United
Precious Metal Refining, Inc.
Ag Casting Grain Type "95"
Sterling Silver "95" is a proprietary deoxidized sterling silver
designed to achieve maximum hardness and eliminate fire scale and
porosity. Sterling "95" has been developed to have a hardness
greater than standard sterling silver, while still retaining the
advantageous characteristics of our other sterling silver grains.
Jewelry made from this alloy has shown improved tarnish resistance.
Melting: Traditional methods of melting regular sterling silver
i.e. (as cool as possible) will cause a variety of problems. Most
failures with these sterling products are caused by too low of a
melt temperature. Customers familiar with silicon deoxidized silver
casting alloys should have less trouble adjusting to the performance
of this particular formulation.
MELTING
Temperature range 1020° - 1040° C / 1868° - 1904° F
REMELTING
We recommend a 50 % mix.
FLUXING
It is necessary to flux these silver melts. We recommend Boric
Acid/Borax mixture. Do not use Carbon Containing Fluxes or Charcoal.
Skim any surface oxides off the surface before stirring.
QUENCH TIME
20 - 25 minutes.
HARDNESS
This silver as cast will have a hardness similar to traditional
sterling silver AND HEAT It can be hardened further by heat
treatment at 300° C / 575° F for one hour, TREATMENT and air cool.
INVESTMENT REMOVAL
Most standard investment removers will successfully remove the
investment powder. The best solutions are the sulfuric and
hydrofluoric based products. UNITED’s Brite-Cast Investment Remover
also works well, although it is less aggressive and will take
longer.
FLASK
Use your regular flask temperatures + 50° F (Around 1200° F – 1250°
F). TEMPERATURE
FIRE SCALE
Fire scale is completely eliminated.
CYANIDE
Not recommended. TREATMENT
SOLDER
Soldering heat should be as low as possible to prevent low
temperature eutectic TREATMENT nodules from forming.
TECHNICAL ASSISTANCE
Always available…
Call 1-800-999-3463 / 1-800-999-FINE
E-mail / doc@unitedpmr.com
Web-Site / www.unitedpmr.com |