I've always used a max temp of 110 C as a topside board temp.
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Subject: [TN] Maximum FR4 operating temperature
I have an application with a maximum ambient temperature of 70 °C. I am
using copper planes on FR4 to help cool some power resistor leads. The
copper planes can hit 115 °C. Is this a problem? Is there a rule of thumb
on how hot FR4 can continuously be operated at?