The Cynel – Sn99.3Cu0.7 SW26 Lead-Free Cored Solder Wire (2.50 mm, 100 g) is a high-quality solder alloy manufactured by Cynel-Unipress. Its Sn99.3Cu0.7 composition complies with ISO 9453 designation 401 and is specifically developed for lead-free soldering applications.
This silver-free alloy offers a cost-effective solution while maintaining excellent solderability and reliable joint formation. It is suitable for manual and automated soldering in electronics, telecommunications, automotive systems, and industrial electrical engineering.
The integrated SW26 rosin-based No-Clean flux (halide activated) provides strong wetting properties and stable solder joints. Flux residues are non-corrosive and normally do not require cleaning, although they can be removed with alcohol-based solvents if necessary.
With a melting point of 227°C, recommended soldering tip temperatures of 320–360°C (up to 400°C for nickel-plated components), and a flux content of 2.5% ±0.2%, the wire ensures consistent soldering performance. It is supplied in 100 g spools, clearly labeled with alloy type, flux specification, wire diameter, weight, and batch number, and has a shelf life of 5 years from the end of the production year.
TECHNICAL DETAILS:
| Specification | Details |
| Brand | Cynel |
| Model | Sn99.3Cu0.7 SW26 |
| Series | GRD |
| Alloy Composition | Sn99.3Cu0.7 (ISO 9453:401), also known as S-Sn99Cu1 |
| Solder Type | Lead-free, soft soldering |
| Product Form | Cored solder wire |
| Flux Type | SW26 (halide, rosin, No Clean) |
| Flux Content | 2.5% ±0.2% |
| Halide Content | 0.5% |
| Acid Number | 180 mg KOH/g |
| Copper Mirror Test | Passed (IPC-TM-650 2.3.32D) |
| Corrosiveness | Non-corrosive |
| Diameter | 2.50 mm (other diameters available: 0.25–4.00 mm) |
| Melting Point | 227°C (eutectic alloy) |
| Recommended Tip Temperature | 320–360°C (up to 400°C for nickel-plated elements) |
| Physical Properties | Density: 7.31 g/cm³; Resistivity: 0.126 μΩ•m; Thermal conductivity: 66 W/m•K; Tensile strength: 300 kg/cm²; Elongation: 21%; Hardness: 9 HB |
| Standards | ISO 9453, PN EN 29453:2000, RoHS Directive 2002/95/EC |
| Flux Designations | DIN 8511: SW26; ISO 9454-1: 1.1.2; J-STD-004: ROL1 |
| Packaging | Spools 100 g (carton box of 30 pcs), 250 g, 500 g, 1 kg (bulk cartons available) |
| Expiry Date | 5 years from end of production year (batch number indicates year) |
| Storage | Room temperature, dry place, out of reach of children |
| Application | Manual and automatic soldering in electronics, telecommunications, automotive, and industrial electrical engineering |
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