Sterling silver Form:
Casting grain Metal color:
White Solidus temperature:
1,600-1,650°F Cast temperature:
5.37 (after casting) Country of origin:
Please choose your quantity below:
(Measurements above are in inches)
The term "conflict diamonds" refers to the diamond rough used to fund violent criminal insurgencies in several African countries.
The Kimberley Accord is a compact that regulates the sale and transfer of diamond rough to prevent the human destruction that conflict
diamonds cause. Rio Grande has long asked our suppliers to provide documentation proving the safe origin of the diamonds we buy.
You can be assured every diamond you buy from Rio Grande is certified “conflict-free” by both our strict standards and the Kimberley Accord.
Our Rio Graduate Gemologists are ready to help you match stones or select a specific quality. Please let them know how they can help you.
This sterling silver anti-firescale grain is a great choice for all types of casting, especially in creating components, sheet or tube that will be formed or connected using soldered joins. It incorporates select deoxidizing elements that prevent the castings from developing firescale when they’re annealed and soldered. Castings are clean and easy to finish. The sterling silver formulation is approximately 90% as hard as traditional sterling silver, and it can be used with acid-based plating solutions. 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.
Sold by the troy ounce (ozt.).
2013 Gems and Findings & Display and Packaging Catalog p.797
please note: • Do not use this grain with any cyanide-based plating solution. • For more information regarding the use or composition of this material, please refer to the reference sheet under the "More Info" tab. • 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.
How To Determine Metal Weight for Wax Trees
Knowing how to determine the correct metal weight for each wax tree before you cast ensures that you melt the right amount of metal for your cast, making your casting process more cost-effective and more reliable.
First, weigh your wax models along with main and gate sprues. Then add an additional 10% to account for your button.
Multiply that total by the specific gravity of the metal you're casting (see table above for a general guideline).
Example: For a 5-gram wax model, add 0.5 (10% of 5g) to get a total wax weight of 5.5g. For a 14KY gold casting, multiply 5.5g x 13.07 s.g. The amount of 14KY gold needed for this tree is 71.89 grams.
This deoxidizing sterling silver is designed to maintain maximum hardness while reducing firescale and porosity in your sterling silver castings. Please Note: Silicon carbide crucibles should not be used with silver alloys.
Casting: Temperature range is 980–1020°C or 1800–1870°F.
Re-Melting: A 50% fresh mix is recommended. Be sure no investment powder is left on your old silver; it will contaminate the mix.
Fluxing: It may be necessary to flux these silver melts. The most compatible flux for this casting grain and the alloys derived from it is boric acid. Skim oxides off the surface before stirring. Please Note: Do not use carbon-containing fluxes or charcoal. We also do not recommend using Matt's Flux because it is formulated with silicon dioxide, which defeats the silicon deoxidizer in the casting grain and causes heavy flux and oxide inclusions.
Quench Time: 15 minutes.
Hardness: This silver as-cast will have 90% of the hardness of traditional sterling silver. It can be hardened further by heat treatment at 600°F for two hours. 63 Rockwell "F".
Investment Removal: Most standard investment removers will work to remove the investment powder from this metal.
Flask Temperature: Use regular flask temperatures.
Firescale: Firescale is virtually eliminated.
Cyanide Treatment: Not recommended.
Annealing Sterling Silver
Learn how to anneal sterling silver, recovering metal that has become work-hardened and leaving the metal more workable.
Anneal the sterling silver between 1000°F and 1200°F (537°C and 648°C).
Heat the sterling at temperature for 30 to 60 minutes to achieve a Vickers hardness of 66–76dph.
Please Note: During annealing, protect the metal against exposure to oxygen by surrounding it with nitrogen, argon or forming gas. If this isn’t possible, protect the metal by covering it with flux contained in a stainless steel pan.
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