Maybe this web page of material dielectric constants will help give you an idea.
http://www.asiinstr.com/technical/Dielectric Constants.htm
While I can't say for sure, it seems like the dielectric constant of phenol paper would be about the same as FR4 but may vary more over temperature.
http://www.asiinstr.com/technical/Dielectric Constants.htm
While I can't say for sure, it seems like the dielectric constant of phenol paper would be about the same as FR4 but may vary more over temperature.
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