Phenolic X is a dielectric material, mechanically stable thermoset resin with a paper binder ... Used for tooling boards when setting up the production of PCBs. Perfect for stable, Used for very sturdy, strong table tops on cnc routers and manufacturing work surfaces.

Phenolic grade XX is a dielectric material with a paper binder compressed with heat and pressure.  Grade XX Paper Phenolic is a high pressure laminate used for general purpose electrictronics. Grade XX Phenolic can also be used for spools, buss bars and high voltage covers.

Phenolic XXX is a dielectric material, mechanically stable paper based, laminate.  Awesome performance in electrical insulating applications.