Brazing Flux Powder D-21 250g – Strong Steel & Copper Joints – Brazetec

Precision Brazing Flux for Automotive & Electrical Alloys | Brazetec. Brazetec Flux Powder D-21 – 250g of High-Performance Metal Joining Technology for Automotive & Electrical Industries. Brazetec Flux Powder D-21 (250g) is a professional-grade, water-mixable brazing flux specifically engineered for precision metal joining across a wide range of applications. Trusted by engineers, manufacturers, and metalworkers in the automotive, HVAC, and electrical sectors, this flux provides clean, oxide-free surfaces for optimal filler adhesion and high-strength bonds. Designed to work with steel, copper, copper alloys, nickel, and nickel alloys, Brazetec D-21 offers outstanding chemical performance during both flame and induction brazing, ensuring clean joints, reduced oxidation, and maximum bond strength. From vehicle heat exchangers to high-voltage electrical connectors, this versatile flux delivers consistent, reliable results. Mixable with water to create a brushable paste, the D-21 formula allows for controlled application, reduced waste, and highly accurate fluxing—making it an essential tool in high-precision industrial fabrication and repair work.

Perfect for

• Automotive component manufacturing and repairs
• Brazing of copper and steel in HVAC systems
• Electrical connector assembly and transformer production
• Metal fabrication in workshops and light industrial plants
• Brazing with flame or induction heating systems
• Professionals seeking water-mixable, paste-form brazing flux

Features

• Water-Mixable Formula – Easily converts to a brushable paste for precise application
• Multi-Metal Compatibility – Suitable for steel, copper, copper alloys, nickel, and nickel alloys
• Anti-Oxidation Performance – Maintains clean bonding surfaces during brazing
• Supports Flame & Induction Brazing – Versatile for multiple heat sources and environments
• Industrial-Grade Purity – Consistent results for mission-critical metal joining
• Ideal for High-Temperature Applications – Performs in demanding thermal cycles
• Convenient 250g Jar – Perfect for workshop or production-line usage

Benefits

• Stronger Joints – Delivers clean, oxide-free brazing surfaces for improved bonding
• Versatile Use Cases – One flux for a wide range of metals and applications
• Reduced Downtime – Clean application means less post-brazing cleanup and rework
• Minimized Waste – Paste application ensures only necessary flux is used
• Improved Electrical Conductivity – Ideal for connectors and electrical terminals
• Supports Sustainability Goals – Low-residue formula for cleaner production environments

Usage Tips

• Mix with clean water in a 1:1 or 2:1 ratio to create a paste for brush-on application
• Apply directly to cleaned metal surfaces before heating
• Use with silver brazing alloys or other compatible fillers
• Remove residue with warm water post-brazing if necessary
• Store sealed in a cool, dry area to maintain shelf life

What's in the box

• 1 x Brazetec Flux Powder D-21 (250g) 

Dimensions (cm) & Gross Weight

9 x 9 x 11 (0.25kg)