99.95% Graphite, Ash content less than 0.1%.Excellent thermal conductivity and corrosion resistance.Better for Refining than Silicon Carbide Graphite Crucibles.[Perfect Performance] Excellent thermal stability for fast heating and cooling; Well corrosion resistance to strong acid and alkali; Good thermal conductivity properties which highly shorten the melting time and save energy; Great impact resistance performance to ensure the reliability of product quality.[Application]Used for melting and casting metals. such as Gold, Silver, Brass, Aluminum, Copper, Zinc, Plumbum, etcSpecifications:Ash less than or equal to 0.1%Bulk density greater or equal to 1.82 g/cm3(1 troy ounce =31.1035g)Outer size:100 x 30 x 30mm/ 4 x 1.2 x 1.2 inchInner size: 90 x 20 x 20mm/ 3.5 x 0.8 x 0.8inch (1.18 fl oz)Capacity: 650g gold / 300g silverColour: BlackMaterial: graphitePackage Contents:1 x Graphite Casting Melting Ingot[Warm-Tips]Pure graphite crucible can NOT be heating by carbon furnace or charcoal kiln.It will be oxidized and cracked; Pure graphite will start to oxidize at 752 F (400).The withstand temperatures can be 3200 F if you use Air Electric Furnace.The withstand temperatures can be 5000 F if you use Vacuum or Gas Protection Furnace.Only the above package content, other products are not included.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.