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What is fr4 circuit board material? from wisepowder's blog

We’ve all heard that the abbreviation FR4 will be thrown out when we buy a PCB wafer factory, but what does this actually mean? What is the effect of choosing PCB material? This article will help eliminate fog and introduce some popular materials for rigid pcb.To get more news about fr4 circuit board, you can visit pcbmake official website.

It is very likely that you have already considered FR4 a standard option for small batch or prototype PCBs, such as in seeed fusion. FR-4 is the code of refractory grade, which means that the resin material must be able to self extinguish after combustion. It is not a material name, but a material grade. For example, it has many subgroups of tgs-130.

The FR4 option on the PCB order page is the grade name of epoxy glass fiber, which usually forms the PCB core and prepreg layer. It is this fundamental characteristic that provides PCB with the electrical insulation and mechanical strength required to withstand increasingly demanding applications. In a typical PCB, the core provides rigidity and foundation on which PCB traces can be printed. In addition, the FR4 core and the laminate form an electrical insulation layer to separate the copper layer.

For double-layer boards, the FR4 core separates the top and bottom copper layers, while for Multilayer PCB, an additional FR4 prepreg layer is sandwiched between the inner core and the outer copper layer. The desired final PCB thickness can be controlled by mixing different laminate thicknesses. This arrangement is called stacking. For example, a typical 4-ply plate with a thickness of 1.6 mm can have a core of 1.2 mm. Two sheets of 0.12 mm prepreg covered with copper, solder mask and silk screen, accounting for about 1.6 mm. To build a 1.2 mm plate, replace the core with a 0.8 mm thick core.

The core is actually made up of a copper covered substrate, so it is also called a copper clad laminate. The specified core thickness usually does not include copper. To accommodate different final copper thicknesses (e.g., 1 oz, 2 oz, etc.), cores with different plating thicknesses (e.g., 1.5 oz copper weight) can be purchased. After plating, they will stack up to 2 ounces of plates.


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