No. 2.4.2
Coating Replacement, Conformal Coating, Encapsulant
OUTLINE
This method is used to replace conformal coatings and encapsulants on circuit boards.
TOOLS & MATERIALS
Brushes
Color Agents
Cleaner
Epoxy
Foam Swabs
Heat Lamp
Microscope
Oven
Replacement Coating
Wipes
PROCEDURE
- Clean the area.
CAUTION
Surfaces to be coated must be thoroughly cleaned prior to coating to ensure
adequate adhesion, minimized corrosion, and optimized electrical properties.
- If needed, apply Kapton tape to outline the area where the coating
will be applied.
- If required, bake the circuit board prior to the application of the replacement
coating.
- Mix the replacement coating.
- Apply the replacement coating to the board surface as required. A brush or
foam swab may be used to apply and spread the replacement coating. (See Figure
1).
- Cure the epoxy per Procedure 2.7 Epoxy Mixing and Handling
CAUTION
Some components may be sensitive to high temperature.
EVALUATION
- Visual examination for texture, color match, adhesion and coverage.
- Electrical tests to conductors around the repaired area as applicable.
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Solutions Across the Board
TM
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Product Class: R/F/W/C
Skill Level: Intermediate
Conformance Level: High
Revision: D
Revision Date: Jan 5 1998
Repair Service Charge
Conformal Coating Required At Outlined Area
Figure 1: For large surfaces, apply the replacement coating with a foam swab to
create a texture.
Figure 2: Coating complete.
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