HASCLF4 - Harris Stay-Clean Liquid Soldering Flux - 4 oz Bottle

Harris Stay-Clean Liquid Flux for Industrial Soldering Applications

The Harris Stay-Clean Liquid Flux (SCLF4) is a premium, general-purpose zinc chloride flux engineered for professional soft soldering applications. Designed to meet the rigorous demands of industrial maintenance, HVAC fabrication, and metal repair, this highly active flux ensures superior bonding on a wide range of base metals. Unlike milder rosin-based fluxes, Stay-Clean aggressively removes surface oxides and prevents re-oxidation during the heating process, creating a chemically clean surface that promotes optimal wetting and capillary action.

This liquid flux is particularly renowned for its effectiveness on metals that are traditionally difficult to solder. It performs exceptionally well on stainless steel, chrome-plated brass, and galvanized iron, as well as standard materials like copper, brass, bronze, lead, zinc, nickel, and silver. Its fluid consistency allows it to penetrate deep into lap joints and seams, ensuring a void-free connection that is critical for leak-proof plumbing and structural integrity in sheet metal work.

Technical Specifications & Usage:

• Composition: Zinc chloride based inorganic acid flux.


• Compatibility: Use with all standard soft solders, including tin-lead, tin-silver, and lead-free alloys.


• Application Method: Can be applied with a brush, swab, or by dipping the part.


• Post-Solder Cleaning: Because Stay-Clean is an acid flux, the remaining residue is corrosive. It is essential to remove all flux residues after soldering using hot water or a neutralizing mild alkaline solution to prevent long-term corrosion of the workpiece.

Industrial Suitability:

Harris Stay-Clean is a staple in radiator repair shops, plumbing service trucks, and general fabrication facilities. It is the preferred choice when a strong, reliable bond is required on dissimilar metals or oxidized surfaces that milder fluxes cannot handle. Please note that this product is not suitable for aluminum, magnesium, or titanium, and it must never be used for electrical or electronic soldering applications due to its conductive and corrosive nature.