SUPERFLOW 5 BCuP-3 5% Silver Phos-Copper Brazing Alloy – 1/8" x .050" x 20" – 1 lb Pack

5% silver phosphorus-copper brazing alloy for joining copper, brass, and bronze.
SUPERFLOW 5 is an AWS BCuP-3 phos-copper brazing alloy containing approximately 5% silver. It is formulated for brazing compatible copper and copper alloys and can be used where joint clearances are wider than desired and moderate-size gaps need to be filled.

SUPERFLOW 5 is self-fluxing when brazing copper-to-copper. When brazing compatible brass or bronze, an appropriate brazing flux is required.

Size: 1/8" x .050" x 20"
Package: 1 lb Pack

Important: Phos-copper brazing alloys should not be used on steel, ferrous metals, copper alloys containing more than 10% nickel, or in sulfurous atmospheres.

Product Size & Package

Key Features

• Approximately 5% Silver: Contains 4.8–5.2% silver.
• AWS BCuP-3: Classified to AWS A5.8/A5.8M BCuP-3.
• For Copper, Brass & Bronze: Formulated for brazing compatible copper and copper alloys.
• Self-Fluxing on Copper: No additional flux is required for compatible copper-to-copper brazing.
• Moderate Gap Filling: Can be used where joint clearances are wider than desired and moderate-size gaps need to be filled.
• Bright Light Copper Color: Produces a bright, light copper-colored braze.
• 1325–1500°F Brazing Range: Manufacturer-listed brazing range of 1325–1500°F (718–816°C).
• 20" Length: Supplied in 20" brazing alloy strips.
• 1 lb Package: Sold as a complete 1 lb pack.

Common Applications

• Copper-to-copper brazing
• Compatible brass components
• Compatible bronze components
• Copper tubing and fittings
• Joints with moderate clearances
• Plumbing applications
• Heating applications
• HVAC and refrigeration applications
• General copper fabrication and repair

Flux Requirements

Chemical Composition

Physical Properties

SUPERFLOW 5 for Moderate Joint Gaps

SUPERFLOW 5 is formulated for applications where joint clearances are wider than desired. The alloy can fill moderate-size gaps, making it useful when the joint fit-up is not as close or controlled as applications that use more free-flowing brazing alloys.

Proper joint preparation, cleanliness, temperature control, and base-metal compatibility are still important for producing a sound brazed joint.

Important Material Restrictions

Do not use SUPERFLOW 5 on the following materials or in the following environments:

• Steel
• Ferrous metals
• Copper alloys containing more than 10% nickel
• Sulfurous atmospheres

Phosphorus-copper brazing alloys are intended for compatible copper and copper-alloy applications. Always confirm base-metal compatibility before brazing.

Understanding BCuP-3

BCuP-3 identifies SUPERFLOW 5 as a silver-bearing copper-phosphorus brazing filler metal. The alloy contains approximately 5% silver, 5.8–6.2% phosphorus, and a balance of copper.

The phosphorus provides self-fluxing characteristics on compatible copper-to-copper joints, while the alloy is formulated to work with wider joint clearances and moderate-size gaps.

Frequently Asked Questions

What size is this brazing alloy?
This listing is for 1/8" x .050" x 20" SUPERFLOW 5 brazing alloy.

How is SUPERFLOW 5 packaged?
It is sold as a complete 1 lb pack.

How much silver does SUPERFLOW 5 contain?
Washington Alloy specifies 4.8–5.2% silver, commonly referred to as a 5% silver brazing alloy.

What is the AWS classification?
SUPERFLOW 5 is classified as AWS A5.8/A5.8M BCuP-3.

What materials can SUPERFLOW 5 braze?
It is formulated for joining compatible copper, brass, and bronze.

Do I need flux when brazing copper?
Not for compatible copper-to-copper joints. Phos-copper alloys such as SUPERFLOW 5 are self-fluxing on copper.

Do I need flux when brazing brass or bronze?
Yes. An appropriate brazing flux is required when working with brazeable grades of brass or bronze.

Can SUPERFLOW 5 fill gaps?
Yes. Washington Alloy states that SUPERFLOW 5 may be used where joint clearances are wider than desired and can fill moderate-size gaps.

Can SUPERFLOW 5 be used on steel?
No. Phos-copper alloys should not be used on steel or other ferrous metals.

Can it be used on copper alloys containing nickel?
It should not be used on copper alloys containing more than 10% nickel.

What is the brazing range?
Washington Alloy lists a brazing range of 1325–1500°F (718–816°C).