Epoxy sheets commonly used in the market are 3240 and FR-4 epoxy sheets, so what is the difference between them? What are the advantages of FR4 epoxy sheets?

Difference 1: FR4 has good flame retardant performance.

FR4 is an improved product of 3240 epoxy board. The flame retardancy of FR-4 epoxy board meets the national UL 94V-0 standard. 3240 epoxy board has no flame retardant properties.

Difference 2: Translucent color.

The color of FR4 is very natural, a bit jade, and the color of 3240 epoxy board is a bit blinking. It doesn't look very natural. Most of the colors are not very uniform.

Difference 3: FR4 is non-radiation and environmentally friendly.

3240 epoxy board is halogen-containing, which is not very environmentally friendly to the environment and the human body. It also does not conform to the country's green sustainable development strategy. The FR-4 epoxy board is just the opposite.

Difference 4: FR4 has good dimensional stability.

The dimensional stability of FR4 is better than that of 3240, and during the pressing process, the thickness tolerance of FR4 is also much better than that of 3240, which is more suitable for processing.

Difference 5: FR4 can self-extinguish from the fire.

FR4 can be naturally extinguished in the event of a fire.

Difference 6: low water absorption.

Its water absorption (D-24/23, plate thickness 1.6mm):≤19mg, which provides a good help for its use in wet transformers and other equipment.

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