Single-sided circuit board generally have those types, and how to separate?
According to the grade level from bottom to top are as follows: 94HB/94VO/22F/CEM-1/CEM-3/FR-4
Circuit board must be resistant to combustion, can not burn at a certain temperature, can only soften. At this point, the temperature is called the glass transition temperature (Tg), which is related to the size of the PCB plate stability.
Details are as follows: 94HB: ordinary cardboard, not fire (the most low-grade materials, die punch, can not do power board). 94V0: flame retardant paper board. 22F: single side half glass fiber board (die punching). CEM-1: single side glass fiber board (must be computer drilling, can not punch). CEM-3: double sided glass fiber board (in addition to the double sided board is the lowest side of the plate material, a simple double-sided board can use this material, cheaper than FR-4 will be 5~10 yuan / square meter). FR-4: double glass fiber board.
