FR4 PCBs are printed circuit boards made with FR4 material that is one of the most popular materials used in the PCB fabrication and assembly. FR4 PCB is a printed circuit board that essentially uses the FR4 sheets and widely used for many applications.
FR stands for Fire Retardant. FR4 is a glass fiber epoxy laminate. It is the most commonly used PCB material. FR4 uses 8 layers glass fiber material. The maximum ambient temperature is between 120°C and 130°C, depending on thickness. All these fr4 material properties make FR4 printed circuit boards popular among electronic contract manufacturers.
FR4 is the most widely used PCB base matertial, next is FR1 then FR2. But FR1 and FR2 are usually used for single layer pcb because they are not good for passing through holes. FR3 is not recommended to building multi-layer pcbs. FR4 is the best selection. FR4 is widely used because it is good to make from one layer to multi-layer pcbs. With only FR4, PCB companies can make all kinds of pcbs, which leaves the management and quality control much easier and eventually it can reduce the cost.
Standard FR4: as its name indicates, this is the standard FR-4 with heat resistance of the order of 140°C to 150°C.
High TG FR4: this type of FR-4 has higher glass transition (TG) of around 180°C.
High CTI FR4: Comparative Tracking Index higher than 600 Volts.
FR4 with no laminated copper: ideal for insulation plates and board supports.
High Glass Transition Temperature (Tg) (>=170Tg)
Arc Resistance (>=60S)
Dielectric Breakdown (KV): >=40
Dielectric Constant (@1 MHz): <=5.4
Dissipation Factor (@ 1 MHz): <=0.035
High Decomposition Temperature (Td) (> 340º C)
Flexural Strength (Mpa): >=415
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