FPC flexible circuit board is one of the popular circuit board types that meet the needs of flexible electronic circuits. Designed to replace traditional wiring harnesses, flexible circuit boards can meet a variety of complex electronic designs. Although the performance of a flexible PCB depends on many factors, the main material plays a key role in it. So, what are the constituent materials of Flexible printed circuit board? In the structure of the FPC flexible circuit, the materials are composed of flexible copper clad laminate (FCCL), cover film, adhesive film and so on.

Flexible copper clad laminate (FCCL): The common sheet films of flexible copper clad laminates are polyimide film (PI), polyester (PET), polyethylene naphthalate (PEN), liquid crystal display polymer ( LCP) and other polymer material plastic films. In the FPC flexible circuit board, the copper clad laminate is mainly responsible for the three levels of conductivity, insulation layer and support point.

 Cover film: It is composed of organic chemical plastic film and adhesive. The function of the cover film is to maintain the part of the electrical conductor of the flexible power circuit that has been carried out for a long time. Adhesive films have different types of sheet films and adhesives, and thin and thick specifications.

 Adhesive film: It is formed by pouring adhesive on both sides or one side of a substrate film. There are also adhesive films without a substrate without a pure adhesive layer. The adhesive films have different adhesive types and thickness specifications. Adhesive film is used for interlayer adhesion and insulation of multilayer boards.

Ordinary FPC flexible circuit boards are mainly composed of two materials: base material + cover film. Let me talk about the base material. The base material is mainly composed of PI or PET + glue + copper. PI is a polyimide insulating resin material, pcb online china which is characterized by high temperature resistance. , Good bending performance, good reliability of the products produced, more than twice the price of PET, it is the main material of FPC flexible circuit board, PET is polyester insulating resin material, the characteristics are just opposite to PI, and there are few FPC manufacturers in general use.