The surface colors of FR-4 epoxy glass cloth laminates are:
Yellow FR-4, white FR-4, black FR-4, blue FR-4, and the like.
The FR-4 is the substrate used by the PCB and is a category of sheets. The sheets are classified into the following four types, depending on the reinforcing material:
1) FR-4: Glass cloth substrate
2) FR-1, FR-2, etc.: Paper substrate
3) CEM Series: Composite Substrate
4) Special material substrates (ceramics, metal bases, etc.) FR-4 is a plate-like laminated product made of a special electronic cloth impregnated with epoxy phenolic resin and other materials that are hot pressed under high temperature and high pressure.
Features: High mechanical properties and dielectric properties, good heat resistance and moisture resistance, and good machinability.
Uses: Insulating structural parts for motors and electrical equipment, including various types of switches, FPC-reinforced electrical insulation carbon film printed circuit boards, computerized drilling mat mold fixtures (PCB test racks), and in wet conditions and Used in transformer oil.