Well thermal stability : according to the using conditions of graphite crucible snap heat and cold. Well corrosion , impact performance, to the reliability of product quality; Well to strong acid, strong alkali. Good heat transfer performance of graphite crucible: for greatly shorten the melting time and save energy. Ash content less than 0.1% , to the precious metals in smelting is not contaminated. In high-temperature using process, it got small thermal expansion coefficient; And certain strain to the thermal shock, quenching; Long service life. Color: Black Size: 40*30mm Hole diameter: 20mm Material: graphite Bulk density greater than equal 1.78 g/cm3 Electric resistivity greater than equal 9 Ohm m Bending strength greater than equal 40 Mpa resist compression greater than equal 70 Mpa particle less than equal 43um Has good thermal conductivity and temperature , melting gold, silver, and other precious metals and other alloys with high purity graphite crucible, product high temperature , anti-oxidation corrosion and long service life. Utilization: Graphite crucible is generally used in alloy tool steel smelting and smelting of nonferrous metals and their alloys. Graphite crucible can be used in the processing of graphite, graphite crucible, graphite casting crucible tank,pull rods, mold and other graphite products. Graphite crucible let the products are more durable than ordinary material products,longer service life, able to withstand more than 2000 Celsius high temperature Using Tips: Stored in dry place, do not get it wet after drying the crucible , don't make it touch with water. Be careful not to give a mechanical impact force, not from a fall or impact. Package Included: 1 x Pure Graphite Crucible Cup Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.