Superior No. 30 is a liquid flux that is ideal for soldering copper or brass. No. 30 is safer to use than the typical inorganic acid soldering flux. No. 30 is mild enough to use with electronic and electrical components. All post-solder residues are water-soluble and must be cleaned off with 60°C/140°F water to avoid cleanliness failures. No. 30 is typically used with a soldering iron or hot plate, and is not formulated for use with a torch.
Superior No. 75 is an inorganic acid general purpose soldering flux that can be used to solder badly oxidized copper or brass. No. 75 contains Zinc Chloride and can be soldered with a torch, in addition to a soldering iron or hot plate. As No. 75 does contain Zinc Chloride, it should not be used with electronic components, as Zinc residues can be detrimental to electronic components. All post-solder residues are water-soluble and should be cleaned off with 60°/140°F water.
No. 130 is a petroleum-based soldering flux that contains Zinc Chloride and Ammonium Chloride. No. 130 is ideal for torch soldering of copper pipes and other copper and brass parts. As No. 130 does contain Zinc Chloride, it should not be used with electronic components, as Zinc residues can be detrimental to electronic components.
Superior No. 135 is a rosin/petrolatum soldering flux paste ideal for use with copper. The petrolatum helps protect the solder joint against attack, and the rosin leaves a protective coating over the solder area after soldering. No. 135 is ideal for soldering electronic or electrical components. Soldering should be done with a soldering iron or a hot plate, but not with a torch.