32136 - Harris Sil-Fos 5 Brazing Rod 5% Silver 2.5mm (25lb Tube)

Industry Standard Sil-Fos 5 Brazing Alloy for HVAC/R

The Harris Sil-Fos 5% Silver Brazing Rod is the go-to filler metal for professional HVAC and refrigeration contractors. Supplied in a substantial 25lb bulk tube, this product is designed for high-volume operations where consistency and quality are paramount. The 2.5mm diameter provides excellent control for the operator, allowing for precise application on standard copper piping sizes found in air conditioning and refrigeration units.

Sil-Fos 5 is a copper-silver-phosphorus alloy that is specifically engineered for joining copper to copper. One of its primary advantages is its self-fluxing capability. The phosphorus content in the rod acts as a fluxing agent when heated, eliminating the need for a separate flux application on copper joints. This not only speeds up the brazing process but also reduces the risk of flux inclusions and simplifies post-braze cleaning. For brass or bronze applications, a separate flux (like Stay-Silv white flux) is required.

This alloy is renowned for its ability to fill gaps and form robust fillets. Unlike higher silver content alloys that flow very quickly (like 15%), Sil-Fos 5 has a wider melting range. This "plastic range" allows the operator to cap off joints and bridge loose fit-ups effectively, making it forgiving to use in field conditions. It is the ideal choice for installing evaporator coils, repairing condenser lines, and general plumbing fabrication.

Key Benefits for Contractors

• Cost-Effective: 5% silver content offers a great balance between performance and cost compared to 15% alloys.
• Efficiency: No flux required for copper-to-copper connections saves time and material.
• Durability: Creates strong, ductile, and corrosion-resistant joints suitable for high-vibration environments.
• Bulk Supply: The 25lb tube ensures you have ample stock for large projects or fleet inventory.