Superior Flux & Mfg. Co offers a long line of Industrial Flux and Electronic Flux that available from A to Z. Industrial Soldering Fluxes cover soldering operations that are non-electronic. (In contrast to Industrial Soldering Flux, Electronic Soldering Flux is used in printed circuit board (PCB) assembly and repair, and component lead tinning.) Soldering is a process whereby similar or dissimilar metals are joined using an alloy that typically includes a base of tin combined with lead, silver, copper, antimony, bismuth or indium. Soldering covers a temperature range of 140 – 850°F / 60-445°C.