KA09 Tin-Zinc Solder (1/16″) Wire

KA09 Tin-Zinc Solder (1/16″) Wire

KA09 Tin-Zinc Solder is a specialized alloy designed for joining aluminum-to-aluminum and aluminum-to-copper connections. Engineered with a 91% tin and 9% zinc composition, this solder bridges the gap between soft solder and silver brazing alloys. Its controlled melting range begins at 390°F (199°C), making it a reliable choice for delicate assemblies where excess heat could damage electronics or deform substrates.

Benefits of Low-Temperature Aluminum Soldering:

Unlike traditional solders, KA09 offers excellent corrosion resistance, strong tensile strength, and electrical conductivity. Because it operates at a lower melting point than brazing alloys, it reduces the risk of overheating while still providing a durable bond. As a result, builders, technicians, and audio professionals choose it for applications where strength and reliability matter.

Pairing With Ultra Gold Flux:

For best performance, always use Ultra Gold Flux with KA09 Tin-Zinc Solder. This flux is formulated for aluminum soldering and ensures clean, oxide-free joints. Together, the solder and flux create a stable, long-lasting bond while minimizing rework. Remember: overheating above 550°F can char the flux, so precise temperature control is essential.

Common Applications:

• Aluminum voice coil soldering in subwoofers and speakers

• Copper-to-aluminum electrical splices

• High-voltage and power-switching equipment

• Thin aluminum sheet, tab, and connector bonding

• Audio, capacitor sealing, and sound equipment manufacturing

Technical Properties:

• Composition: 91% Sn (Tin), 9% Zn (Zinc)

• Diameter: 0.062″ (1/16″)

• Density: 7.27 g/cc

• Tensile Strength: 7,930 psi

• Elongation at Break: 32.5%

• Thermal Conductivity: 61.0 W/m-K

• Melting Range: 390°F (199°C)

Why Choose KA09 Tin-Zinc Solder?

Because it combines strength, corrosion resistance, and temperature control, KA09 is ideal for aluminum-based projects that demand reliability. Whether you’re repairing voice coils or building high-voltage systems, this solder delivers consistent performance and professional-grade results.