30211 - Sil-Fos 2% Silver Brazing Alloy Rods 3.2mm x 20" (25lb Bulk Tube)

Industrial Grade 2% Silver Brazing Alloy (BCuP-6)

The Brazing Rod Silfos 2% 3.2mm 20" Length 25lb Tube is a premium consumable designed for high-volume industrial brazing applications. This alloy, classified under the AWS standard as BCuP-6, is formulated with approximately 2% silver, 7% phosphorus, and the balance copper. This specific composition makes it an excellent choice for joining copper-to-copper and copper-to-brass assemblies where moderate ductility and cost-efficiency are paramount. The addition of 2% silver significantly improves the physical properties of the joint compared to standard phos-copper rods (BCuP-2), offering enhanced resistance to vibration and thermal cycling, which is critical in HVAC and refrigeration systems.

Supplied in a substantial 25lb bulk tube, this product is tailored for large-scale fabrication shops, mechanical contractors, and maintenance departments that require a consistent supply of brazing filler metal. The rods feature a 3.2mm (1/8 inch) diameter, which provides substantial deposition rates and excellent gap-filling characteristics, making it suitable for larger pipe diameters and fittings that may not have perfect capillary tolerances. The extended 20-inch length is a practical feature for professional operators, reducing the frequency of rod changes and allowing for longer continuous brazing passes, thereby improving workflow efficiency.

One of the key technical advantages of this Silfos 2% alloy is its self-fluxing capability on copper base metals. The phosphorus content acts as a fluxing agent when heated, dissolving surface oxides and allowing the alloy to wet and flow smoothly without the need for additional chemical flux. This not only speeds up the production process but also eliminates the risk of flux entrapment inside the joint, which can lead to corrosion over time. For applications involving brass or bronze, a separate flux is required to ensure proper wetting. With a liquidus temperature of approximately 1450°F (788°C) and a solidus of 1190°F (643°C), this alloy offers a wide melting range, giving operators greater control over the weld pool and the ability to build up fillets where necessary.

Key Industrial Benefits:

• Cost-Effective Performance: Provides better joint reliability than 0% silver rods at a fraction of the cost of 15% silver alloys.


• Bulk Packaging: The 25lb rigid tube protects the rods from moisture and physical damage during storage and transport.


• Versatility: Suitable for a wide range of low-pressure steam, gas, and liquid piping systems.