Sterling Silver by Stuller
The Look of Platinum. The Strength of Gold.
After more than 42 years in the jewelry business, Stuller’s extensive experience with precious metals has given us in-depth knowledge about their characteristics. That knowledge makes us better equipped to expand on those characteristics and develop new metal alloys, to minimize the limitations and maximize their ideal qualities – all to help you make better and longer-lasting heirloom-quality jewelry for your customers. Whatever your needs, be it findings, shanks, or mill products, Stuller has your white hot metal desires covered. For more information, call 800-877-7777.
Developed by Stuller, Continuum™ sterling silver has over 95% precious metal content. It is considered a European-friendly sterling silver, as it contains no nickel. It is a grade 1 bright white metal. This patent-pending sterling silver has an as-cast hardness that allows setting of high quality stones in a sterling silver jewelry. This, combined with superior oxidizing and tarnish resistance, allows for a finish that will last longer.
It can easily be age hardened up to 150 HV, making it comparable to the “as-cast” hardness of 14kt gold. It remains ductile after hardening and can be used to make high quality earring clutch backs and other jewelry components that require springiness. Continuum’s mechanical properties fall between those of 14kt yellow gold and most other sterling silver alloys. This versatile alloy can be used for casting, die striking, and producing mill products. It can be worked at the bench with ease.
- Color: Grade 1 white
- Density: 10.42 g/cc
- Melt Range: 1680°F – 1730°F/916°C - 945°C
- As Cast Hardness: 97 HV - 117 HV
(more than 1/3 harder than regular sterling silver)
- Annealed Hardness: 75 HV
- Age Hardened: 150 HV
- Ultimate Tensile Strength: 35,000 psi
- Yield Strength: 17,000 psi
- Elongation after annealing: 35%
- Elongation after age-hardening: 30%
Continuum sterling silver can be age hardened in one of two ways.
(1) Two step age hardening
- 725°C to 790°C (1330°F to 1450°F) for 15 to 30 minutes followed by immediate quench in water.
- 428°C (800°F) for 15 to 30 minutes followed by either air cool or water quench.
(2) Single step age hardening
Note: Single step hardening works only when the cast piece has been rapidly quenched in water soon after button has become solid.
- 428° C (800°F) for 15-30 minutes followed by either air cool or water quench.
- 725°C to 790°C (1330°F to 1450°F) for 15 minutes, or temp is systemically stable followed by immediate quench in water.
Cold Working Considerations:
- Can be worked much like typical sterling silver.
- Maximum recommended total reduction during cold working is 60%.
Investment Casting Mold Tempatures and Recommendations:
Similar to that of any other sterling silver. Typical calcium sulfate (gypsum) bonded investment can be used.
Approximate Flask Temperatures (Range/Guideline):
|Filigree||1150 – 1200°F||620 – 650°C|
|Light||1100 – 1150°F||595 – 620°C|
|Medium||900 – 1000°F||480 – 535°C|
|Heavy||850 – 925°F||455 – 500°C|
Approximate Casting Temperatures
We recommend a superheat of 100°F to 150°F above the melting point of the alloy. Therefore the set temperature point in your casting machine should be:
Can be enameled by traditional high temperature fired enamel
When melting in casting equipment we recommend that an inert gas, such as argon, be used as a protective cover.
For the Bench Jeweler:
- Can be fused without using solder.
- Wire can be balled with a torch.
- Sheet can be reticulated.