Conductive Pens and their Applications

The CircuitWorks® Conductive Pen makes high conductivity silver traces on circuit boards instantly. CW220 is used in repairing circuit boards, making prototypes, and reworking by repairing broken traces, joining components, and making smooth jumpers. The traces dry quickly in minutes and have excellent adhesion to most electronic materials. The CircuitWorks® Conductive Pen reduces the time taken to complete a project and rework time.

  • Single component system
  • High electrical conductivity
  • Rapid drying
  • Highly adherent to circuit boards
  • Operating temperature to 400 °F (205 °C)

Typical Applications

Some applications the CircuitWorks® Conductive Pen may be used in are:

  • Circuit Trace Repair
  • Solderless Linking of Components
  • EMI Shielding
  • Solderable Terminations
  • Quick Prototype Modifications

Typical Product Data and Physical Properties

. .
Composition
Material Silver Filled Polymer
Silver Particle Size 10-15 microns
Color Silver Gray
Setting Rate <2 mm/hr.
Properties
Conductivity 0.02-0.05 ohms/sq/mil
0.00005-0.000125 ohm cm
Max. Temperature 400 °F (205 °C)
Tack-Free Time @ 25 °C 3 to 5 Minutes
Cure Time @ 25 °C 20 to 30 Minutes
Solder Wetting 2 to 3 Seconds
Electrical Conductivity Excellent
Adhesion Excellent
Flexibility Good
Chemical Resistance Good
Shelflife 18 months

Compatibility

The CircuitWorks® Conductive Pen is compatible with materials used in the fabrication of printed circuit boards. However, substrate compatibility must always be checked on a non-critical area before use.

Usage Instructions

The MSDS must be read carefully before use.

Cleaning: To ensure the best adhesion and remove any surface contamination that may interfere with material contact, the board must be cleaned with either Chemtronics Electro-Wash® or Pow-R-Wash® solvents.

Mixing: Prior to use, the package should be shaken vigorously for about 30 seconds to ensure proper dispersion of the silver flakes, although the system has been formulated to prevent clumping. If the pen has not been used for some time, the mixing ball may seize in the barrel. To free it, the barrel end of the pen must be tapped with some force until the ball begins to move again.

Application: The conductive ink is dispensed through the pen. Squeezing the pen while pressing down on the surface will allow the material to flow, forming the trace. Practicing before doing detailed work will help. If the material needs to be applied in bulk, brushing, banding, or an automatic dispensing equipment may be used.

Thinning: Thinning the conductive ink is not required as it has been formulated to work in the CircuitWorks® Conductive Pen. But, if required the ink can be thinned by adding butyl acetate and mixing thoroughly.

Clean-up/Removal: The conductive ink can be removed or cleaned using a strong organic solvent like Chemtronics® Electro-Wash® PX.

Curing: The ink becomes tack-free in 3 to 5 minutes at room temperature and becomes electrically conductive in 30 minutes. When cured at 250 to 300 °F (120 to 150 °C) for 5 minutes, the ink achieves the maximum conductivity, durability, and chemical resistance.

Soldering: The heat-cured conductive traces can be soldered at 350 °F (177 °C) for < 5 seconds.

Availability

  • CW2200STP 8.5 g (0.3 oz.), Standard Tip Pen
  • CW2200MTP 8.5g (0.3 oz.), Micro Tip Pen

Technical and Application Assistance

Chemtronics→ provides a technical hotline to answer technical and application related questions. The toll free number is: 1-800-TECH-401.

This information has been sourced, reviewed and adapted from materials provided by Ted Pella, Inc.

For more information on this source, please visit Ted Pella, Inc.

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