... for melting glass/platinum/aluminum/goldModel DescriptionG-391 50 ml Ceramic Crucible, 61 x 37 mm*G-392 100 ml ... x 52 mm*G-394 250 ml Ceramic Crucible, 102 x 60 mm* Corundum ceramic crucible series: Be applicable to a variety ... , precious metals, and roasting high, medium and low ceramic capacitors, NTC, PTC piezoelectric ceramic and lithium cobalt oxide, lithium manganese oxide powder! Professional ...