What is a polyurethane conformal coating and why is it used?

Circuit board that has shorted and corroded due to chemical attack. Urethane coatings can prevent this
A circuit board that has shorted and corroded due to chemicals in the air. Urethane coatings can prevent this attack.

The Polyurethane (urethane) lacquer is part of the organic family of conformal coatings.

The urethanes are normally used for providing chemical resistance to the circuit board. as well as providing good humidity & moisture protection, and generally higher dielectric properties.

However, due to their high chemical resistance,this can be a limitation since rework and repair generally is more difficult than the acrylic coatings.

The international symbol for urethanes is UR.

UR coatings cure rather than dry. That is they cross-link by one of the many methods including solvent evaporation (initial stages), heat, UV, moisture and catalysed cure. This provides the chemical resistance for which they are generally selected.

UR coatings are available as either single or two-component formulations.

Pot life is dependent on the cure mechanism but is certainly in most cases more limited than the acrylic coatings.

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 What is a polyurethane conformal coating and why is it used?

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