Conformal coatings are materials applied in thin layers, typically a few
mils or a fraction of a mm, onto printed circuits or other electronic
substrates. These materials provide environmental and mechanical protection to
significantly extend the life of the components and circuitry. They also
minimize dendritic growth and the electromigration of metal between conductors,
as well as maintaining insulation resistance between conductive paths on the
circuits. Conformal coatings are traditionally applied by dipping, spraying or
simple flow coating, and increasingly are applied by select coating and robotic
dispensing. They are supplied in a variety of forms that can be cured at room
temperature or significantly heat
accelerated.
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If you need a
material:
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Consider
products:
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To be used in stress-sensitive applications
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With low durometer values
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With good handling properties after curing
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Designated as “tough abrasion resistant”
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For rapid processing
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With fast cure or tack-free times
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For spray coating or selective coating only on certain areas
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Use coatings with viscosities of < 500 cps or thin, higher viscosity
products with appropriate solvent thinners; RTV cure coatings are typically
used
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For dip coating
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Use coatings with viscosities of > 500 cps; heat-cure coatings are
typically used
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For good pin coverage
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With higher viscosities
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For use around heat-sensitive components that cannot withstand high cure
temperatures
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That cure at room temperature or with moderate heat
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That is not sensitive to ambient moisture and humidity during cure
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That are heat curing
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For processing where minimizing emissions is desirable
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That are solventless
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With very low levels of outgassing
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Designated as having “controlled volatility” (CV) properties
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That have been tested to common industry standards
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That have been classified by Underwriters Laboratories and/or meet military
specifications
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