FR4 should never be punched, I believe
At 11:54 AM 2/17/2005, you wrote:
>Hopefully someone in the forum may have had experience with cracking
>along edge of FR4 as per attached photo. The profile of this pcb was
>punched and subsequently the edge has fine cracks through the soldermask
>and glass. We have had a large quantity of this part made in China and
>are concerned that this cracking could compromise the board function.
>
>
>
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