PCB Unlimited is a leading distributor of solders and related materials for electronics assembly. Whether you require lead free or leaded solders in solder wire, solder paste or solder bar form, we offer extensive products from leading solder manufacturers.

Solder Paste

Solder paste is available for immediate delivery in 250 gram jars and 30 gram syringes:

  • Leaded No Clean & Water Soluble Solder Paste
  • Lead Free No Clean & Water Soluble Paste

To help us meet your specific needs, please provide us with information on your alloy, flux type, powder size and packaging preferences.

DIY Solder Paste
This paste is a high quality, low cost prototyping solder paste. Since it's premixed, all you need to do is, cut off the tip, squeeze the paste onto your solder pads and heat it up using a solder gun, heat gun, hot plate or any other suitable heat source. It's simple, convenient and best of all, it's made in the USA!
Clock fast Lead Time: In Stock Money orange $5.95
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NC676 No Clean Solder Paste
The NC676, manufactured by FCT Solder, is a new generation halide-free, rosin-based chemistry designed to provide a previously unseen level of repeatability and consistency to the printing process. Ideal for leaded printed circuit board assembly.
  • Alloy Sn63/Pb37 MP=183°C
  • Stencil life > 8 hours
  • Extensive Tack Time
  • Halogen and Halide Free
  • Speed 25 to 150 mm/sec.
  • Clear Residue
Clock fast Lead Time: In Stock Money orange $15.00
WS159 Water Soluble Solder Paste
The WS159, manufactured by FCT Solder, is designed to provide humidity tolerance and excellent wetting to meet the requirements for reliable solder joints in printed circuit board assemblies.
  • Alloy Sn63/Pb37
  • Stencil life > 6 hours
  • Good Activity
  • Cleans Easily
  • Speed: 25 to 150 mm/sec.
  • Shiny Solder Joints
Clock fast Lead Time: In Stock Money orange $15.00
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Wire Solder

Wire solder is available for immediate delivery in 015" and 0.31" wire diameters.

  • Leaded No Clean & Water Soluble
  • Lead Free No Clean & Water Soluble

Core wire solder is available in many alloys, including lead-free formulations. Core wire is typically packaged in one pound rolls but other packaging is available upon request.

Kester Wire Solder, Sn63/Pb37, # 331 Water-Soluble Flux, 1-lb. Roll
Kester Formula #331 is a high-activity, water soluble core flux for soldering difficult metals on printed circuit boards. It exhibits the same fast action and mild properties as Kester's popular 2331-ZX neutral organic water soluble liquid flux. The flux is more heat stable than most organic fluxes, resulting in minimal smoke and odor. Its residue can be completely removed with a simple water rinse.
  • Sn63Pb43 Alloy
  • .015" and 0.031" Wire Diameters
  • #331 Water Soluble Flux
  • #66 Flux Core Size
Clock fast Lead Time: In stock and ready for shipment Money orange $30.00
Kester Wire Solder, Sn63/Pb37, # 245 No-Clean Flux, 1-lb. Roll
Kester 245 No-clean Cored Wire was developed to complement low residue liquid fluxes being used by the electronics industry. The chemistry is based on some of the same principles that have been safely used for years in mildly activated rosin fluxes.
Clock fast Lead Time: 3 Days Money orange $33.86
POWER CORE WS101 Wire Solder
POWER CORE WS101 wire solder is a high activated water washable for repairing through-hole, mixed and surface mount assemblies. The flux core provides faster and better fluxing activity than RA flux cores. WS101 flux is formulated to provide high activity soldering, leaving an easily washable residue in plain water without the need for cleaning additives.
Clock fast Lead Time: In stock and ready for shipment Money orange $35.00
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Bar Solder

Bar solder available for immediate delivery in in 25-pound boxes.

Our bar solder meets today’s electronic manufacturing processes by providing a strong and reliable solder joint. Less dross, fewer bridges, and more reliable solder joints mean increased production efficiencies and improved return on your solder investment.

Nitro-Flo Plus Bar Solder (63/37 Tin/Lead)
Nitro-Flo Plus bar solder goes through a manufacturing process that yields a bar that will produce the lowest dross levels during soldering operations which is ideal for the printed circuit board process.
  • Alloy Pure 63/37 Tin/Lead
  • Low Dross Level
  • Melting Point: 177°C/350°F
  • Available in 50 Lb box
Clock fast Lead Time: 3 Weeks Money orange $413.00
SN100C Lead Free Bar Solder
SN100c Bar Solder unique's properties make it possible to achieve high productivity in soldering for the printed circuit board process offering cost effective reliable joints.
  • Alloy Sn-Cu+Ni
  • Spread Factor is 77-78%
  • Melting Point:227°C/450°F
  • Available in 25 Lb box
Clock fast Lead Time: 3 Weeks Money orange $438.00
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Liquid Solder Flux

Liquid Flux for wave soldering through-hole, mixed and surface mount assemblies is available for immediate delivery in 1-gallon container.

Additional products and custom formulations are also available upon request.

NC160 Lead Free Flux
NC160 NO CLEAN FLUX is a halide-free, no clean activated material for printed circuit board surface mounting. NC160 is formulated to work with Printed Circuit Board Assembly’s SN100C Bar Solder.

  • A solder temperature of 250-260 degrees C should be maintained
  • Excellent Solderability
  • Available 1 Gallon Container
Clock fast Lead Time: 4 Days Money orange $25.00
NC110 No Clean Flux
NC110 Low Residue NO CLEAN FLUX is a halide-free, non rosin, organic 2% solids activated material for wave soldering through-hole, mixed and for printed circuit board assemblies.

  • A solder temperature of 230-250 degrees C is recommended
  • Excellent Solderability
  • Available in 1 Gallon Container
Clock fast Lead Time: 4 Days Money orange $50.00
NC120 No Clean Flux
NC120 Low Residue NO CLEAN FLUX is a halide-free, non rosin, organic 2% solids activated material for wave soldering through-hole, mixed and for printed circuit board assemblies.

  • A solder temperature of 230-250 degrees C Recommended
  • Excellent Solderability
  • Available in 1 Gallon Container
Clock fast Lead Time: 4 Days Money orange $110.00
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