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Kapton® 140EN‑Z polyimide film is a premium‑performance polyimide film engineered for use as dielectric substrates in chip‑on‑film (COF), flexible printed circuits, and high‑density interconnects. These films are specifically designed for applications where surface quality, dimensional stability, and coefficient of thermal expansion control are critical, making them well suited for very fine‑pitch circuitry and next‑generation integrated circuit (IC) packaging.
| Property Group | Property Name | Value | Test Method |
|---|---|---|---|
| Appearance | Color | Amber | |
| Classification | Functional Film Type | Enhanced electrical film for COF | |
| Electrical | UL Electrical RTI (°C) | 240 | UL 746B |
| Mechanical | UL Mechanical Strength RTI (°C) | 200 | UL 746B |
| Regulatory | UL Flammability Rating | V-0 | UL-94 |
| Property Name | Thickness (μm) | Elongation % to Break @23°C | Dielectric Strength (kV/mm) | CTE (50-200 °C) (ppm/°C) | Tensile Strength @23°C (MPa) | Tensile Modulus @23°C (GPa) |
|---|---|---|---|---|---|---|
| Test Method | ASTM D5470 | ASTM D882 | ASTM D149 | JIS-K 7197 | ASTM D882 | ASTM D882 |
| Kapton® 140EN-Z | 35.6 | 70 | 430 | 7 | 385.0 | 6.90 |