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Solder fluxes were at one time divided into two classifications: noncorrosive and corrosive. The noncorrosive fluxes generally were composed of different types of natural rosins, while the corrosive fluxes contained zinc chloride (ZnCl2), ammonium chloride (NH4Cl), and hydrochloric acid (HCl), either separately or in various combinations. This situation existed until the period between 1940 and 1950 when there developed a need for an essentially noncorrosive flux with better solder flowing characteristics than those obtainable with plain rosin.
Sohl, H. C.
Research Investigator, Federated Metals Division, Am. Smelting and Refining Co., South Plainfield, N. J.