LA-CO Soldering Flux Paste - 125g
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Product Information
Full details
The LA-CO Soldering Flux Paste is an essential tool for professional plumbers and contractors working on gas or water piping systems, offering a reliable, lead-free solution for achieving high-quality solder bonds. It excels at pre-cleaning surfaces to ensure smooth solder flow and is fully WRAS-approved for potable water safety; however, it is important to note that this formula is not compatible with aluminum or stainless steel surfaces.
All features
| Model Part Number | 50020210 |
|---|---|
| Brand | La-co |
Extended Product Information
FAQs
Is this flux safe for drinking water pipes?
Yes, this product is UK-WRAS approved, making it safe for use in potable water systems.
Can I use this on stainless steel?
No, LA-CO Soldering Flux Paste is not formulated for use on stainless steel or aluminum surfaces.
Does this flux contain zinc chloride?
No, it is a non-acid, zinc chloride-free formula designed to minimize corrosion risks.
How do I remove the flux after soldering?
Because it is water-soluble, simply wipe the area with a damp cloth after the joint has cooled.
What metals is this compatible with?
It is suitable for copper, brass, galvanized iron, lead, zinc, tin, silver, nickel, mild steel, and malleable iron.
Troubleshooting
Solder is not flowing into the joint
Ensure the pipe and fitting have been cleaned with an abrasive pad and that enough heat is being applied to melt the solder upon contact.
Joint shows signs of corrosion after time
Verify that you did not use the flux on incompatible metals like aluminum, and ensure all flux residue was washed away post-installation.
Pros and Cons
Pros
- Safe for use with potable water systems
- Non-toxic and lead-free formulation
- Easy to clean up with water after application
- Prevents internal pipe corrosion by excluding zinc chloride
- Excellent flow characteristics for consistent joints
Cons
- Not suitable for stainless steel projects
- Cannot be used on aluminum components
- Requires proper storage to prevent contamination
Setup, Compatibility & Care
To ensure a successful bond, always prepare your metal surfaces by sanding or wire-brushing them until bright. Apply the flux paste immediately before assembly to prevent re-oxidation. Store the container in a cool, dry place with the lid tightly secured to maintain the paste's consistency and prevent moisture contamination. This flux is designed to work with most common plumbing metals including copper, brass, galvanized iron, lead, tin, silver, nickel, and malleable iron. Do not attempt to use this product on stainless steel or aluminum, as the chemical properties will not achieve an effective bond and may cause damage to the material.