There are many kinds of PCB boards, and the specifications of each pcb board are different, and their materials, prices, parameters are also different. We can better distinguish the materials, prices and parameters of each specification by understanding the specifications of pcb boards to facilitate the later selection of materials.
Divided by grade level from bottom to high as follows:
94HB, 94VO, 22F, CEM-1, CEM-3, FR-4
The details are as follows:
94HB: Ordinary cardboard, not fireproof (the lowest grade material, die punching, can not be used as a power supply board).
94V0: Flame-retardant cardboard (punched by die).
22F: Single-sided half glass fiber board (die punching).
CEM-1: Single-sided fiberglass board (computer drilling is necessary, not die punching).
CEM-3: Double-sided semi-glass fiber board (except for double-sided cardboard, it is the lowest-end material of double-sided board. Simple double-sided board can use this material, which is 5~10 yuan/square meter cheaper than FR-4).
FR-4: Double-sided fiberglass board.
1. The grade of flame retardant properties can be divided into 94V-0, V-1, V-2, 94-HB.
2. Semi-Cured Film: 1080=0.0712mm, 2116=0.1143mm, 7628=0.1778mm.
3. FR4 CEM-3 is a plate, fr4 is a glass fiber board, cem3 is a composite substrate.
4. Halogen-free refers to the base material that does not contain halogen (fluorine, bromine, iodine and other elements), because bromine will produce toxic gas when burned, which requires environmental protection.
6. Tg is the glass transition temperature, that is, the melting point.
The circuit board must be flame-resistant, cannot burn at a certain temperature, but can only be softened. The temperature point at this time is called the glass transition temperature (Tg point), and this value is related to the dimensional stability of the PCB board.
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