The difference between 3240 epoxy board and FR4 epoxy board

3240 epoxy board and FR4 epoxy board are the two most common epoxy boards currently used in the market. Everyone says FR4 is better than 3240. What is the difference between them?

Difference 1: FR4 has good flame retardant performance.

FR4 is an improved product of 3240 epoxy board. The flame retardant performance of FR4 epoxy board meets the national UL94V-0 standard. 3240 epoxy board has no flame retardant properties.

Difference 2: Translucent color.

The color of FR4 epoxy board 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 is also not in line with the country’s green sustainable development strategy. The FR4 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 five: FR4 can self-extinguish from the fire.

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

Difference six: 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 good performance, it is now a material for insulating parts in the electrical and electronic industries. Of course, 3240 epoxy board still has a certain market due to its price advantage.