– woven/non-woven fabric;
– organic or glass fiber;
– polytetrafluoroethylene threads- PTFE;
– various resins (phenolic, polyester, epoxy, polymeric, etc.) and their mixtures - multifunctional, mixed, etc.;
– hardeners - dicyandiamide, phenol-formaldehyde resin, isocyanurate and cresol novolac, p-aminophenol, etc.;
– powdered organic/ceramic fillers.
The basic materials can be both flexible and rigid. There are also liquid (pasty) bases of printed circuit boards. Let us consider types of dielectric bases according to the NEMA classification more detailed: