Answer
CAF (Conductive Anodic Filaments) is the phenomenon of the electric conductor (e.g. copper ion) growing along with glass yarn from Anode side to Cathode side when PCB is electrically charged in the high humidity atmosphere.
There are two kinds of countermeasures which correspond to PCB material and processability separately. Those for PCB material are as follows;
(1)Reduction of impure residue
(2)Improvement of adhesion between resin and glass.
Meanwhile those of PCB processability are as follows;
(1)Elimination of crack between resin and glass
(2)Reduction of ionic matter such as desmear reagent.
In our MEGTRON-LAB, it can be evaluated until the applied voltage 2.5kV.
We show the insulation reliability evaluation result in the substrate material for automotive equipment.
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