What is the material to make printed circuit board?

The board material is either a paper-phenolic composite or a paper-epoxy composite. The conductive traces are copper. Boards can be made in anything from single sided to more than 30 layers of copper traces.
Many materials have been used over the years and most are suitable as long as they are insulating.
The above material is used in early PCBs also known as 'paxolin'.
Modern boards are commonly fibreglass.
Many plasics are used, but have to be chosen for their safety, if heated to reduce flamabilty and or emmisions of toxic smoke.