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Flexible Circuit Materials

Flexible circuits have an advantage over Rigid Fr-4 circuits in that they can bend, fold, twist and wrap in extremely tight areas, over multiple times. This provides designers freedom to locate parts together, that would otherwise not fit, and thereby reduce the packaging size of their products.

The most widely used flex circuits material today is manufactured by Dupont Corporation and is called "Kapton". This polyimide film based material is resistant to heat, has dimensional stability and a low dielectric constant of 3.6. The follows are basic Kapton materials:

Kapton FPC Materials:

Dupont Coverlay
Dupont Copper Clad
Dupont Sheet Adhensive
Dupont Photo Imageable Coverlay

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There're also other companies whom make good fliexible circuit material, such as Rogers Corporation and is called "Rogers"
Roger FPC Materials
EMC Shield Material
EMC Shielding Characteristics
KEC method [0.2~1000 MHz] (PDF/117K)
TSE method [100~2000 MHz] (PDF/185K)