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 Sterling
silver is an alloy of silver containing 92.5% pure
silver and 7.5% other metals, usually copper. The
minimum millesimal fineness is 925.
Fine silver (99.9% pure) is generally too soft for
producing large functional objects, and in
Sterling the silver is usually alloyed with copper
to give strength whilst preserving the ductility
of the silver and a high precious metal content.
Other metals can replace the copper, usually with
the intent to improve various properties of the
basic sterling alloy such as reducing casting
porosity, eliminating firescale, and increasing
resistance to tarnish. These replacement metals
include germanium, zinc, platinum as well as a
variety of other additives including silicon and
boron. A number of alloys claiming firescale
and/or tarnish resistance have appeared in recent
years sparking heavy competition between the
various manufacturers and their different
formulations. No one alloy has emerged as an
industry leader or standard and ongoing alloy
development is a very active area. |
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