LA-CO Soldering Flux Paste is a water-soluble, non-acidic, non-toxic, and lead-free paste designed for plumbing and soldering applications. It meets industry standard ASTM B813 and is pH neutral, reducing corrosion concerns. The flux cleans pipe surfaces during application, allowing solder to flow smoothly. It is UK-WRAS approved for potable water and suitable for use on copper, brass, galvanized iron, lead, zinc, tin, silver, nickel, mild steel, terne plate, and malleable iron. It is not recommended for stainless steel or aluminium. For optimal results, clean all surfaces thoroughly before application, apply a thin layer of paste to the pipe ends without getting flux inside the pipes, heat the pipes to the correct temperature, and remove any excess flux with a damp cloth after soldering. This paste acts as a chemical cleaning agent to remove impurities from joint surfaces, ensuring a better joint and offering benefits of savings, safety, and certainty.