Solder Wire UNIPAK Unipak Lut miękki nr3-SN97 Cu3 Ø2mm 250g

Soft solder wire UNIPAK Unipak Lut miękki nr3-SN97 Cu3 Ø2mm 250g is a lead-free tin-copper alloy solder designed for general-purpose soldering of electrical and electronic components, joints and metal parts. With a composition of Sn97/Cu3 and a 2 mm diameter on a 250 g spool, this solder provides a consistent filler material suitable for repair, assembly and maintenance tasks in workshops and electronics labs.

Advantages

The Sn97/Cu3 composition offers a lead-free alternative with reliable wetting and mechanical strength for typical electronics and metal-joining applications. The 2 mm diameter wire ensures steady feed and controlled melting for hand soldering and small-scale assembly. Packaged on a 250 g spool, it is convenient for repeated use and storage while reducing the need for frequent replacements.

Suitable for

• Soldering electrical wiring and terminals
• Joining metal parts and components in repair work
• Assembly and rework of electronic boards where a tin-copper alloy is acceptable
• General maintenance tasks in workshops and labs

Key specifications

• Alloy composition: tin 97% / copper 3%
• Diameter: 2 mm
• Spool weight: 250 g
• Form: solid wire
• Suitable for lead-free applications

How to use

Prepare the surfaces by cleaning off oxidation, grease and contaminants to ensure good wetting. Heat the joint with an appropriate soldering iron or soldering station until the base metals reach soldering temperature, then apply the solder wire to the heated area, allowing it to flow and form a fillet. Avoid excessive heating time to prevent damage to components; use flux if required by the application to improve flow and adhesion. Allow the joint to cool undisturbed to form a solid connection.

Usage recommendations

Use appropriate personal protective equipment and work in a well-ventilated area. Choose a soldering iron tip and temperature matched to the 2 mm wire and the materials being joined; for typical electronics tasks, moderate tip sizes and controlled temperatures reduce thermal stress. Store the spool in a dry place to prevent surface contamination and ensure consistent soldering performance.