{"product_id":"epoxacast-690","title":"EpoxAcast™ 690","description":"\u003cp\u003e\u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e is a clear casting epoxy resin suitable for a variety of industrial and art-related projects requiring a rigid, clear finished casting. It is mixed 100A:30B by weight (gram scale required) and features a very low viscosity for easy mixing and minimal bubble entrapment. Working time is 5 hours and cure time is 24 hours at room temperature. Castings cure with negligible shrinkage and are very hard and strong. Resin can be colored with\u003cstrong\u003e UVO™\u003c\/strong\u003e or\u003cstrong\u003e IGNITE™\u003c\/strong\u003e colorants. This product is not moisture sensitive and can be used in humid environments. Recommended casting thickness maximum per layer is 3\/8 in. \/ 0.95 cm.\u003c\/p\u003e\n\u003cp\u003eFeatures\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOptically clear\u003c\/li\u003e\n\u003cli\u003ePerfect for lenses or encapsulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg height=\"715\" width=\"530\" alt=\"\" src=\"https:\/\/cdn.shoplightspeed.com\/shops\/606431\/files\/56948373\/epoxacast690692specs.png\"\u003e\u003c\/p\u003e\n\u003cp\u003eInstructions\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePreparation\u003c\/strong\u003e\u003c\/em\u003e – Avoid breathing fumes - use in a well ventilated area at minimum. NIOSH approved respirator is recommended. Wear safety glasses, long sleeves and rubber gloves to minimize skin contact.\u003c\/p\u003e\n\u003cp\u003eMaterials should be stored and used in a room temperature environment (73°F\/23°C). Elevated temperatures will reduce Pot Life. \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e Resin and Hardener must be properly measured and thoroughly mixed to achieve full, highstrength, solid-cure properties.\u003c\/p\u003e\n\u003cp\u003e\u003cem\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\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eApplying A Release Agent\u003c\/strong\u003e\u003c\/em\u003e – For releasing epoxy from non-porous surfaces such as resin, metal, glass etc., use \u003cstrong\u003eEase Release™ 200 or 205\u003c\/strong\u003e (available from Smooth-On) to prevent adhesion.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e To ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces of the mold or model. Follow with a light mist coating and let the release agent dry for 30 minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMeasuring \/ Dispensing\u003c\/strong\u003e\u003c\/em\u003e – The proper mixing ratio is 100 parts of EpoxAcast™ 690 resin to 30 parts hardener by weight. \u003cstrong\u003eYou must use an accurate scale (gram scale or triple beam balance scale) to weigh these components properly. Do not attempt to measure components by volume.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMixing tools and containers should be clean and dry. Mixing should be done in a well ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Combine \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e resin with the appropriate amount of hardener. Mix thoroughly for 3 minutes making sure that you scrape the bottom and sides of the container several times.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAdding Color\u003c\/strong\u003e\u003c\/em\u003e - \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e can be colored with \u003cstrong\u003eUVO™\u003c\/strong\u003e or \u003cstrong\u003eIGNITE™\u003c\/strong\u003e colorants or \u003cstrong\u003eCast Magic™ \u003c\/strong\u003eEffects Fillers. Pre-mix color or filler with Part A thoroughly and then add Part B.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMixing\u003c\/strong\u003e\u003c\/em\u003e – Be sure mixing utensils are clean and free of any potential contaminants such as dirt, dust or grease. Mix Parts A and B thoroughly for at least 3 minutes with a square edged mixing stick. Be aggressive and scrape sides and bottom of mixing container several times. Use the square edge of mixing stick to bring material off of the sides of container and blend. \u003cstrong\u003eIf using a drill mixer,\u003c\/strong\u003e follow with hand mixing as directed above to ensure thorough mixing.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAdding Fillers\u003c\/strong\u003e\u003c\/em\u003e - A variety of dry fillers can be added. Pre-mix dry filler with Part A before adding Part B.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eIncreasing Flexibility \u003c\/em\u003e-\u003c\/strong\u003e \u003cstrong\u003eFlexer™ Epoxy Flexibilizer\u003c\/strong\u003e is a clear, low viscosity liquid additive that will lower the durometer (Shore hardness) of some SmoothOn casting and laminating epoxies. When added to the epoxy system in the proper proportion, the cured epoxy will be softer and, in some cases, can be made semi-rigid. See the \u003cstrong\u003eFlexer™\u003c\/strong\u003e Technical Bulletin for more information.