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Conformal coating is a protective, breathable coating of thin polymeric film applied to printed circuit boards (PCBs). Conformal coatings are typically applied with 25–250 μm [ 1 ] thickness on electronic circuitry to protect against moisture and other substances.
Coatings of parylene are often applied to electronic circuits and other equipment as electrical insulation, moisture barriers, or protection against corrosion and chemical attack (conformal coating). They are also used to reduce friction and in medicine to prevent adverse reactions to implanted devices .
Conformal coating gives most of the benefits of potting, and is lighter and easier to inspect, test, and repair. Conformal coatings can be applied as liquid or condensed from a vapor phase. When potting a circuit board that uses surface-mount technology , low glass transition temperature (T g ) potting compounds such as polyurethane or silicone ...
Another technique for applying a conformal coating is for plastic to be sputtered onto the PCB in a vacuum chamber. The chief disadvantage of conformal coatings is that servicing of the board is rendered extremely difficult. [30] Many assembled PCBs are static sensitive, and therefore they must be placed in antistatic bags during transport.
Pages in category "Coatings" ... Conformal coating; Conversion coating; Curtain coating; D. Detonation spraying; Diamond-like carbon; Dimethylolpropionic acid;
There has been recent development in utilizing FOS testing for porosity of conformal coatings. [7] Nominally 1 square centimeter silver coupon cleaned per ASTM B810-01a (Reapproved 2017) Cleaning Method I. The material under test is suspended inside a container over a source of powdered sulfur. The powdered sulfur is placed in a dish.
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