FR-4 epoxy board and 3240 epoxy board can be said to be the PK between a group of environmentally friendly products. 3240 epoxy board is a traditional product with a long history of use. The processing performance may not be so good, and it is in production. Dust that is harmful to the human body will also be produced in the passing scene; FR-4 epoxy board is firstly very environmentally friendly, and secondly there will be no delamination during the production process. The following editors introduce the differences between these two products from multiple aspects.
First of all, we distinguish FR-4 epoxy board and 3240 epoxy board by definition.
FR-4 epoxy board has the distinction between halogen-free and halogen-free. Halogen-free FR-4 is hot-pressed. The base material includes glass fiber cloth and halogen-free epoxy resin. It is impregnated with alkali-free glass fiber cloth for imported electronics Epoxy resin, a hard plate-shaped insulating material processed by hot pressing, has better performance in mechanical strength, heat resistance and other properties. The 3240 epoxy board is made of electrical grade alkali-free glass fiber cloth impregnated with epoxy resin and phenol resin, and is a hard plate-shaped insulating material processed by hot pressing.
Secondly, we briefly explain the product characteristics of FR-4 epoxy board and 3240 epoxy board
FR-4 epoxy board products have good mechanical processing performance; excellent low water absorption rate (water absorption rate is almost 0: after 24 hours of immersion, water absorption rate is only: 0.09%); Thermal shock resistance; good tensile strength, flexural strength and low temperature adaptability; no matter in high humidity or dry environment, it has good electrical properties and small loss of electrical performance, and has flame retardancy and heat resistance Sex. The 3240 epoxy board has certain electrical insulation properties.
Furthermore, it can be distinguished from the product color of FR-4 epoxy board and 3240 epoxy board
The color of the FR-4 epoxy board is natural yellow (the color of pure epoxy resin); after thermosetting, there will be some differences in color according to the time of the oven, which does not affect the performance of the product. Two 3240 epoxy boards are generally yellow.
Next we describe the characteristics of FR-4 epoxy board and 3240 epoxy board:
FR-4 epoxy board is a high-strength fiberboard with a short history. It is a new material produced with the development of the electronics industry, while 3240 epoxy board is an epoxy phenolic glass cloth laminate, which can be said to be The history of use is relatively long. From the comprehensive performance analysis of the two, the line and surface editor will describe the difference between the two:
1. The 3240 epoxy board with epoxy phenolic glass cloth laminate as the base material has low breakdown voltage and vertical layer direction electrical strength, and the insulation resistance after water immersion is relatively small;
2. When 3240 epoxy board is processed into insulating fixing parts, especially the workpiece with complicated shape, the processing surface is not handled properly, it is easy to absorb moisture and produce delamination, resulting in low voltage resistance of the parallel layer and affecting product quality. When FR-4 epoxy board is processed into insulating fixing parts, the processing surface is flat, and it is not easy to produce delamination, and the product quality is stable.
3. FR-4 epoxy board has heat resistance, continuous working temperature (in air) 150 ° C; and has flame retardant, UL 94VO level.
4. The flame retardant performance of 3240 epoxy board is very low, which can not reach UL 94VO level
5. The thickness tolerance of the 3240 epoxy board is relatively large, and it has no applicability to products with higher electronic grade requirements
6. The price of 3240 epoxy board is more advantageous than the price of FR-4 epoxy board.
At the end, it should be noted that FR-4 epoxy board products are in line with ROHS environmental protection requirements. Now they are pursuing a green and environmentally friendly development. Therefore, most logarithmic businesses generally choose FR-4 epoxy board; 3240 ring Oxygen board will produce delamination and powder during the production process, delamination is not conducive to the reprocessing and use of the product, and the powder will also cause certain harm to the human body. Now many manufacturers no longer produce this product, instead produce FR- 4 This environmentally friendly product. The epoxy breakdown voltage of FR4 is in the range of 30KV / MM.