SUPERFLOW 15 BCuP-5 15% Silver Phos-Copper Brazing Alloy – 1/8" x .050" x 20" – 1 lb Pack

15% silver phosphorus-copper brazing alloy for copper, brass, and bronze applications.
SUPERFLOW 15 is an AWS BCuP-5 phos-copper brazing alloy containing approximately 15% silver. It is formulated for joining compatible copper, brass, and bronze and is widely used for air conditioning, refrigeration, electrical, and general copper brazing applications.

SUPERFLOW 15 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 15% Silver: Contains 14.5–15.5% silver.
• AWS BCuP-5: Classified to AWS A5.8/A5.8M BCuP-5.
• For Copper, Brass & Bronze: Formulated for brazing compatible copper and copper-alloy applications.
• Self-Fluxing on Copper: No additional flux is required for compatible copper-to-copper brazing.
• HVAC & Refrigeration Applications: Commonly used for air conditioning and refrigeration brazing.
• Electrical Applications: Suitable for compatible copper brazing applications used in electrical work.
• Bright Silver-Copper Color: Produces a bright silver-copper-colored braze.
• 1300–1500°F Brazing Range: Manufacturer-listed brazing range of 1300–1500°F (704–816°C).
• 20" Length: Supplied in 20" brazing alloy strips.
• 1 lb Package: Sold as a complete 1 lb pack.

Common Applications

• Air conditioning systems
• Refrigeration systems
• HVAC copper tubing
• Copper-to-copper brazing
• Compatible brass components
• Compatible bronze components
• Electrical applications
• Copper tubing and fittings
• Plumbing and heating applications
• General copper fabrication and repair

Flux Requirements

Chemical Composition

Physical Properties

Designed for HVAC, Refrigeration & Copper Brazing

SUPERFLOW 15 is a commonly used phos-copper brazing alloy for air conditioning and refrigeration applications. Its BCuP-5 composition combines copper and phosphorus with approximately 15% silver for compatible copper and copper-alloy brazing applications.

It can also be used for compatible electrical, plumbing, heating, fabrication, and repair applications where BCuP-5 brazing filler metal is specified.

Important Material Restrictions

Do not use SUPERFLOW 15 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-5

BCuP-5 identifies SUPERFLOW 15 as a silver-bearing copper-phosphorus brazing filler metal. The alloy contains approximately 15% silver, 4.8–5.2% phosphorus, and a balance of copper.

The phosphorus provides self-fluxing characteristics when brazing compatible copper-to-copper joints. Flux is required when brazing compatible brass or bronze.

Frequently Asked Questions

What size is this brazing alloy?
This listing is for 1/8" x .050" x 20" SUPERFLOW 15 brazing alloy.

How is SUPERFLOW 15 packaged?
It is sold as a complete 1 lb pack.

How much silver does SUPERFLOW 15 contain?
Washington Alloy specifies 14.5–15.5% silver, commonly referred to as a 15% silver brazing alloy.

What is the AWS classification?
SUPERFLOW 15 is classified as AWS A5.8/A5.8M BCuP-5.

What materials can SUPERFLOW 15 braze?
It is formulated for joining compatible copper, brass, and bronze.

Is SUPERFLOW 15 used for HVAC and refrigeration?
Yes. Washington Alloy identifies SUPERFLOW 15 as an industry-standard alloy for many air conditioning and refrigeration applications, as well as electrical applications.

Do I need flux when brazing copper?
Not for compatible copper-to-copper joints. Phos-copper alloys such as SUPERFLOW 15 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 15 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 1300–1500°F (704–816°C).