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Soldering flux has long been a cause of dermatitis where this material has spattered on the skin as the hot iron or torch is applied to the fluxed metal. The principal fluxes causing such dermatitis have been hydrochloric acid and stannic chloride, the action being that of a primary irritant. Both of these substances tend to corrode the metal parts on which they are used and research has been undertaken to find a flux which would act on the metal surface in such a manner as to permit the solder to adher but which would avoid the undesired corrosive action. Hydrazine hydrobromide and also the hydrochloride possess these attributes and already, according to TROYA~, they are being used for this purpose on a wide scale. Brass and copper are the metals with which this flux is chiefly used, but flux compositions are also being developed for use with aluminum. The hydrazine monohydrobromide does not dissociate in water (AuDaIET~ and OG(~) and accordingly can be used in aqueous solution, 2% being a usual concentration. The method of application varies widely with the materials being soldered, the extent of mass production of them and the ingenuity of the individual plant production engineer. In some plants the solution is applied automatically by means of a rotary brush; in others the solution is sprayed on the parts as they pass through an enclosure on a conveyor; in still others, the simple procedure of applying the flux solution by means of a hand brush is used. In the two former methods, exclosures are provided with exhaust ventilation as it was learned early in the introduction of this material that dermatitis occurred whenever the solution spattered on the skin of workers in the vicinity of the operation. After the hydrazine hydrobromide has been applied to the metal parts, soldering is done usually with torch or hot iron using soft solder in the form of wire or rod. Occasionally the parts may be dipped i~ a bath of molten solder.

Protection of workers against dermatitis on exposure to hydrazine hydrobromide soldering flux