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2.7 Epoxy Mixing and Handling

  • This procedure covers epoxy mixing and handling. The epoxy covered by this procedure has multiple uses including solder mask repair, base board repair, circuitry over-coating and delamination repair. For prepackaged epoxy, remove divider clip and mix resin and hardener inside package.
  • Apply epoxy as needed. Foam swabs may be used to add texture for solder mask repair.
Outline
This procedure covers epoxy mixing and handling. The epoxy covered by this procedure has multiple uses including solder mask repair, base board repair, circuitry over-coating and delamination repair.

Note
For high strength or high temperature applications two part epoxies will generally have the best properties.

Minimum Skill Level - Intermediate
Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.

Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.

Procedure References
1.0 Foreword
2.1 Handling Electronic Assemblies
2.2 Cleaning
2.5 Baking And Preheating
IPC7721 2.7 Epoxy Mixing and Handling
Tools and Materials
CircuitMedic Part
Alcohol Swab
Self-saturating Isopropyl alcohol swab. Squeeze handle to release alcohol.
CircuitMedic Part
Cleaning Brushes
Disposable brushes for use with solvents for cleaning and application of coatings.
CircuitMedic Part
Circuit Bond Packs
Clear, superior strength epoxy in two-compartment plastic packages
CircuitMedic Part
Foam Swab
Ideal for absorbing cleaning solvents, and applying color agents and epoxies.
Images and Figures
2.7 Epoxy Mixing and Handling
Figure 1: For prepackaged epoxy, remove divider clip and mix resin and hardener inside package.
2.7 Epoxy Mixing and Handling
Figure 2: Apply epoxy as needed. Foam swabs may be used to add texture for soldermask repair.
Epoxy Specifications
Epoxies used for circuit board repair and rework require specific properties. The Epoxy referenced in this procedure is a clear, low viscosity, superior strength two-part epoxy. It is available in two-compartment plastic packages so no measuring is needed.

See the Related Products below for details about the Epoxy referenced in this procedure.

Preparation
The area where the epoxy is to be applied should be prepared prior to mixing the epoxy. This preparation may include preheating the affected area to improve absorption of the applied epoxy. The entire circuit board may also be heated in an oven or with a heat lamp.

Caution
Some components may be sensitive to high temperatures.

Procedure - Prepackaged Two Part Epoxy
  1. Remove the clip separating the resin and hardener. Mix by squeezing both halves together with your fingers. Mix for at least one minute to ensure a complete mix of the resin and activator. (See Figure 1)
  2. Cut open one end of the epoxy tube and squeeze the contents into a mixing cup. Mix again with a mixing stick to ensure a thorough mixture of the resin and hardener.

    Note
    For bubble free epoxy, remove the clip separating the resin and hardener. Cut open one end of the Epoxy tube and squeeze the contents into a mixing cup. Slowly stir the mixture with the mixing stick. Be sure to stir the mixture for at least 2 minutes to ensure that all the resin and hardener have completely mixed.
  3. If needed, add color agent to the mixed epoxy. Stir slowly to prevent bubbles.
  4. Apply or use as needed. (See Figure 2)
  5. Cure the epoxy for 24 hours at room temperature or 1 hour @ 165F (74C)
Evaluation
  1. Visual examination of epoxy for texture and color match.
  2. Testing of epoxy surface for complete cure.
  3. Electrical tests as applicable.
Procedure for reference only.
 

Related Products

115-1322 Circuit Bond Kit
Kit containing packages of clear, low viscosity, superior strength epoxy for circuit board damage repair.
Color Agents
One part, air-drying, semi-paste ink for printing on hard surfaces and used to tint the color of epoxy.
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Circuitry/PTH Repair on Multilayer PCBs
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