KappZappSOS

Tin-Silver Solder

KappZapp4SOS™ Tin-Silver solder is an NSF-compliant Lead-free Cadmium-free solder designed specifically for one step soldering of stainless steel components. It also provides a strong and ductile joint with a high tolerance to vibration and stress on Copper and Brass. Its highly active flux core paired with its wide workable range of 430-440°F (221-227°C) makes it the ideal solder for stainless steel applications in any orientation. In many cases, a stronger overall assembly exists after joining with KappZapp4SOS™ than with higher temperature Silver brazing alloys.

NSF-Compliant

This product complies with NSF/ANSI Standard 372: Drinking Water System Components – Lead Content. Product also complies with NSF/ANSI 61, Annex G and conforms with Lead content requirements for “Lead-free” plumbing as defined by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking Water Act in effect as of January 4, 2014. Weighted average lead content < 0.25%; Solder and flux lead content < 0.20%.

This alloy complies with the European RoHS and REACH directives. No lead, cadmium or mercury used in production.

Benefits & Features

KappZapp4SOS’s highly active acid core effectively breaks down the tough oxide layer on stainless steel and ensures a strong bond is made in one step. This solder’s low slushy range of 430-475°F (221-246°C)
minimizes the heat applied and distortion of thin wires, tabs, and sheets.

Applications

• Stainless Steel, copper and brass plumbing, tube, and sheet applications
• Fabrication, ducting, food containers, storage bins, and cooling coils for refrigerators
• Food and potable water safe
• Used throughout the food processing industry for the manufacture and repair of Stainless Steel parts and components
• Paired with Kapp Comet™ Flux when extra flux is needed
• Acid-Cored Solders are not recommended for electrical/electronic applications, unless the joint area can be thoroughly cleaned of any residue. Consider KappZappR™ Rosin-Cored Solders for electrical / electronic applications

Properties

Composition
Sn (Tin):	96%
Ag (Silver):	4%
Technical Data
Melting Range:	430-475°F (221-246°C)
Tensile Strength (Copper):	14,200 psi
Tensile Strength (Stainless Steel):	28,000 psi
Shear Strength:	11,600 psi
Elongation:	49%
Electrical Conductivity:	16.5%
Sn=Tin, Ag=Silver

Product Variants

KappZapp4SOS™ is available in standard forms:

• 1/8” (0.125”) (3.2mm)

Custom alloys and forms are our specialty. Call a Kapp representative to discuss what size and diameter are right for you.

Matching Kapp Comet™ Flux

For most alloys and projects, no additional flux is required when working with KappZapp3.5A™ acid cored solder. Some highly polished Stainless Steel alloys contain more Chromium and Nickel. These parts may require extra effort to remove the oxide layer by sanding, scratching with a Stainless Steel brush or emory paper, and by the addition of liquid Comet™ Flux.

Click here for KappZapp4SOS™ Technical Data Sheet

Click here for KappZapp4SOS™ Safety Data Sheet

Click here for instructions on how to use KappZapp4SOS™