[Amps] What is it called?

[Dennis Berry]

In my early days as a Model Maker, there was a dense wood-like material called Textolite (I believe that is the spelling) that was a good insulator.  You could buy it in tubes, thin or thick sheets.  It was really pretty accurate from a thickness dimension standpoint.

dennis

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There is a material that is supplied in sheets of varying
thicknesses, colored red, that makes excellent insulating 
boards. 

Does anyone know its trade name or who sells it?

Thanks,

Hal Mandel
W4HBM