The division is divided from bottom to high according to the level level:

94HB-94VO-22F-CEM-CEM-3-FR-4

The detailed introduction is as follows:

94HB: Ordinary cardboard, non -fire prevention (gear material, module pores, you cannot do power boards)

94V0: Flame retardant cardboard (mold rush holes)

22F: single -sided half glass fiber plate (mixing hole)

CEM-1: Single-sided glass fiber plate (must be drilled by the computer, you cannot mix)

CEM-3: Double-sided semi-glass fiber plate (except for double-sided cardboard, which belongs to the material of double-sided board, simple

This material can be used for double panels, which will be 5 ~ 10 yuan/square meter cheaper than FR-4)

FR-4: Double-sided glass fiber board

The circuit board must be flamored, and it cannot be burned at a certain temperature. It can only be softened. At this time, the temperature point is called the glass conversion temperature (T). This value is related to the size stability of the PCB board.

What is the high TG PCB circuit board and the advantages of using the high TG PCB high TG printing board When the temperature rises to a certain area, the substrate will be transformed from "glass state" to "rubber state". This

The temperature is called the glass temperature (TG) of the board. In other words, TG is the temperature that maintains rigidity (℃). In other words, ordinary PCB substrate materials not only produce softening, deformation, melting and other phenomena at high temperatures, but also reflected in the sharp decline in mechanical and electrical characteristics (I don't want everyone to see the classification of PCB boards. .