Rigid copper clad laminate is made of glass fibre cloth as supporting material. It is coated with glue for glass fibre cloth by dipping glue and dried into semi-cured sheet by oven. Then it is sheared according to certain size, designed by different proportion and thickness, and added on the upper and lower surfaces of the bonded sheet. Copper foil is applied and pressed in high temperature and high pressure press. Thus the semi-curable sheet is completely cured to form a copper clad sheet. Flexible copper clad laminate is covered by fiberglass cloth. It is directly coated with glue on a PI film and copper foil on the other side. This is the difference in their processing technology.

Rigid copper clad sheet is called CCL (Copper Cald Laminate), and flexible copper clad sheet is called FCCL (Flexibility Copper Cald Laminate).

There is no distinction between who is more advanced, because the two kinds of copper clad laminates are used in different fields. Generally, rigid copper clad laminates are divided into CEM-1, CEM-3 (paper-based copper clad laminate) and FR-4 (glass fiber cloth-based copper clad laminate). CEM series is used in low-end products such as household appliances and electrical appliances. FR-4 will have a broader range of applications, such as automobile, computer, mobile phone, military, aerospace, communications and many other electronic industries. FCCL is generally only used in soft links, such as wires and cables, mobile phone links and so on.

China's copper clad laminate began to develop rapidly around 1980. At that time, the rise of electronic toys and small household appliances led to the upsurge of China's copper clad laminate industry. Developed to 2002, China's copper clad laminate industry is moving towards high-tech technology, halogen-free, lead-free, high TG, high thermal conductivity, high-frequency and high-speed product concept is injected into the copper clad laminate industry at all times.

The future development will be chips packaging, high thermal conductivity LED, high-frequency and high-speed communications industry.

In fact, the copper clad laminate industry is a forgotten technological force. Only by improving the processing performance of copper clad laminate materials, the performance of product circuit boards can be improved, which will lead to the improvement of product performance. Seeing that there are few such problems in Baidu, in fact, the state should pay more attention to them.