What is the raw material of FPC

Flexible Circuit Board (Flexible PCB): referred to as "flexible board", also known as "flexible circuit board", also known as "flexible circuit boards, flexible circuit boards" or "flexible circuit boards, flexible circuit boards," the English is "FPC PCB" or "FPCB, Flexible and Rigid-Flex. 1, Flexible Circuit Board (Flexible Printed Circuit Board) Flexible Circuit Board (Flexible Printed Circuit Board): English Flexible Printed Circuit, abbreviation FPC, commonly known as flexible board. IPC-T-50 in the definition of flexible circuit boards is the use of flexible substrates made of single, double or multi-layer lines of printed circuit boards, can have a cover layer (soldermask), there can also be no cover layer (soldermask). GB/T2036-94 "Printed Circuit Terminology" 2.11 on the interpretation of the Flexible Printed Circuit Board (FPC) is: made of flexible substrate printed circuit boards, can be with or without a flexible cover layer. 2, just flexible printed circuit board Rigid Flex Printed Circuit: English Rigid-Flex Printed Circuit, (FPC), also known as the combination of soft and hard board. Rigid-flex printed circuit board is composed of rigid and flexible substrate selective lamination together, the structure is tight to metallization holes to form a conductive connection, each rigid-perturbed combination of printed circuit board with one or more rigid and one or more flexible areas. National standard GB/T2036-94 2.11 "Printed Circuit Terminology" on the rigid-flex printed circuit board (FPC) is explained as follows: the use of flexible substrates and in different areas with rigid substrates combined and made of printed circuit boards, in the rigid-flex combination area, flexible substrates and rigid substrate conductive graphics are usually interconnected.