We are offering Tungsten Crucible.grade:w1appearance:silver grayapplication:mainly used for smelting of rare earth metals, heating elements of induction furnace, heating elements of smelting of quartz glass, sapphire crystal growing furnace. specification tolerance densitydia.(80-600)mm*(80-850)mm +/-0.5mm >18.0g/ccnote:we can supply products according to customer's drawing.