There are several classification methods for copper-clad boards. By enhancing materials, can be divided into: paper-based, glass fiber cloth, composite (CEM series), multilayer substrate and base of special materials (such as ceramics, metal-core)-five. By using resin adhesive by classifying different common paper-based CCI. : Phenol-formaldehyde resin (XPc, XxxPC, FR-1, FR 12 etc), epoxy resin (FE 13), polyester resin and other types. Common epoxy-fiberglass duct CCL (FR 14, FR-5), which is currently the most widely used type of glass fiber duct.