Forney 4 oz Acid Core Wire Solder, with a 0.13 inch diameter and a tin/lead 40/60 alloy, is built for dependable, heavy-duty soldering where strong wetting and fast flow matter. Packaged in a compact 4 oz spool, this leaded solder delivers robust joints for copper, metal fabrication, and everyday repair tasks that demand reliable conductivity and solid mechanical strength.
What makes this solder stand out
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Acid-core flux integrated in the wire: The core flux actively cleans metal surfaces as you solder, helping to break through oxidation on copper and other metals for a solid, consistent bond.
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40/60 tin/lead alloy: This classic balance provides steady flow and dependable wetting across a range of temperatures, delivering smooth joints with good strength and ductility.
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0.13 inch wire diameter: A sturdy gauge that’s well-suited for thicker connections and metalworking projects where you need more depositing power per pass.
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4 oz spool: A practical, ready-to-use quantity that keeps you productive on longer projects without constant reloading.
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Lead-containing solder: This product uses leaded solder, which offers reliable wetting and lower melting temperatures than many lead-free formulations—use with appropriate safety and disposal considerations.
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Versatile for metalwork and repairs: Ideal for copper pipe work, sheet metal, brackets, and other metal-to-metal joints where aggressive flux and strong adhesion are beneficial.
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Residue considerations: Acid flux residues are corrosive if left on the joint—plan to clean the area after soldering to prevent corrosion and ensure long-term durability.
Ideal use cases
- Copper pipe repairs and metal plumbing tasks where aggressive flux helps ensure a reliable seal.
- Sheet metal fabrication and light structural joints that require strong bonding and steady flow.
- General metal soldering jobs on fixtures, brackets, and hardware where a leaded solder is preferred for predictable performance.
Practical tips for best results
- Prepare surfaces by cleaning oxides and contaminants to maximize flux efficiency and joint integrity.
- Feed the solder into the joint, not directly onto the iron tip, and maintain a steady, controlled heat to avoid overheating.
- Even with flux inside, wipe away excess residue after cooling and rinse as needed to neutralize acidic flux.
- Store in a cool, dry place away from moisture to maintain solder consistency and shelf life.
- Handle with care—this is leaded solder; follow local safety and disposal guidelines for lead-containing materials.
Why choose Forney for your soldering projects
Forney has a long-standing reputation for reliable, workhorse tools that professionals and hobbyists can trust. This 4 oz acid-core solder brings together proven leaded performance with practical packaging, making it a dependable choice for metalwork, repairs, and fabrication tasks where proven wetting and strong bonds are essential.
