Flexible copper clad laminate is one-sided flexible copper clad laminate or two-sided flexible copper clad laminate, which is based on PI film or polyester film and covered with thin copper foil conductor to meet the flexibility requirements. Compared with rigid copper clad laminates, flexible copper clad laminates are light, thin and flexible, so FPC based on flexible copper clad laminates is widely used in mobile phones, digital cameras, automotive satellite orientation devices, LCD TV, notebook computers and other electronic products.

Flexible copper clad laminates can be traced back to 1898 patents on the use of paraffin paper substrates to fabricate planar conductors. In 1960, American engineers took the lead in forming circuit patterns on flexible circuit boards by applying metal foils to thermoplastic films and etching them. After nearly half a century of development, flexible copper clad laminates have been used more and more widely, and have become an indispensable part of consumer electronic products such as tablets, mobile phones and so on. Flexible copper clad laminates have been developed in China since 1980s. From two kinds of three-layer flexible copper clad laminates (3L-FCCL) developed by the original 704 State-owned Plant in 1987, to the flexible copper clad laminates produced by Hubei Institute of Chemistry, which witnessed the rapid development of industrialization of flexible copper clad laminates in China. Up to now, China's total capacity of flexible copper clad laminates has exceeded 108 m2, ranking among the world's largest producers of copper clad laminates.