• Professional grade soldering flux paste designed for use with copper, brass, tin, zinc and other common plumbing metals
• Formulated to clean and prepare pipe surfaces, ensuring strong reliable soldered joints in heating and water systems
• Suitable for use with both leaded and lead free solders, offering excellent wetting and flow characteristics
• Active flux provides rapid oxide removal and prevents re-oxidation during heating for clean, bright joints
• Non aggressive formula, easy to apply with a brush and water soluble for simple post-soldering cleanup
• Supplied in a large 475g trade size tub, ideal for professional plumbers and heating engineers

La-Co Regular Solder Flux, part LAC-22108, in a 475g trade tub. A professional grade flux paste for soldering copper, brass, tin, zinc and other common plumbing metals.

The flux cleans and prepares the metal surface, stripping oxide and stopping it reforming while the joint comes up to heat. That is what lets the solder wet the pipe properly and pull cleanly into the fitting, giving a bright, sound joint rather than a dry one. It works with both leaded and lead free solders.

The formula is non-aggressive and water soluble, so it brushes on easily and washes off afterwards. Flush pipework through after soldering to clear any residue, particularly on potable water systems. The 475g tub is a trade size, sized for daily use rather than a one-off repair.