Lisa Williams wrote:
>
> We received this inquiry:
>
> "I have a question I hope you will be able to help me with, that is, for
> common board materials such as FR-4, is there a known temperature
> (besides its glass transition temperature) that represents a critical
> value above which drillling will cause unacceptable hole wall quality."
>
> If you have any answers, please let me know.
>
> Lisa Williams
> IPC
> [log in to unmask]

Are you refering to the temperature of the drill bit, or the temperature
of the board?

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