PU conformal coatings for electronics

Conformal coatings are thin polymeric coatings (typically 25 to 250 micrometers) applied over complete printed circuit boards (PCBs) — over components, traces, solder — to protect them from humidity, chemical contamination, condensation, debris and electrostatic discharge. Unlike potting (which fully encapsulates the component in a solid mass), conformal coating forms a thin film that "envelopes" the PCB while maintaining access to components for repair. PU is one of the four main families (along with acrylic, silicone and epoxy), offering a unique combination of flexibility (absorbs mechanical and thermal stress), good chemical resistance, and ease of repair (can be locally removed for rework). Typical applications: automotive electronics, industrial electronics, equipment exposed to outdoor environments, medical electronics, aerospace equipment. Growing with PCB adoption in increasingly severe applications (EVs, industrial IoT, 5G).