Stainless Steel Soldering Flux – 1 Pint Bottle | Industrial-Grade Acid Flux for Steel, Brass, Nickel & Hard-to-Solder Metals | Fast Acting, Strong Bond, Made in USA

Rubyfluid Stainless Steel Soldering Flux – Engineered for Hard-to-Bond Metals Tackle the toughest soldering jobs with Rubyfluid Stainless Steel Soldering Flux, purpose-built for stainless steel, nickel, and other challenging metals. This industrial-strength acid flux is trusted by professionals in HVAC, metalworking, manufacturing, and precision fabrication for its ability to break through oxidation and promote strong, durable solder joints—even on the most stubborn surfaces. Unlike general-purpose fluxes, Rubyfluid’s stainless steel formula is optimized for high-temperature performance, rapid wetting, and superior bonding strength. Use it on fittings, sheet metal, appliances, or assemblies where clean, lasting joins are critical. Proudly made in the USA since 1903, Rubyfluid continues to set the standard in specialty soldering fluxes. Available in a convenient 1-pint size for efficient shop use. Contains Zinc Chloride and Hydrochloric Acid, not for electronics use.

• Designed for Stainless Steel & Tough Metals – Specially formulated for stainless steel, nickel, brass, and other hard-to-solder surfaces where general fluxes fail.
• Strong, Reliable Solder Joints – Promotes rapid wetting and uniform flow to ensure high-strength, corrosion-resistant connections in demanding environments.
• Industrial-Grade Acid Flux – Powerful acid-based formula for professional applications; ideal for fabrication, repair, HVAC, and metalworking shops.
• Made in the USA Since 1903 – Trusted for over a century, Rubyfluid’s fluxes deliver consistent results for tradespeople and manufacturers alike.
• 1 Pint Value Bottle – Durable, resealable container for extended use; perfect size for shop floors, toolkits, and heavy-duty projects.