• About Us
• Precious Metals & Alloys
  • Gold
  • Silver
  • Iridium
  • Platinum
  • Platinum Alloys
• Metals & Alloys
  • Tungsten
  • Tungsten Alloys
  • Molybdenum
  • Molybdenum TZM
  • Titanium
  • Tantalum
  • Niobium
• Silver Brazing Alloys & Fluxes
• Solders & Fluxes
  • Soft Solder Spec
  • Soft Solder Chart
• Periodic Table
• Quality Assurance
• Contact Us

SOFT SOLDERS:  

Composition - Pb₇₅Sn₂₅       

Melting Point ^oC - 183/266

Applications:

Crude solder for construction plumbing works, flame-melted. Used for soldering car engine radiators. Used for machine, dip and hand soldering of plumbing fixtures and fittings. Superior body solder.

Composition - Pb₇₀Sn₃₀       

Melting Point ^oC - 185/255

Applications:

Crude solder for construction plumbing works, flame-melted, good for machine and torch soldering. Used for soldering car engine radiators. Used for machine, dip and hand soldering of plumbing fixtures and fittings. Superior body solder.

Composition - Pb₆₀Sn₄₀       

Melting Point ^oC - 183/238 - 183/247

Applications:

For soldering of brass and car radiators. For bulk soldering, and where wider melting point range is desired. For joining cables. For wiping and joining lead pipes. For repairs of radiators and electrical systems.  

Composition - Sn₅₀Pb₅₀       

Melting Point ^oC - 183/216

Applications:

"Ordinary solder", for soldering of brass, electricity meters, gas meters, formerly also tin cans. General purpose, for standard tinning and sheetmetal work. Becomes brittle below −150 ^oC. Low cost and good bonding properties.  

Composition - Sn₆₀Pb₄₀    

Melting Point ^oC - 183/190

Applications:

Common in electronics, most popular leaded alloy for dipping. Low cost and good bonding properties. Used in both SMT and through-hole electronics. Rapidly dissolves gold and silver, not recommended for those. Slightly cheaper than Sn₆₃Pb₃₇, often used instead for cost reasons as the melting point difference is insignificant in practice.  

Composition - Pb₉₅Sn₅   

Melting Point ^oC - 308/312 - 301/314

Applications:

Low cost and good bonding properties. Used for coating steel and copper. Used in both SMT (Surface-mount technology) and through-hole electronics. Rapidly dissolves gold and silver, not recommended for those. Useful for high-temperature service and step soldering. Remains ductile at very low temperatures, can be used for parts subject to vibration at cryogenic applications.  

Composition - Pb₉₀Sn₁₀

Melting Point ^oC - 268/302

Applications:

Low cost and good bonding properties. Rapidly dissolves gold and silver, not recommended for those. Used for fabrication of car radiators and fuel tanks, for coating and bonding of metals for moderate service temperatures. Body solder Has low thermal EMF, can be used as an alternative to Cd70 where parasitic thermocouple voltage has to be avoided.