My experience has been that they start to discolor around 260°C. I'm sure
this varies. The board will be charcol by 350°.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of McGlaughlin, Jeffrey
> A
> Sent: Thursday, January 17, 2002 1:06 PM
> To: [log in to unmask]
> Subject: [TN] Scorching Temp for FR4
>
>
> Tech-sters
>
> Does anyone know of a reference that gives approximate temperatures for
> discoloration (scorching) of FR4 material?
> We have a scorched board and would like a ballpark figure on how
> hot it was
> before failure.
>
> Jeffrey A. McGlaughlin CID
> Sr. Designer
> Battelle Memorial Institute
> Columbus Ohio
> [log in to unmask]
>
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