{"product_id":"smooth-cast-300-series","title":"Smooth-Cast™ 300","description":"\u003cp\u003eThe \u003cstrong\u003eSmooth-Cast™ 300 Series\u003c\/strong\u003e of liquid plastics are ultra-low viscosity casting resins that yield castings that are\u003cstrong\u003e bright white and virtually bubble free\u003c\/strong\u003e. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.\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\/smooth-cast-300\/#\" 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\/847326034?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\u003eThese resins readily accept fillers (such as \u003cstrong\u003eURE-FIL™ 3\u003c\/strong\u003e ) and can be colored with \u003cstrong\u003eSO-Strong™\u003c\/strong\u003e or Ignite™ color tints (\u003cstrong\u003eSmooth-Cast™ 325\u003c\/strong\u003e series accepts pigments better than the \u003cstrong\u003eSmooth Cast™ 300 \u003c\/strong\u003eseries). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for \u003cstrong\u003eSmooth-Cast™ 300 \u003c\/strong\u003eSeries Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.\u003c\/p\u003e\n\u003cp\u003eThose interested in making roto cast pieces should refer to the \u003cstrong\u003eSmooth-Cast™ 65D\u003c\/strong\u003e technical bulletin.\u003c\/p\u003e\n\u003cp\u003eFeatures\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to measure and mix\u003c\/strong\u003e - 1:1 mix ratio by volume - no scale required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow viscosity\u003c\/strong\u003e - captures excellent detail - no degassing necessary\u003c\/li\u003e\n\u003cli\u003eResin cures to a \u003cstrong\u003ebright white\u003c\/strong\u003e finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg height=\"467\" width=\"937\" alt=\"\" src=\"https:\/\/cdn.shoplightspeed.com\/shops\/606431\/files\/56917713\/smoothcast300q300305310specs.png\"\u003e\u003c\/p\u003e\n\u003cp\u003eInstructions\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eSafety\u003c\/strong\u003e\u003c\/em\u003e - Materials should be stored and used in a warm environment (73° F \/ 23° C). These products have a limited shelf life and should be used as soon as possible. All liquid urethanes are \u003cstrong\u003emoisture sensitive and will absorb atmospheric moisture\u003c\/strong\u003e. Mixing tools and containers should be clean and made of metal, glass or plastic. Mixing should be done in a well-ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Because 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\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eApplying A Release Agent\u003c\/strong\u003e\u003c\/em\u003e - A 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 or Mann’s \u003cstrong\u003eEase Release™ 200 \u003c\/strong\u003eavailable from Smooth-On or your Smooth-On distributor). A liberal coat of release agent should be applied onto all surfaces that will contact the plastic.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e\u003c\/em\u003e To ensure thorough coverage, apply release and brush with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes. Smooth-On silicone rubber molds usually do not require a release agent unless casting silicone into the mold. Applying a release agent will prolong the life of the mold.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMEASURING \u0026amp; MIXING\u003c\/strong\u003e\u003c\/em\u003e... Liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal, glass or plastic. Materials should be stored and used in a warm environment (73°F\/23°C).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStir or shake both Part A \u0026amp; Part B thoroughly before dispensing\u003c\/strong\u003e. After dispensing equal amounts of Parts A and B into mixing container (100A:90B by weight) and mix \u003cstrong\u003ethoroughly\u003c\/strong\u003e. Stir deliberately making sure that you scrape the sides and bottom of the mixing container several times. Be careful not to splash low viscosity material out of the container.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePOURING, CURING \u0026amp; PERFORMANCE\u003c\/strong\u003e\u003c\/em\u003e...\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePouring\u003c\/strong\u003e\u003c\/em\u003e - Pour your mixture in a single spot at the lowest point of the containment field and let the mixture seek its level. This will help minimize air entrapment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor Best Results \u003c\/strong\u003e. . . Best results are obtained using a pressure casting technique. After pouring the mixed compound, the entire casting assembly (mold, dam structure, etc.) is placed in a pressure chamber and subjected to 60 PSI (4.2 kg\/cm2) air pressure for the full cure time of the material.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCuring - Important: \u003c\/strong\u003e\u003c\/em\u003eUse this product with at least room size ventilation or in proximity to a forced outlet air vent and do not inhale\/breath fumes. Fumes, which may be visible with a significant mass concentration, will quickly dissipate with adequate ventilation. Castings with significant mass may be hot to the touch and irritate skin immediately following cure. Let casting cool to room temperature before handling.\u003c\/p\u003e\n\u003cp\u003eDemold time of the finished casting depends on mass and mold configuration. Low mass or thin-walled castings will take longer to cure than castings with higher mass concentration. \u003cstrong\u003eSmooth-Cast™ 300\u003c\/strong\u003e will cure in 7 - 10 minutes (\u003cstrong\u003eSmooth-Cast™ 305\u003c\/strong\u003e in 30 – 40 minutes and \u003cstrong\u003eSmooth-Cast™ 310\u003c\/strong\u003e in 2 - 4 hours) depending on mass and mold configuration.\u003c\/p\u003e\n\u003cp\u003eIf making rotational or hollow castings, backfilling with a rigid foam (\u003cstrong\u003eFoam-iT!™ 5\u003c\/strong\u003e or other) will provide lightweight reinforcement. Foam backfilling is recommended if castings will be subjected to temperatures above 85°F \/ 30°C.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePost Cure\u003c\/strong\u003e\u003c\/em\u003e - Castings will reach “full cure” faster and achieve maximum physical properties if post cured. Allow material to cure for recommended Cure Time at room temperature followed by 4 - 6 hours at 150°F\/65°C. Allow casting to come to room temperature before handling.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePerformance\u003c\/strong\u003e\u003c\/em\u003e - Cured castings are rigid and durable. They resist moisture, moderate heat, solvents, dilute acids and can be machined, primed\/ painted or bonded to other surfaces (any release agent must be removed). If machining cured material, wear dust mask or other apparatus to prevent inhalation of residual particles. Castings can be displayed outdoors after priming and painting. Unpainted castings will yellow over time - more quickly when exposed to ultra-violet light.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.smooth-on.com\/msds\/files\/SC_300_300Q_320_380_45D_60D_61D_65D_66D_ONYX.pdf\" target=\"_blank\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e","brand":"Smooth-On","offers":[{"title":"Trial Kit (1.9 lbs. \/ 0.86 kg.)","offer_id":48015530230075,"sku":"47644","price":24.99,"currency_code":"USD","in_stock":false},{"title":"2 Gallon Kit (15.4 lbs. \/ 6.99 kg.)","offer_id":48015530262843,"sku":"47661","price":124.99,"currency_code":"USD","in_stock":true},{"title":"10 Gallon Kit (77 lbs. \/ 34.93 kg.)","offer_id":48015530295611,"sku":"47671","price":491.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/Smooth-Cast-300-combo-1400x1050.jpg?v=1754775687","url":"https:\/\/maacaffestore.com\/products\/smooth-cast-300-series","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}