Haloing - light ring around drill holes

It appears as a light ring in the base material around drill holes. In most of the cases this is a mechanically caused damage to the woven material (delamination, destruction in drill hole). Haloing is acceptable if there are no conductors close to the hole.


  • mechanical fatigue cracking through drilling, milling

Haloing, Hofbildung an Bohrung Source:
visual, optical inspection - general view
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