Description
Stella St-A2CuP6 Copper-Phosphorus Solder with 2% Silver Content (rod Ø 1.5x500 mm, Italy)
High-quality Stella St-A2CuP6 copper-phosphorus solder (with 2% silver addition) from the leading Italian manufacturer Stella Welding Alloys. Designed for capillary brazing of 'copper-to-copper' and 'copper-to-bronze/brass' joints. The presence of silver in the composition significantly improves the solder's fluidity, lowers the melting point, and increases the ductility of the joint. When brazing copper to copper, the solder is self-fluxing due to the phosphorus content and does not require additional fluxes.
Key Advantages and Features:
- Self-fluxing properties (for 'copper-to-copper' brazing): The phosphorus content effectively removes the oxide film from the copper surface, eliminating the need for flux.
- Increased ductility (Ag 2%): The addition of silver increases vibration resistance and mechanical strength of the brazed joint compared to standard silver-free copper-phosphorus solders.
- Excellent fluidity: Ensures fast and deep filling of capillary gaps between the parts being joined.
- High alloy purity: Contains no iron or nickel, making it widely used in electrical engineering for joint operating temperatures up to +200°C.
- European quality: Manufactured in Italy in compliance with strict international quality standards for brazing materials.
Application Areas:
- Refrigeration and air conditioning: Installation and repair of Freon lines, split systems, evaporators, and condensers.
- Plumbing and heating: Brazing copper pipes in hot/cold water supply and central heating systems.
- Electrical industry: Joining copper busbars, contacts, motor windings, and transformers (operating temperature up to +200°C).
Technical Specifications:
| Parameter | Value / Characteristic |
|---|---|
| Brand / Manufacturer | Stella Welding Alloys (Italy) |
| Solder Grade | St-A2CuP6 (A2CuP) |
| Chemical Composition of Alloy | Silver (Ag) — 2% / Phosphorus (P) — 6.5% / Copper (Cu) — 91.5% (base) |
| Melting Range | 645°C – 825°C |
| Recommended Brazing Temperature | 740°C |
| Maximum Joint Operating Temperature | Up to +200°C |
| Form | Round rod |
| Rod Dimensions | Diameter 1.5 mm / Length 500 mm |
Package Contents:
- Stella St-A2CuP6 copper-phosphorus solder (1.5x500 mm rod) — 1 pc.
Pro tip: No flux is required when brazing 'copper-to-copper' joints. However, when brazing copper to brass or bronze, be sure to use a specialized brazing flux (e.g., Stella Cu-Flux) to break down the oxide film on the brass/bronze parts. Copper-phosphorus solders are not used for brazing steel or cast iron due to the formation of a brittle phosphide layer!
