How does the FR-4 PCB board works?

Forum How does the FR-4 PCB board works?

M****ves

733 0 Apr 12.2019, 11:01:59

I know FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing). "FR" stands for flame retardant, and denotes that the material complies with the standard UL94V-0. ... Grade designations for glass epoxy laminates are: G-10, G-11, FR-4, FR-5 and FR-6.

But how they work?why they are the best materials for PCB boards？