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What Are the Main Materials of FPC Flexible Printed Circuit Board?

peter / 2020-11-09

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Introduction to FPC Material

FPC, also know as Flexible Circuit board is a highly reliable board with polyimide or polyester film as base material. It has the characteristics of high density, light weight, thin thickness and good bending.

A common FPC consists of two materials: substrate + protective film, and the base material is mainly composed of PI or PET+ glue + copper.

PI stands for the "polyimide" insulation resin material, which is characterized by high temperature resistance, good bending performance, good reliability of the products produced, and is more than twice the price of PET, which is the main FPC material.

PET stands for the "polyester" insulating resin material, which is the opposite of PI, and the general FPC factory has rarely adopted such material.

Everyone should already know about the glue and the copper, the copper is the conductor, and the glue is used to glue the copper to the FPC material: PI or the PET.

The base board which is eventually made into FPC is the substrate, it is equivalent to the base board of the PCB.

In terms of the protective film, the protective membrane is the surface insulation layer of the FPC.

A layer of insulating layer similar to PCB ink that is attached to the substrate to prevent oxidation and short circuit after the circuit is finished. It is also composed of a rubber and PI insulation layer.

FPCs are mainly used in movable or easily bent electronic products such as mobile phones, PDAs, tablets, automobiles, etc.

The Difference Between FPC Reinforcing Material FR4 And PI

They are made of hard materials for the strengthening and easy installation of the area of the soft plate in order to carry the area of the element.

FR4 is glass fiber epoxy resin composite reinforcement, low water absorption rate, good durability and good bending strength.

The price of PI (polyimide) is higher, but its resistance is better.

Hope above FPC material related information will be helpful for you to finish your flex board design!

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