Improved Condensation Testing to Evaluate Protection Performance of Conformal Coatings Under Different Condensation LevelsAuthors: Martin Wickham and Ling Zou
Company: National Physical Laboratory
Date Published: 10/14/2018 Conference: SMTA International
Conformal coatings have been widely used to protect electric circuits from harsh service environments, particularly under high humidity and condensation conditions. In this work, special designed assemblies have been coated by industry partners using different conformal coatings and processes. The test vehicles were assembled with a range of components and different solder pastes. A newly developed condensation approach with Surface Insulation Resistance (SIR) measurement was used to evaluate protection performance of the different coatings on the assemblies. A short term test methodology using three increasing levels of condensation over a 24 hour period, has been demonstrated to be successful in discriminating the condensation protection performances of different coatings. Coating protection strongly depends on component types and coating coverage. Coatings provide different levels of protection for different component types due to the coverage.
Surface Insulation Resistance, Condensation, Coatings
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