Kapp Cadmium-Zinc Multipurpose Solders

Cadmium-Zinc solders are medium temperature alloys that provide strong, corrosion- resistant joints on most metals. The eutectic solder is the industry standard, Kapp 509™. It melts and solidifies at 509°F and 265°C, making it an ideal solder for oven and automatic soldering systems. Increasing the Zinc content of the solder expands the slushy range, allowing the parts to be manipulated during solder cooling. Higher Zinc content also increases the strength and electrical conductivity of the solder joint.

Benefits and Uses

These solders are often used in applications requiring higher temperatures and superior strength joints. Cadmium-Zinc solders work especially well on Aluminum-to-Aluminum and Aluminum-to-Copper joints, with excellent corrosion resistance and superior strength in high vibration and high stress applications in electronics, lighting and electrical products.

The following chart represents Kapp Alloy’s standard Cadmium-Zinc alloys. Many factors, such as materials, temperature, and method of application determine the solder joint strength and characteristics. Call Kapp for engineering assistance to discuss your specific needs. We recommend testing appropriate alloys in your specific application to ensure suitability. Samples of Kapp alloys are always available upon request.

Physical Properties & Technical Data
Composition 83Cd -17Zn 70Cd - 30Zn 60Cd - 40Zn
Solidus(°F) 509 eutectic 509 509
Liquidus(°F) 509 572 600
Tensile Strength (copper) 24,000 psi 27,000 psi 30,000 psi
Shear Strength 11,000 psi 12,000 psi 13,000 psi
Elongation 2% 2% 2%
Electrical Conductivity (%IACS) 25.7 26 26.8
Composition Temperature
Sn Zn Pb Cd Ag Cu Sb RFQ Wire Ribbon 1/4" x14" 1/8" x18" Handy Vials
  17   83       265-265 509-509 170 X   X X X
  30   70       265-300 509-572 172 X   X X  
  40   60       265-316 509-600 174 X   X X  
Sn=Tin, Zn=Zinc, Pb=Lead, Cd=Cadmium, Ag=Silver, Cu=Copper, Sb=Antimony

All Kapp Aluminum solders are available in bar or wire form. Custom alloys and forms are our specialty.


  • Diameters from .031" (1/32") to .187" (3/16").
  • Spool sizes: 1 lb., 5 lbs., 25 lbs., and 50 lbs.
    Also available in convenient 18" X 1/8" rods.
  • spray wire Pay-out Paks: 250 lbs. or 500 lbs* of continuous wire

*Kapp does not recommend 500 lbs. payout paks for wire sizes smaller than 1/8" (.125)


  • RegBar - 1+ lb. each - Molds are 13.5" L x 0.75" W x 0.5" D with oval ends.
  • 2 Lb. Bar - 2+ lbs. each - Molds are 10.5" L x 1" D, 1.5" W tapering to 1".
  • Notch Bar - 6+ lbs. each - Molds are 11" L x 2.25" W x 1.25" D with 4 notches, 5 sections per bar.