Originally Posted by
willydstyle
As a polymer chemist I would not trust carbon that had been heated to 400F as it could increase crosslinking in the epoxy matrix and cause embrittlement.
One of our niche customer high-end specification is a resin/carbon/honeycomb matrix for the inside of engine cowlings. If the inside surface reaches anywhere near 180 deg C (356 deg F) you are flying uninsured.