Expertly melt and assay precious metals with our 100 Gram Ceramic Alumina Crucibles. Perfect for jewelers, it's designed for melting gold, silver, and copper alloys. With high heat resistance and durability, this crucible is a must-have for any serious jeweler, refiner or hobbyist. This set of six ceramic crucible melt dishes is perfect for those in the jewelry and metals industry. Made of high-quality ceramic and alumina, these dishes are suitable for casting and assaying gold, silver, and copper. The dishes are white in color and are branded as PresidentGolds. The dishes are great tools for anyone looking to create or repair jewelry. They are a must-have for those who work with precious metals and want to ensure the best quality for their customers. With this set, you can easily melt and pour your metals without worrying about the condition of the dish. Trust in the quality and durability of PresidentGolds and order your set today! Uses: Before melting the gold and silver, borax should be placed at the bottom of the bowl to prevent the gold and silver from sticking to the bottom of the bowl after melting. The melting bowl is easy to absorb moisture, preheat and gradually heat before use to prevent the water from freezing and bursting Material Specifications: Alumina (Al2O3) Crucibles Melting point – 2,072 °CRecommended Max working temperature – 1,600 °CMax ramp rate - 5 °C/min 1200 °CMax cooling rate - 2 °C/minAvoid Thermal gradients Note: 100 Gram(s) refers to gold weight.