Cleaning under conformal coatings
Challenges in cleaning
Cleaning under an existing conformal coating is only feasible if the coating is porous, delaminated, or was applied over contaminants. Most coatings prevent access; aggressive cleaning can damage the coating and components.
Safe cleaning methods
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remove coating selectively and recoat after cleaning when defects are identified;
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use solvent vapor or UV-curable coatings remediation in specialized cases;
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inspect using cross-sectioning or X-ray to locate contaminant entrapment.
ZESTRON advises avoiding in-situ cleaning under intact coatings and provides rework-friendly coating recommendations.