Achieve a smooth and reliable solder connection with LA-CO Soldering Flux Paste. This water-soluble paste is ideal for both water and gas applications, ensuring no residue is left behind in water piping. Its non-acidic, non-toxic, and lead-free formula is pH neutral and meets ASTM B813 standards, containing no zinc chloride to prevent corrosion. The flux cleans pipes upon application, allowing solder to run more smoothly for a superior finish. UK-WRAS approved for potable water use. Suitable for copper, brass, galvanised iron, lead, zinc, tin, silver, nickel, mild steel, terne plate, and malleable iron. Not recommended for stainless steel or aluminium. Key Features: * Water-soluble for residue-free application * Non-acidic, non-toxic, and lead-free * pH Neutral and ASTM B813 compliant * Reduces corrosion concerns * Cleans pipes for smoother solder flow * UK-WRAS approved for potable water Product Summary: LA-CO Soldering Flux Paste, 125g, Steel, water-soluble, non-acidic, non-toxic, lead-free, pH neutral, corrosion-reducing, UK-WRAS approved, suitable for various metals including copper, brass, iron, and steel.