Features: Excellent thermal conductivity and corrosion resistance. Better for Refining than Silicon Carbide 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 for-time and save energy; Great resistance to ensure the reliability of product quality. Application:Used for melting and casting metals .such as Gold, Silver, Brass, Aluminum, Copper, Plumbum, etc. Warm-Tips:Pure crucible can NOT be heating by carbon furnace or charcoal kiln.It will be-oxidized and cracked; Pure 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 for Furnace. Specifications: Size:As the Picture Show Note: Please allow 1-2cm errors due to manual measurement,Please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Casting Melting Ingot