The substrate is generally classified as the insulation part of the substrate. The common raw materials are electric wood plates, glass fiber plates, and various types of plastic plates. The PCB manufacturers generally use an insulating part of glass fiber, non -fabrics, and resin, and then suppressed in epoxy resin and copper foil as "Prepreg".

　　The common substrates and main ingredients are:

　　FR-1-phenolic cotton paper, this substrate is commonly referred to as electric wooden boards (higher economy than FR-2)

　　FR-2 ─ Phenolin cotton paper,

　　FR-3-Cotton Paper, epoxy resin

　　FR-4-Woven Glass, epoxy resin

　　FR-5-glass cloth, epoxy resin

　　FR-6-f f f, polyester

　　G-10-glass cloth, epoxy resin

　　CEM-1-cotton paper, epoxy resin (flame retardant)

　　CEM-2-cotton paper, epoxy resin (non-flame retardant)

　　CEM-3-glass cloth, epoxy resin

　　CEM-4-glass cloth, epoxy resin

　　CEM-5-glass cloth, polyester

　　Ain -aluminum nitride

　　SIC -silicon carbide