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e Mixed \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e is exothermic, meaning it generates heat. A concentrated mass of mixed epoxy in a confined area such as a mixing container can generate enough heat to melt a plastic cup, burn skin or ignite combustible materials if left to stand for its full Pot Life. Do not use foam or glass mixing containers or pour sections thicker than 3\/8 in. \/ 0.95 cm. If a batch of mixed epoxy begins to exotherm, move it to an open air environment.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePouring\u003c\/strong\u003e\u003c\/em\u003e – If casting \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e into a rubber mold, pour mixture in a single spot at the lowest point of the mold or enclosure. Let the mixture seek its level. A uniform flow will help minimize entrapped air. Recommended casting thickness maximum 3\/8 in. \/ 0.95 cm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLayer Pouring -\u003c\/strong\u003e When pouring \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e in layers, allow previous layer to fully cure and come to room temperature (73°F \/ 23°C) before pouring additional layers.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eCure Time:\u003c\/strong\u003e\u003c\/em\u003e Refer to specified \u003cstrong\u003eCure Times\u003c\/strong\u003e at room temperature depending on mass. Cured material will be hard and unable to penetrate with a finger nail. Cured epoxy can now be dry sanded. \u003cem\u003eIf machining or sanding, wear NIOSH approved mask to prevent inhalation of particles.\u003c\/em\u003e \u003cstrong\u003ePot Life and Cure Time values are dependent on mass and mold configuration, as epoxies are mass-sensitive.\u003c\/strong\u003e Let cure for 24 hours at room temperature. Castings that are ¼ in. thickness or less will cure more slowly and may require up to 48 hours to fully cure at room temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePerformance:\u003c\/strong\u003e\u003c\/em\u003e Cured castings are very hard 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 castings, wear dust mask or other apparatus to prevent inhalation of residual particles.\u003c\/p\u003e\n\u003cp\u003eCastings can be displayed outdoors after painting with an aliphatic urethane clear coat. Unpainted castings will yellow after being exposed to UV light or excessive heat above 115°F\/46°C. For longer outdoor UV resistance of an unpainted clear part, Smooth-On’s \u003cstrong\u003eCrystal Clear™\u003c\/strong\u003e Urethane Resin may be an option for your application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBecause no two applications are the same, a small test application to determine suitability is recommended if performance of this material is in question.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePainting\u003c\/strong\u003e\u003c\/em\u003e – Cured \u003cstrong\u003eEpoxAcast™ 690\u003c\/strong\u003e can be painted and \/ or primed and then painted with acrylic enamel paints. Let paint fully dry before putting part into service.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eRemoving Epoxy\u003c\/strong\u003e\u003c\/em\u003e – \u003cstrong\u003e\u003cem\u003eUncured \/ Non-curing epoxy\u003c\/em\u003e:\u003c\/strong\u003e Scrape as much material as possible from the surface using a scraper. Clean the residue with \u003cstrong\u003eE-POX-EE KLEENER™\u003c\/strong\u003e available from Smooth-On, lacquer thinner, acetone or alcohol. Follow safety warnings pertaining to solvents and provide adequate ventilation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ch3\u003eTechnical and Related Documents\u003c\/h3\u003e\n\u003cdiv\u003e\u003ca class=\"primary-trim\" href=\"https:\/\/www.smooth-on.com\/tb\/files\/EPOXACAST_690_692_TB.pdf\" target=\"_blank\"\u003eTechnical Bulletin\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003ca class=\"primary-trim\" href=\"https:\/\/www.smooth-on.com\/tb\/files\/CREATING_EPOXY_TABLES.pdf\" target=\"_blank\"\u003eCreating Epoxy Tables\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003eSafety Data Sheets\u003c\/h3\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ch3\u003e\u003ca href=\"https:\/\/www.smooth-on.com\/sds\/10004384-10004366.pdf\" target=\"_blank\"\u003eEpoxAcast 690 SDS \u003cspan class=\"sdslang\"\u003e| English\u003c\/span\u003e\u003c\/a\u003e\u003c\/h3\u003e\n\u003cspan class=\"sdselect\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.smooth-on.com\/msds\/files\/EpoxAcast_690.pdf\" target=\"_blank\"\u003e\u003c\/a\u003eFor Industrial Use Only. \u003cbr\u003eKeep Out of the Reach of Children. \u003cbr\u003e\u003cstrong\u003eWARNING: \u003c\/strong\u003eProp 65 Notice\u003c\/p\u003e","brand":"Smooth-On","offers":[{"title":"Trial Kit (2.6 lbs. \/ 1.18 kg.)","offer_id":48015605793083,"sku":"3642","price":49.99,"currency_code":"USD","in_stock":false},{"title":"Gallon Kit (10.4 lbs. \/ 4.72 kg.)","offer_id":48015605760315,"sku":"3661","price":150.99,"currency_code":"USD","in_stock":false},{"title":"5 Gallon Kit (45.5 lbs. \/ 20.64 kg.)","offer_id":48015605727547,"sku":"3671","price":534.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/EpoxAcast-690-combo-1400x1050.jpg?v=1748722932","url":"https:\/\/maacaffestore.com\/products\/epoxacast-690","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}