Silver Bullion - Brazing and
Soldering
Silver facilitates the joining of materials - called
brazing when done at temperatures above 600 degrees Celsius and soldering when below - and produces naturally
smooth, leak-tight and corrosion-resistant joints. Silver brazing alloys are used widely in applications ranging
from air-conditioning and refrigeration to electric power distribution. It is also used in the automobile and
aerospace industries.
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Silver brazes and solders combine high tensile
strength, ductility and thermal conductivity. Silver-tin solders are used for bonding copper pipe in homes,
where they not only eliminate the use of harmful lead-based solders, but also provide the piping with silver’s
natural antibacterial action. Major faucet manufacturers also use silver-based bonding materials to incorporate
these advantages. Refrigerator manufacturers use silver-based bonding materials to provide the ductility
required for constant changes in temperature of the cooling tubes.
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Because of health concerns, the traditional 63 percent tin/37
percent lead solder used to build electronic equipment is quickly being replaced by a combination of silver, tin and copper solder. The movement was
boosted by the Restriction of Hazardous Substances (RoHS) legislation that applies throughout the European Union
(EU). The law bans all products containing more than a trace amount of lead, mercury, cadmium and several other
hazardous substances. Although the laws apply only to EU countries, it is being felt worldwide as companies move
to a safer solder.
Source: The Silver Institute
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