FR4 classification

The surface color of FR-4 epoxy glass cloth laminate is as follows:
Yellow FR-4, white FR-4, black FR-4, blue FR-4, etc.
FR-4 is the base plate used by PCB, and it is a kind of sheet metal. According to the different reinforcing materials, sheets are mainly classified into the following four types:
1) FR-4: Glass Cloth Substrate
2) FR-1, FR-2, etc.: Paper Substrate
3) CEM Series: Composite Substrate
4) FR-4 of special material substrates (ceramics, metal substrates, etc.) is a plate-like laminated product made of epoxy phenolic resin and other materials impregnated with special electronic cloth by hot pressing at high temperature and pressure.
Features: It has high mechanical and dielectric properties, good heat and moisture resistance and good machinability.
Usage: Used as insulating structural parts in motor and electrical equipment, including various types of switch FPC reinforcing electrical insulation carbon film printed circuit board, computer drilling cushion die fixture (PCB test stand), and can be used in humid environment and transformer oil.
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