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Silicones from Dow Corning
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Conformal Coatings

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Conformal Coatings Tutorial-Options

Conformal Coatings Options

For conformal coatings, the most competitive options are materials based on: acrylics, epoxies, urethanes, parxylenes or silicones.

Spray Coater


Acrylic coatings are typically solvent based and are easily repaired. Traditionally they were low cost but have become less competitive with rising regulation requirements and safety concerns with solvent usage. They were tough, hard, and transparent - but lacked stress relieving capability. Pot life was good since additional solvent could be added to keep the bath viscosity low and they exhibited low moisture absorption and had short drying times when volatile solvents were used.



Epoxy coatings are very hard, usually opaque and are good at resisting the effects of moisture. They possess excellent chemical and abrasion resistance, but can cause stress on components during thermal extremes. Cure chemistries can sometimes require extra precaution for safe handling. Fluctuating temperatures can cause considerable drift in viscosities and difficulties in controlling cure times and coating thicknesses.



Urethane coatings are tough, hard and exhibit excellent resistance to solvents. Along with excellent abrasion resistance and low moisture permeability, they offer good low temperature flexibility.

Their use is often prevented by their limited high-temperature capability and lack of repairability.



Paraxylylene coatings are very uniform and yield excellent pin coverage. Their limitations include high cost, sensitivity to contaminants and the need for vacuum application technique.



Silicone coatings range from elastoplastic (tough, abrasion-resistant) to soft, elastomeric (stress-relieving) materials.

They possess the following characteristics:

Heat cure or RTV cure
Usefulness over a very wide temperature range
Good moisture and humidity resistance
Processing versatility
Easy repairability
Low toxicity


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< back to Conformal Coatings Home Page  
  1. Conformal Coatings Tutorial - What are Conformal Coatings?

  2. Conformal Coatings Tutorial-Options

  3. Key Conformal Coating Characteristics

  4. Conformal Coatings Product Families

  5. Comparison of Product Families

  6. Processing Options

  7. Curing Methods

  8. Packaging and Storage Considerations

  9. Repairability and Component Replacement

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