UNIPAK Solder Paste LF Nr. 3 S Sn97Cu3

UNIPAK Solder Paste LF Nr. 3 S Sn97Cu3 is a professional-grade, lead-free soldering paste specifically engineered for plumbing and heating installations. This high-quality flux-based compound is designed to facilitate the capillary soldering of copper pipes and fittings, ensuring consistent and reliable results. By promoting optimal wetting of the metal surfaces, it helps create strong, durable, and corrosion-resistant joints that meet the rigorous demands of modern piping systems.

Advantages

The primary benefit of using UNIPAK Solder Paste LF Nr. 3 S is its superior formulation which guarantees excellent flow and adhesion during the soldering process. Because it is lead-free, it is a safer and more environmentally conscious choice for potable water systems. The paste effectively removes oxides from the metal surface, allowing the solder to bond perfectly, which minimizes the risk of leaks and ensures the long-term integrity of the installation. Its consistency allows for easy application, reducing waste and improving efficiency on the job site.

Suitable for

• Soldering copper pipes and fittings in plumbing systems
• Heating and central heating installations
• Capillary soldering applications
• Professional HVAC piping work

When it may not be suitable

This product is specifically formulated for copper-to-copper soldering and may not be suitable for joining dissimilar metals or materials other than copper. It is not intended for use in electronic soldering or high-precision circuit board assembly where specialized fluxes are required.

Key specifications

• Composition: Sn97Cu3 (Tin-Copper alloy)
• Type: Lead-free soldering paste
• Application: Capillary soldering
• Compatibility: Copper pipes and fittings

How to use

Before application, ensure that the surfaces to be joined are clean, dry, and free of grease or oxidation. Apply a thin, even layer of the UNIPAK Solder Paste LF Nr. 3 S to the end of the pipe and the inside of the fitting. Assemble the joint and heat the connection evenly using a suitable heat source. Once the target temperature is reached, apply the solder wire to the joint, allowing the molten metal to be drawn into the capillary gap by the flux. Allow the joint to cool naturally without disturbance to ensure a solid connection.

What to consider before purchase

• Verify that the piping material is compatible with Sn97Cu3 alloy
• Ensure you have the appropriate heating equipment for copper soldering
• Check local regulations regarding lead-free requirements for plumbing

Usage recommendations

Always clean the soldered joint thoroughly after the process to remove any residual flux, as this helps prevent long-term corrosion and ensures a professional finish. Work in a well-ventilated area to avoid inhaling fumes during the heating process.