The Silver Institute
Silver in Industry
Silver in Brazing & Soldering

In the soldering and brazing of pipes, faucets, ducts and joints, silver provides safety, strength and quality unrivaled by any other material.

Brazing occurs when materials are joined at temperatures above 600 degrees Celsius while soldering is the term for when this happens at temperatures below 600 degrees Celsius. Adding silver to the process of soldering or brazing helps produce smooth, leak-tight and corrosion-resistant joints. Silver brazing alloys are used widely in everything from air-conditioning and refrigeration to electric power distribution. They are also important in the automobile and aerospace industries.

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.

Because of health concerns, the traditional 63% tin/37% 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, there is a worldwide movement toward using safer solder. Silver is and will continue to be a popular substitution for the metals that are currently being phased out.

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