan\u003e \u003c\/span\u003e\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\u003cspan\u003e \u003c\/span\u003e\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\u003cspan\u003e \u003c\/span\u003e\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\u003cspan\u003e \u003c\/span\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\u003cspan\u003e \u003c\/span\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\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ewax, liquid rubber or thermosetting materials\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\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\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003egypsum plaster materials,\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esponge the mold with a soap solution for better plaster flow and easy release.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eIn \u0026amp; Out™ II Water Based Release Concentrate\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e(available from Smooth-On) is recommended for releasing abrasive materials like\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003econcrete.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePerformance \u0026amp; Storage\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e \u003c\/span\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\u003c\/div\u003e\u003cp\u003eBrowse \u003ca href=\"\/fr\/collections\/smooth-on\"\u003eSmooth-On mould-making and casting materials\u003c\/a\u003e, or \u003ca href=\"\/fr\/pages\/contact\"\u003eask Go Industrial for product-selection and ordering help\u003c\/a\u003e.\u003c\/p\u003e","brand":"Smooth-On","offers":[{"title":"Default Title","offer_id":46712249614636,"sku":"117408","price":69.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0779\/3426\/4620\/files\/smooth-on-pmc-780-dry.png?v=1781730613","url":"https:\/\/goindustrial.com\/fr\/products\/smooth-on-pmc-780-80a-dry","provider":"Go Industrial","version":"1.0","type":"link"}