Solder wire UNIPAK Lut miękki S-Sn97Cu3 2.5 mm 100 g - 4514230

UNIPAK soft solder wire S-Sn97Cu3 is a lead-free solder composed of 97% tin and 3% copper, supplied on a single 100 g spool with a 2.5 mm diameter. The tin-copper alloy provides reliable wetting and metallurgical strength for general soldering of electronic components and metal joints where lead-free material is required. The product is intended for workshop, repair and light production tasks that call for a robust soft solder with a relatively large diameter for faster filling of joints.

Advantages

The high tin content ensures good flow and wetting on copper and common electronic finishes, while the copper addition improves joint strength and reduces the risk of brittle intermetallics compared with pure tin. The 2.5 mm diameter allows quicker deposition of solder in larger joints and mechanical connections. Being lead-free, this solder meets lead-restriction requirements for many repair and manufacturing environments. The spool format provides ease of handling and storage for workshop use.

Suitable for

• Soldering copper wires and terminals
• Repairing electrical connections and mechanical joints
• General-purpose electronics and metalwork where lead-free solder is required
• Workshop and field repair tasks requiring faster solder deposition

Key specifications

• Alloy composition: 97% tin, 3% copper
• Product form: soft solder wire on a spool
• Diameter: 2.5 mm
• Net weight: 100 g
• Lead-free alloy suitable for lead-restriction compliance

How to use

Prepare the surfaces by cleaning away oxidation, grease and contaminants to ensure good wetting. Use an appropriate flux compatible with tin-copper alloys if the wire is not rosin-cored. Heat the joint with a soldering iron or torch to the required temperature for the alloy, then apply the solder wire to the heated area so the molten solder flows into the joint. Avoid overheating to prevent damage to components and surroundings. Allow the joint to cool naturally for a reliable metallurgical bond.

Usage recommendations

For electronics and small components, use a temperature-controlled soldering iron with a suitable tip and a flux designed for lead-free tin-copper alloys. For larger mechanical joints, choose a heat source that provides even heating and work in a well-ventilated area. Store the spool in a dry place and keep away from acidic environments that may accelerate corrosion.