are Conformal Coatings?
coatings are materials applied in thin layers (typically a
few mils or a fraction of a mm) onto printed circuits or other
electronic substrates. They provide environmental and mechanical
protection to significantly extend the life of the components
and circuitry. Conformal coatings are traditionally applied
by dipping, spraying or simple flow coating, and increasingly
by select coating or robotic dispensing.
coatings protect electronic printed circuit boards from moisture
and contaminants, preventing short circuits and corrosion
of conductors and solder joints. They also minimize dendritic
growth and the electro-migration of metal between conductors.
In addition, the use of conformal coatings protects circuits
and components from abrasion and solvents. Stress relief is
also provided, as well as protection of the insulation resistance
of the circuit board.
coatings are particularly useful for protecting circuitry
in severe service environments, while maintaining a low stress
environment for components and connections. These severe conditions
range from every day temperature and humidity extremes seen
in consumer electronics, to the more harsh automotive under
hood applications, up to the extremes demanded in military
or industrial applications. They are supplied in a variety
of forms that can be cured at room temperature or very significantly
accelerated by heat.