This high-quality .925 sterling silver casting grain ensures excellent results for silver jewelry applications and in virtually any casting method, producing a bright white 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.
Process: Rio Grande experts take every precaution to ensure our silver casting grain is oxygen-free. The metal is continually kept in an oxygen-reduced atmosphere during the melting and pouring process to ensure optimum deoxidation. We have an entire division devoted to producing the finest casting grain available.
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. We recommend Matt’s Casting Flux™ (see riogrande.com or your Tools & Equipment catalog). 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. A minimum 50/50 ratio of new grain to used silver is recommended.
Sold by troy ounces (ozt.).
Solidus Temp.: 1,655
Density (after casting): 5.46 (ozt./cubic inch)
Form: Round shot casting grain
Color: Brilliant white luster
• Due to the manufacturing process of casting grain, the grain is irregular in shape and size.
• For more information regarding the use or composition of this material, please refer to the reference sheet provided below.
• IMPORTANT: Sterling silver is an alloy containing metals that react with chemicals found in air and produce tarnish; high moisture levels, exposure to sunlight and contaminants such as salt water increase this reaction. Take steps to protect your sterling silver by keeping it in airtight packages, use tarnish-resistant products (such as tarnish tabs or strips) that absorb harmful chemicals, and store metals in a cool, dry place. Most tarnish is easily removed by polishing with a mild abrasive or soaking in an anti-tarnish solution.