FUSED SILICA MELTING CRUCIBLES FOR GOLD, SILVER and SCRAP ALLOY Set of 3 Crucibles- 1 of Each Size Clay bonded fused silica melting dishes to withstand temperatures up to 2800°F/1538°C. They have good thermal conductivity and will not contaminate metal alloys, chromium, gold or silver. Used by jewelers all over the world to melt gold, silver, brass, scrap alloy and other non-ferrous metal, propane, acetylene, or natural gas jewelers torches. All crucibles are equipped with pouring spout. This set includes 3 crucibles with the following sizes and capacities: Diameter Dimensions Capacity 1-1/2" 45mm 15mm 20 dwt/31 g 2-1/4" 60mm x 17mm 40 dwt/62 g 3" 77mm x 22mm 100 dwt/155 g IDEAL FOR MELTING SCRAP.