Soldering Paste UNIPAK Unisil 4948 for hard soldering 100 g, MPN 4545210

UNIPAK Unisil 4948 soldering paste is designed for hard soldering (brazing) applications and is supplied in a 100 g container. The formulation promotes wetting and joint formation during high-temperature brazing on compatible metals, facilitating stronger metallurgical bonds than soft soldering. The product is intended for use in repair, assembly and joining tasks where brazed connections are required and where control of filler flow and surface activity is important for consistent results.

Advantages

The soldering paste improves capillary flow and wetting of base metals, reducing the likelihood of voids and poor joints. It is supplied in a practical 100 g size suitable for workshop use, and its consistent consistency allows controlled application to seams and joints. The composition is formulated to support high-temperature brazing processes, enabling reliable metallurgical bonding on compatible substrates when applied and heated according to recommended practices.

Suitable for

• Repair and restoration of metal components requiring brazed joints
• Assembly of mechanical parts where high-strength connections are needed
• Joining of copper, brass, and compatible alloys in plumbing and HVAC work
• Workshop and light industrial brazing tasks where paste application is preferred

Key specifications

• Intended use: hard soldering (brazing) aid
• Form: paste for direct application to joints
• Package size: 100 g
• Compatibility: formulated for use with common brazing filler metals and compatible base metals
• Performance: promotes wetting and capillary action during high-temperature heating

How to use

Clean joint surfaces thoroughly to remove oxides, oils and contaminants before applying UNIPAK Unisil 4948. Apply a thin, even layer of paste along the joint area to guide filler flow during heating. Use appropriate brazing filler metal and a suitable heat source to reach the required brazing temperature; heat until the filler flows and forms a continuous fillet. Allow the assembly to cool, then clean residual flux and paste according to safety and handling guidance to prevent corrosion or contamination of the joint.

Usage recommendations

Follow manufacturer safety data and handling instructions. Use adequate ventilation and appropriate personal protective equipment when brazing. Verify compatibility of base metals and filler alloys before use, and perform a small test joint if material compatibility or process parameters are uncertain.