Product specifications:  1.Made of fire clay  2.Used for smelting & assaying  3.High density & quality   Applications: Precious metal analysis Mining laboratory Laboratory testing Mineral assaying Fire assaying  Gold assaying   Features: Long lasting, can be used 3-5 times  High mechanical strength designed to withstand severe thermal shocks Special formula, curing and pressing process Multi-use crucible Withstand extremely corrosive fire assay environments   Packaging & shipping: Cartons with pallete, crates or as customer's requiements.   Usage: Used for smelting and assaying , excluding gold and silver elements, more accurate test results, high temperature resistance and resistance to thermal shock . The average serial can be used for 3-5 times Specific technical data Production method:press forming Typical chemical analysis Sio269.84% Al2o328% Cao 0.14% Fe2o31.90% Working temperature1400??-1500?? Specific gravity:2.3 Porosity: 25%-26%