FR1 VS FR2 VS FR3 VS FR4

FR1 is the same as FR2. Compared to FR2 with a TG below 105, FR1 has a higher TG of 130. Some laminate manufacturers that produce FR1 may not produce FR2 because the cost and usage are similar, and both are cost-effective.
FR3 is also basically FR2. However, it uses epoxy resin adhesive instead of phenolic resin.

FR4 (FR = Flame Retardant) is a glass fiber epoxy laminate. It is the most commonly used PCB material,1.60 mm (0.062 inches). FR4 uses eight layers of glass fiber material. The maximum ambient temperature is 120-130℃, depending on the thickness.
In China, FR4 is the most widely used PCB base material, followed by FR1 and then FR2. However, FR1 and FR2 are typically applied for 1-layer PCBs because they are not beneficial for through holes. FR3 is not recommended for building multi-layer PCBs. FR4 is the best choice. FR4 is widely used because it can make single-layer to multi-layer PCBs. Using only FR4, PCB companies can manufacture a variety of PCBs, which makes management and quality control more easily, and ultimately reduces costs!

Shenzhen pcbandassembly SMT Processing: From the above analysis, it is obvious that FR4 is the best choice for producing PCBs in the market. Some materials may be cheaper, but they can only be used to make single-layer boards, and the reliability of boards made with these materials is not good. Therefore, they are only used for one-layer and simple circuit boards.