What are the advantages of FR4 epoxy board?

The commonly used epoxy boards on the market are 3240 and FR-4 epoxy boards, so what is the difference between them? What are the advantages of FR4 epoxy board?

1: FR4 has good flame retardant performance

2: the color is translucent

3: FR4 is radiation-free and environmentally friendly

4: FR4 has good dimensional stability

5: FR4 can be self-extinguished from the fire

6: low water absorption

Because FR-4 epoxy board has good performance, it is now a material for insulation parts in the high-end electrical and electronic industries. Of course, 3240 epoxy board still has a certain market because of its price advantage