Castolin LUT TWARDY CU FLAM RB 5286 CUP 5% AG - 500×2 mm soldering rod, 200 g

Castolin LUT TWARDY CU FLAM RB 5286 CUP 5% AG is a copper-based brazing and soldering rod with 5% silver content, supplied as 500×2 mm rods in a 200 g package. Formulated for creating strong, conductive and corrosion-resistant joints, this alloy is intended for tasks that require improved mechanical strength and thermal conductivity compared with plain copper filler metals. The rod is appropriate for use with flame and torch brazing techniques on compatible base metals and for repair and maintenance work in mechanical, HVAC and plumbing systems.

Advantages

The 5% silver content increases wetting and flow characteristics, producing sound fillets with good capillary action and consistent joint penetration. The copper-based matrix provides high thermal and electrical conductivity while maintaining resistance to corrosion in typical service environments. Supplied in uniform 500×2 mm rods, the product offers predictable feed and handling during manual brazing operations and reduces the need for frequent rod changes during medium-scale jobs.

Suitable for

• Repair and joining of copper, brass and compatible copper alloys
• HVAC and refrigeration piping, heat exchangers and condensers
• Plumbing installations and service work
• Industrial maintenance where mechanically strong, conductive joints are required

Key specifications

• Alloy type: copper-based filler with 5% silver
• Form: solid rod
• Rod dimensions: 500 × 2 mm
• Net weight: 200 g per pack
• Application method: flame/torch brazing and manual soldering techniques
• Properties: improved wetting, good capillary flow, high thermal and electrical conductivity

How to use

Clean base metal surfaces to remove oxides, oils and contaminants before brazing. Select an appropriate flux and apply it to the joint area if required by the base metals and the chosen brazing process. Heat the assembly uniformly with a suitable torch until the joint reaches the recommended brazing temperature for the alloy system; touch the molten filler rod to the heated joint so that capillary action draws the alloy into the gap. Allow the assembly to cool gradually and remove any residual flux or oxidation products according to the flux manufacturer’s guidance.

Usage recommendations

Use appropriate personal protective equipment and ventilation when flame brazing. Verify compatibility of the filler with the base metals and follow specified brazing temperatures for silver-bearing copper fillers. Store rods in a dry environment to avoid surface contamination that can impair wetting and flow.