Foshan FPC soft plate dielectric constant

When the medium is applied with an electric field, it will generate an induced charge and weaken the electric field. The ratio of the original external electric field (in vacuum) to the electric field in the final medium is the permittivity, also known as the inductance, which is related to frequency. The dielectric constant is also called the dielectric constant. So what is the dielectric constant of FPC soft plate,

Dielectric constant of flexible plate:

As FPC materials are divided into two types, Polyimide and Polyester, we will separate them here.

1. Polyester (Polyester)

Polyester is made of polyethylene terephthalate(SHORT for PET). The thickness range of flexible plate is generally 25μm(1mil) ~ 125μm(5mil). It has the same excellent flexibility and electrical properties as Polyimide.

However, its dimensional stability during the manufacturing process is slightly less than that of Polyimide. In addition, it has poor tear resistance and is more sensitive to welding temperature. Its dielectric constant is 3.4.

2. Polyimide

Polyimide (PI for short) is the most commonly used thermal curing insulating material in flexible circuit machining. The thickness range of materials is generally 12.5μm(0.5mil) and 125μm(5mil). It is divided into adhesive and non-adhesive. The permittivity of adhesive is 3.5, and that of non-adhesive is 3.3.