Equivalent Material for Laminated Plastic Sheet NEMA Grade C

Grade C and XX are paper reinforced phenolic resin sheets.

Thomasnet will give you plenty suppliers

http://www.thomasnet.com/southern-california/plastic-laminates-nema-grade-96099569-1.html

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Actually Grade C is cotton/phenolic resin, XX is paper.

Why not come into the 21st century and use FR4/5 or G 10/11?

Mil-I-24768 Type PBG

and Mil-I-24768 Type FBM

And IEC 61212-3-1 PF CP 23

and IEC 61212-3-1 PF CC 22

Are some equivalents. You can figure it out from there, hopefully, maybe.

It's a simple matter of using a little intelligence.