What is the difference between FR4 epoxy fiberglass board and 3240 epoxy fiberglass board?

The domestic epoxy fiberglass board is usually 3240, and FR4 epoxy fiberglass board is generally imported insulation board. But both are very different things from physical properties or chemical properties. Let me introduce it to everyone briefly:

1, 3240 epoxy glass fiber board, general full name: 3240 epoxy phenolic fiberglass cloth laminate. It uses epoxy resin glue and phenolic material as curing agent. The temperature is usually 155 degrees. Better machining performance. It is also very suitable for transformers and transformer oil. The density generally does not exceed the national standard: 1.9.

However, many domestic manufacturers now participate in fillers, such as talcum powder, in order to save costs in the production process. Their density has increased dramatically. It also greatly reduces electrical performance. It is only suitable for general insulation projects.

2. FR4 epoxy glass fiber board. Epoxy glue is used. But it is not a curing agent with phenolic materials. Purely cured at high temperature. It is compared with plastic pure. The temperature is usually greater than 180 degrees. The machining performance is very strong. A colleague once joked that cutting with a cutting machine cuts sparks.

shows its processing performance. And it will not crack or delaminate when used. The electrical performance is very strong. It is suitable for electronic circuit boards and copper clad laminates. The base material may also be all fine cloth. Electronic fiber cloth. It is usually a density of 1.85. Resistant to chemical corrosion.

3240 epoxy fiberglass board and FR4 epoxy fiberglass board are the two most common epoxy fiberglass boards currently on 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 glass fiber board. The flame retardant performance of FR4 epoxy glass fiber board meets the national UL94V-0 standard. 3240 epoxy glass fiber 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 fiberglass board is a bit blinking. It doesn’t look very natural. Most of the colors are not very uniform.

Difference three: FR4 has no radiation and is environmentally friendly.

3240 epoxy glass fiber 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 glass fiber board is just the opposite.

Difference 4: FR4 has good dimensional stability.

FR4 has better dimensional stability than 3240, and during the pressing process, the thickness tolerance of FR4 is also much better than 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 glass fiber board has very good performance, it is now used as a material for insulating parts in the electrical and electronic industries. Of course, 3240 epoxy fiberglass board still has a certain market due to its price advantage.