KappFree™- THE Lead Free, Cadmium Free Multipurpose Solder

KappFree™ solder is a Lead Free, Cadmium Free formulation designed specifically to replace Lead solders in Copper and Stainless Steel plumbing, and in electrical and electronic applications. KappFree™ is simple, effective and easy to use in both manufacturing and field applications. KappFree™ provides superior joint strength, vibration resistance, and thermal cycle fatigue resistance in both piping and electrical products. KappFree™ has been used successfully for over a decade in the Lead Free manufacture of electrical and mechanical connectors, heat exchangers, and electronic components for harsh environments.


Ready to purchase? You can shop for this item online: Solder Direct Logo

Benefits and Uses

KappFree™ has been designed to accomplish three important Lead Free, Cadmium Free objectives:

  1. Produce a cost effective, Lead Free / Cadmium Free composition to address environmental and health concerns meeting ASTM and NSF Food Grade and Potable Water Standards
  2. Allow easy application at low temperatures with any heat source
  3. Provide superior strength and corrosion resistance to Tin-Lead solders

KappFree™ also offers important advantages over Silver brazing alloys:

  • Lowers material costs (up to 4 times more cost effective)
  • It can be produced up to 4 times faster due to ease of use and a lower process temperature
  • Faster post-production cleanup, often requiring only inspection
  • Non-Toxic, Lead Free, and Cadmium Free
  • Eliminates the effects of high heat used in brazing avoids base metal deformation, discoloration, segregation, annealment, and heat related oxide-scale formation, to name a few benefits

The following chart contains typical physical properties for KappFree™ solder joints. *Strength values are for an average joint on Copper-to-Copper, and are general guidelines when selecting solder for a particular application. Strength and ductility characteristics vary greatly with changes in soldering techniques and base metal alloys.

The following chart represents standard KappFree™ Tin-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
Melting Range 440F - 500F / 226C - 260C
Tensile Strength 10,000psi*
Shear Strength 5,000 psi*
Hardness (Brinell-500 kg. load) 100
Ductility Good
Density 0.2669 lbs/cubic inch
Elongation 3% in 2 inches.
Electrical Conductivity 24.9 (%IACS)
Thermal Conductivity .24 cal / cm3 / C
Corrosion Penetration 300 x 106 in 1 1 / R
Flux Kapp Copper-Bond Flux