Insulation grade of epoxy board

What is the difference between FR-4 and 3240 epoxy board?

The 3240 and FR4 are the two most commonly used epoxy plates currently on the market. Everyone says that FR-4 epoxy board is better than 3240. What is the difference between them?

Difference 1: FR4 flame retardant performance is good.

FR4 is an improved product of 3240 epoxy board. The flame retardant performance of FR-4 epoxy board meets the national UL 94V-0 standard. 3240 epoxy board does not have flame retardant properties.

Difference 2: bright color.

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

Difference 3: FR4 has no radiation and environmental protection.

3240 epoxy board is halogen-containing. It is not environmentally friendly for the environment and the human body. It is also inconsistent with the country’s green sustainable development strategy. The FR-4 epoxy board is just the opposite.

Difference 4: FR4 has good dimensional stability.

FR4 dimensional stability is better than 3240, and during the pressing process, the FR4 thickness tolerance control is also much better than 3240, 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: water absorption is small.

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 the material of choice for insulating parts of high-end electrical and electronic industries. Of course, 3240 epoxy board has a certain market because of its price advantage.

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