6

BFPC material composition (Recommended specifications)

Surface treatment

Copper foil

Base adhesive

Base film

Reinforcement material adhesive

Stiffener film

1.Single-Sided FPC

Name of material

Material property

2.Double-Sided FPC

3.Additional notes on FPC

Cover lay film

Cover adhesive

Surface treatment

Through-hole copper plating

Copper foil

Base adhesive

Base film

Base adhesive

1. The FPC material composition is to be used as a reference example. Please make sure that the thickness of the FPC

mating area is 0.2± 0.03 mm as previously referred to in the product specification section.

2. Please contact the FPC manufacturer for the details on its material composition.

*When using Double-Sided FPC, the copper foil on the back side of the FPC should be eliminated. This is to prevent any unintentional

unlocking due to bent or deformed FPC.

Cover lay film

Cover adhesive

Polyimide 1 mil

Copper foil

Cover adhesive

Cover lay film

Reinforcement material adhesive

Stiffener film

Cu

½ oz

Thermoset adhesive

Polyimide

1 mil

Thermoset adhesive

Polyimide

1 mil

Total

（18）

25

25

25

25

197

3

35

25

25

40

75

203

Thickness (µm)

（25）

（25）

Polyimide

1 mil

Nickel undercoat 1 to 5 µm+

Gold plating 0.2 µm

Cu

Cu

½ oz

Thermoset adhesive

Polyimide

1 mil

Thermoset adhesive

（25）

（25）

3

15

18

18

25

18

Name of material

Material property

Thickness (µm)

Nickel undercoat 1 to 5µm+

Gold plating 0.2µm

Cu

1 oz

Heat hardened adhesive

Polyimide

1 mil

Heat hardened adhesive

Polyimide

3 mil

Total