BROWNELLS - Ultra Flux 1 lb. Tub

BROWNELLS ULTRA FLUX®

The Brownells Ultra Flux® is a high-temperature soldering flux formulated specifically for use with silver solders, including Silvaloy 355 Silver Solder. Designed to improve solder flow and promote strong, clean joints, Ultra Flux® helps protect the workpiece during heating while ensuring optimal wetting and adhesion of the solder to the base metal.

Its creamy consistency allows for easy application with a brush and helps prevent drying, caking, or flaking during storage and use. Capable of withstanding temperatures up to 1600°F, Ultra Flux® is an excellent choice for demanding gunsmithing, metal fabrication, and silver soldering applications where reliable performance and clean results are essential.

Ideal for installing sights, sight ramps, ribs, scope bases, and other firearm components, Ultra Flux® helps improve solder flow characteristics while reducing oxidation during the heating process.

FEATURES

• Developed specifically for use with silver solders
• Ideal companion for Silvaloy 355 Silver Solder
• Protects metal surfaces during heating
• Improves solder flow and wetting characteristics
• Creamy consistency for easy brush application
• Resists drying and caking
• Suitable for precision gunsmithing applications
• Helps reduce oxidation during soldering
• Works on most common gunsmithing metals
• High-temperature performance up to 1600°F

SPECS

• Brand: Brownells
• Product Name: Ultra Flux®
• Application: Silver Soldering and Metal Joining
• Maximum Working Temperature: 1600°F
• Weight: 1 lb.
• Consistency: Cream/Paste
• Compatible Materials: Steel, Stainless Steel, Copper, Brass, Nickel Alloys
• Not Recommended For: Aluminum, Magnesium, Titanium
• Specification Compliance: Fed. Spec OF499 Type-B
• Specification Compliance: AMS 3410

INCLUDED

• Brownells Ultra Flux®

CUSTOMER INSIGHTS

Gunsmiths frequently use Ultra Flux® when installing sights, ribs, and other soldered firearm components because it helps silver solder flow more consistently while protecting the workpiece from excessive oxidation. Many users appreciate its creamy texture, which stays workable longer than thinner liquid fluxes and allows precise placement on small firearm parts.

The Brownells Ultra Flux® is a professional-grade, high-temperature flux engineered for silver soldering applications. Compatible with popular products such as Silvaloy 355 Silver Solder, it helps improve solder flow, protect metal surfaces, and create strong, clean joints. With a working temperature of up to 1600°F and compliance with Fed. Spec OF499 Type-B and AMS 3410, it is an excellent choice for firearm assembly, repair, and custom gunsmithing projects.