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This is a silicon carbide graphite crucible. Furnace(Link:https://www.amazon.com/dp/B08DHH3ZP9. It can also be used in other Fuel Furnaces, Natural gas Furnaces, Coke Ovens, Coal Stoves, etc. 【Material】Silicon Carbide Graphite 【Chemical Composition】 C: 45% SiC: 23% Al2O3: 26% SiO2: 6% 【Durable】2-5 Times Longer Life than Clay Crucible 【Quality】Withstand Temperatures up to 1800℃(3272℉),Higher than Clay Graphite Crucibles 【Application】MeltingGold,Sliver,Copper,Brass,Aluminum and More 【Outer Size】100mm Diameter * 103mm Height(3.9" Diameter * 4.1" Height) 【Inner Size】80mm Diameter * 95mm(3.2" Diameter * 3.74" Height) 【Apparent Porosity】≥8.55Mpa