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Conformal Coating Material and Application ‘‘State of the Industry’’ Assessment Report
Abstract
Conformal coatings are thin layers of polymers applied to the surfaces of electronic assemblies, primarily to protect the electronics from the operational environment. In most manufacturing specifications, conformal coating thickness is defined as the thickness of the final polymer film on a flat, unencumbered surface of the assembly. However, the conformal coating thickness on other assembly and component surfaces are usually uncharacterized. This report outlines an IPC study of major conformal coating types, coating application techniques, and coating cure technologies, characterizing the final film thickness on common component surfaces. The study included volunteers from numerous manufacturing companies who applied coating using vetted manufacturing processes for the production of high reliability electronics.
Overview
Conformal coating, for the purpose of this document, is defined as a thin, often transparent, polymeric coating that is applied to the surfaces of printed circuit assemblies (PCAs) to provide protection from the operational use environment. Typical coating thickness ranges from 12.5 ìm [0.49 mil] to 200 ìm [7.9 mil].
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