{"product_id":"graphite-crucible-3kg-high-purity-graphite-crucible-melting-gold-silver-copper-furnace-casting-mold-melt-jewelry-tools","title":"Graphite Crucible, 3kg High Purity Graphite Crucible, Melting Gold, Silver, Copper, Furnace Casting Mold Melt Jewelry Tools","description":"\u003ch1\u003e3 kg High-Purity Graphite Crucible for Electric Melting Furnaces\u003c\/h1\u003e\n\u003cp\u003eMelt and pour gold, silver, copper and other compatible nonferrous metals with this high-purity graphite crucible. Its tall cylindrical body is designed to fit compatible electric melting furnaces, while the molded pouring groove helps direct molten metal into an ingot mold or casting flask.\u003c\/p\u003e\n\u003cp\u003eGraphite provides fast, even heat transfer and good resistance to thermal cycling when the crucible is heated, handled and stored correctly.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eNominal 3 kg crucible size\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-purity graphite construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for compatible electric melting furnaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for gold, silver, copper and compatible alloys\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEfficient thermal conductivity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLow thermal expansion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMolded pouring groove\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTall cylindrical furnace-crucible design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for refining, jewelry work and small foundry projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSmooth interior helps reduce retained metal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReusable with proper care\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eProduct type: Furnace melting crucible\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNominal size designation: 3 kg\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaterial: High-purity graphite\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOverall height: Approximately 170 mm \/ 6.69″\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTop outside diameter: Approximately 75 mm \/ 2.95″\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBottom outside diameter: Approximately 60 mm \/ 2.36″\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInside diameter: Approximately 50 mm \/ 1.97″\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eApproximate inside depth: 150 mm \/ 5.91″\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaximum stated operating temperature: Approximately 1300°C \/ 2372°F\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFurnace compatibility: Properly sized electric melting furnaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePouring feature: Molded pouring groove\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eColor: Graphite black\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMeasurements are approximate. Confirm your furnace chamber, lifting-tong and pouring-tong dimensions before ordering.\u003c\/p\u003e\n\u003ch2\u003eMetal Compatibility\u003c\/h2\u003e\n\u003cp\u003eSuitable for melting compatible nonferrous metals and alloys, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eGold\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSilver\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCopper\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBrass\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAluminum\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLead\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecious-metal jewelry alloys\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompatibility depends on operating temperature, alloy composition, flux selection and furnace design.\u003c\/p\u003e\n\u003ch2\u003eUnderstanding the 3 kg Rating\u003c\/h2\u003e\n\u003cp\u003eThe “3 kg” description identifies the crucible’s nominal commercial size. It does not mean the crucible will safely hold exactly three kilograms of every metal.\u003c\/p\u003e\n\u003cp\u003eGold, silver, copper and aluminum have very different densities. Actual working capacity also depends on the alloy, required headspace, furnace limitations and safe pouring practices.\u003c\/p\u003e\n\u003cp\u003eDo not fill the crucible to the rim. Always leave adequate headspace to reduce the risk of spills and molten-metal overflow.\u003c\/p\u003e\n\u003ch2\u003ePackage Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOne 3 kg-size high-purity graphite crucible\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eElectric furnace, furnace tongs, pouring tongs, flux, ingot molds, casting tools, protective equipment and metal are not included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eIdeal For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eGold and silver melting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecious-metal refining\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eJewelry casting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCopper and brass projects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePouring small ingots\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLaboratory and workshop metalwork\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReplacing a worn electric-furnace crucible\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFurnace Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis crucible is intended for a compatible electric melting furnace with sufficient chamber height and diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIt is not recommended for direct torch heating, open-flame furnaces, charcoal kilns or carbon-fired furnaces. Direct flame exposure can accelerate oxidation, create uneven heating and cause premature cracking.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDo not assume compatibility based only on the furnace’s advertised kilogram rating. Compare the crucible’s complete external dimensions with the furnace chamber and lifting system.\u003c\/p\u003e\n\u003ch2\u003eSafe Use and Care\u003c\/h2\u003e\n\u003cp\u003eGraphite crucibles are durable but can crack from moisture, impact, oxidation or sudden temperature changes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eInspect the crucible before every melt.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDo not use it if cracked, deeply eroded or structurally damaged.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKeep the crucible completely dry.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStore it away from moisture and corrosive chemicals.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePreheat gradually according to the furnace manufacturer’s instructions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNever place wet metal, damp flux or contaminated scrap into a hot crucible.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUse properly fitted lifting and pouring tongs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAvoid striking or dropping the crucible.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDo not cool a hot crucible with water.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAllow it to cool naturally in a protected, dry location.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUse appropriate face, eye, hand, body and foot protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eImportant Safety Notice\u003c\/h2\u003e\n\u003cp\u003eMolten-metal work can cause severe burns, fire, toxic exposure and property damage. Operate the furnace only in a properly ventilated, fire-resistant workspace and follow the furnace, flux and alloy manufacturers’ instructions.\u003c\/p\u003e\n\u003cp\u003eNever introduce sealed, hollow, wet, plated or unidentified material into molten metal. Moisture can expand explosively when exposed to molten metal.\u003c\/p\u003e","brand":"High Plains Prospectors","offers":[{"title":"Default Title","offer_id":48283652948186,"sku":"CRU3KG","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1639\/4333\/files\/41UR-UmAsNL._AC_SL1024.jpg?v=1785441428","url":"https:\/\/www.highplainsprospectors.com\/products\/graphite-crucible-3kg-high-purity-graphite-crucible-melting-gold-silver-copper-furnace-casting-mold-melt-jewelry-tools","provider":"High Plains Prospectors","version":"1.0","type":"link"}