source:Industry News release time:2022-03-08 Article author:sznbone Popular:pcb
PCB circuit board sheet introduction: According to the brand quality level from bottom to high, it is divided as follows: 94HB-94VO-CEM-1-CEM-3-FR-4
The detailed parameters and uses are as follows:
94HB: Ordinary cardboard, not fireproof (lowest material, die punched, cannot be used as power board)
94V0: Flame Retardant Cardboard (Die Punching)
22F: single-sided half glass fiber board (die punching)
CEM-1: single-sided fiberglass board (must be drilled by computer, not die punched)
CEM-3: Double-sided semi-glass fiber board (except double-sided cardboard, which is the lowest-end material for double-sided boards, simple double-sided boards can use this material, which is 5~10 yuan/square meter cheaper than FR-4)
FR-4: Double-sided fiberglass board
1. The classification of flame retardant properties can be divided into four categories: 94VO-V-1-V-2-94HB
2. Prepreg: 1080=0.0712mm, 2116=0.1143mm, 7628=0.1778mm
3. FR4 and CEM-3 are all plate, fr4 is glass fiber board, cem3 is composite substrate
4. Halogen-free refers to the base material that does not contain halogens (such as fluorine, bromine, iodine and other elements), because bromine will produce toxic gases when burning, which is environmentally friendly.
5. Tg is the glass transition temperature, i.e. the melting point.
6. The circuit board must be flame-resistant, it cannot burn at a certain temperature, it 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 durability of the PCB board.
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