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Coating parts is optional for those components that require a higher dielectric resistance, resistance to chipping, or a smooth winding surface.

Parylene coating

Fair-Rite offers Parylene coating for select parts. This colorless conformal coating is used on smaller parts due to its higher cost but minimal coating thickness. Fair-Rite currently uses Paralyne-C material:

Property Value
Dielectric Strength 5600 V/mil
Volume Resistivity 8.8 x 1016 ohm-cm
Surface Resistivity 1014 ohm
Dielectric Constant (1 MHz) 2.95
Dissipation Factor (1 MHz) 0.013
Density 1.29 g/cm3
Water Absorption (24 hours) < 0.1%
Coefficient of Friction 0.29
Continuous Operating Temperature <100°C
Thermal Conductivity 2.0 x 10-4 cal/sec/cm/°C
Maximum Operating Temperature <160°C

Thermo Set Plastic coating

Fair-Rite also offers the ability to coat parts with epoxy. Due to the minimum coating thickness of 0.005”, this method is reserved for parts that are larger in size (diameters > 9mm).

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