This high-quality .925 sterling silver round shot casting grain ensures excellent results for silver jewelry applications and in virtually any casting method, producing a bright-white lustrous finished metal. "Sterling" is the term used to describe silver alloy that contains 92.5% silver and 7.5% copper; legally, 7.5% of any metal may be used, with the product still marked "sterling." The silver and copper that are used to produce the alloy are kept in an oxygen-reduced atmosphere during the melting and pouring process to ensure optimum deoxidation. Casting metal, because it comes ready to melt and pour into your mold, is fast and efficient to use and, because it is professionally produced, you can count on consistent, repeatable quality and composition over time. Applications: For virtually any casting method. Composition: We start with the best raw materials for our sterling silver grain. The copper used in alloying our sterling silver is 99.9% pure and oxygen-free. Each batch of casting grain is assayed to ensure product that contains 92.5% silver. Casting and Cleaning: Casting temperature should be at least 10 above the liquidus point (somewhat hotter if the castings are intricate). Use a small amount of high-quality flux when melting. For further cleaning, mechanical means are recommended. Re-Using: If you plan to re-use sterling silver castings, remove the copper oxides from the surface in a pickling solution and then tumble with burnishing compound to remove any remaining debris. We recommend a minimum 1:1 ratio of new grain to used silver. Sold by troy ounces (ozt Specifications: Specific gravity (g/cm3) : 10.36 Country of origin : United States Metal type : Sterling silver Karat/purity : 925 Form : Casting grain Metal color : White Solidus (melt) temperature : 1,490°F (810°C) Liquidus (flow) temperature : 1,639°F (893°C) Density : 10.36 ozt/cu in.