How to stop fisheyes creating a fail in your conformal coating process

fisheye defects found on a conformal coated circuit board
Fish eyes formed due to contamination on the circuit

In coating, a fish eye is a localised de-wetting defect.

It looks like a fish eye crater on the surface of the conformal coating.

Causes of fish eye defects in conformal coating

Fish eyes are normally caused by a contaminant on the surface prior to application of the conformal coating.

This contaminant is a substance like a silicon residue.

When coating is applied on top of the contaminant, the conformal coating is unable to adhere to the oily surface and a “fish eye” is caused.

Click to find out how to stop fish eye defects in conformal coating.


Author: nexus3c

A global resource for the Conformal Coating industry providing information, solutions, connections and advice on all areas of Conformal Coating including Conformal Coating Service, Equipment, Materials, Training, Documentation and Consultancy.

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