Kapton® FN FEP-Coated / Laminated Polyimide Film
Kapton® FN is a general purpose Kapton® HN film coated or laminated on one or both sides with FEP fluoropolymer, with ultimate tensile strength of 162–207 MPa (23,500–30,000 psi) at 23°C depending on construction. The FEP layer imparts heat sealability, a moisture barrier, and enhanced chemical resistance not achievable with uncoated Kapton® films. It is available in multiple constructions per general specification QE-10167.
Key Properties
- Tensile Strength at 23°C: 120FN616: 207 MPa (30,000 psi); 150FN019: 162 MPa (23,500 psi); 250FN029: 200 MPa (29,000 psi) — ASTM D882, Method A
- Elongation at 23°C: 120FN616: 75%; 150FN019: 70%; 250FN029: 85% — ASTM D882
- Dielectric Strength: 120FN616: 272 V/µm (6,900 V/mil); 150FN019: 197 V/µm (5,000 V/mil); 250FN029: 197 V/µm (5,000 V/mil) — ASTM D149
- Key Performance Feature: Heat sealable; moisture barrier; enhanced chemical resistance
- Available Constructions: 120FN616, 150FN019, 250FN029 (per specification QE-10167)
- Density: 120FN616: 1.53 g/cc; 150FN019: 1.67 g/cc; 250FN029: 1.57 g/cc — ASTM D1505
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Physical Properties
| Property | 120FN616 | 150FN019 | 250FN029 | Test Method |
| Ultimate Tensile Strength at 23°C, MPa (psi) | 207 (30,000) | 162 (23,500) | 200 (29,000) | ASTM D882, Method A |
| Ultimate Tensile Strength at 200°C, MPa (psi) | 121 (17,500) | 89 (13,000) | 115 (17,000) | ASTM D882, Method A |
| Yield Point at 3% (23°C), MPa (psi) | 61 (9,000) | 49 (7,000) | 58 (8,500) | ASTM D882 |
| Yield Point at 3% (200°C), MPa (psi) | 42 (6,000) | 43 (6,000) | 36 (5,000) | ASTM D882 |
| Stress at 5% Elongation (23°C), MPa (psi) | 79 (11,500) | 65 (9,500) | 76 (11,000) | ASTM D882 |
| Stress at 5% Elongation (200°C), MPa (psi) | 53 (8,000) | 41 (6,000) | 48 (7,000) | ASTM D882 |
| Ultimate Elongation at 23°C, % | 75 | 70 | 85 | ASTM D882 |
| Ultimate Elongation at 200°C, % | 80 | 75 | 110 | ASTM D882 |
| Tensile Modulus at 23°C, GPa (psi) | 2.48 (360,000) | 2.28 (330,000) | 2.62 (380,000) | ASTM D882 |
| Tensile Modulus at 200°C, GPa (psi) | 1.62 (235,000) | 1.14 (165,000) | 1.38 (200,000) | ASTM D882 |
| Impact Strength at 23°C, N·cm (ft·lb) | 78 (0.58) | 68.6 (0.51) | 156.8 (1.16) | Qnity Pneumatic Impact Test |
| Tear Strength, initial Graves, N (lbf) | 1.8 (2.6) | 1.5 (2.6) | 17.8 (4.0) | ASTM D1004 |
| Tear Strength, propagating Elmendorf, N | 7.2 | 16.3 | 26.3 | ASTM D1922 |
| Density, g/cc (g/mL) | 1.53 | 1.67 | 1.57 | ASTM D1505 |
Electrical Properties (at 23°C / 73°F, 50% RH)
| Property | 120FN616 | 150FN019 | 250FN029 | Test Method |
| Dielectric Strength, V/µm (V/mil) | 272 (6,900) | 197 (5,000) | 197 (5,000) | ASTM D149 |
| Dielectric Constant | 3.1 | 2.7 | 3.0 | ASTM D150 |
| Dissipation Factor | 0.0015 | 0.0013 | 0.0013 | ASTM D150 |
| Volume Resistivity at 23°C, Ω·cm | 1.4 x 10¹⁷ | 2.3 x 10¹⁷ | 1.9 x 10¹⁷ | ASTM D257 |
| Volume Resistivity at 200°C, Ω·cm | 4.4 x 10¹⁴ | 3.6 x 10¹⁴ | 3.7 x 10¹⁴ | ASTM D257 |
Chemical Properties
| Property | 120FN616 | 150FN019 | 400FN022 | Test Method |
| Moisture Absorption at 23°C, 50% RH, % | 1.3 | 0.8 | 0.4 | ASTM D570 |
| Moisture Absorption at 23°C, 98% RH, % | 2.5 | 1.7 | 1.2 | ASTM D570 |
| Water Vapor Permeability, g/(m²·24h) | 17.5 | 9.6 | 2.4 | ASTM E96 |
| Water Vapor Permeability, g/(100 in²·24h) | 1.13 | 0.62 | 0.16 | ASTM E96 |
Note: The Chemical Properties table lists construction 400FN022, which differs from the 250FN029 construction used in the Physical and Electrical Properties tables, per the source TDS.
Compliance
- ASTM D5213 (Type 2, Item A) — Compliant
- Heat sealable insulating bags and formed tubing for high-temperature fluid and electrical systems
- Flexible heater circuits requiring a bondable, moisture-resistant insulating substrate
- Automotive diaphragm and manifold insulation where heat fusibility and chemical resistance are required
- Electrical insulation wraps and laminates requiring improved moisture barrier properties vs. uncoated polyimide
- Multi-layer constructions bonded via FEP fusion bonding at elevated temperature
Common industries: electronics, automotive, aerospace, electrical equipment manufacturing, industrial heating systems.
Kapton® FN combines the established thermal, electrical, and mechanical properties of Kapton® HN polyimide film with an FEP fluoropolymer coating or lamination applied to one or both sides. This construction makes Kapton® FN uniquely suited for applications requiring heat bondability, where the FEP layer fuses to itself or to another surface under heat and pressure. The film is recommended wherever moisture and chemical resistance beyond the capability of uncoated Kapton® films are required.
The FEP coating reduces moisture absorption and water vapor permeability compared to bare polyimide: at 50% RH the 120FN616 construction absorbs 1.3% moisture; the 250FN029 construction absorbs 0.4%. Water vapor permeability ranges from 17.5 g/(m²·24h) for the 120FN616 construction to 2.4 g/(m²·24h) for the 400FN022 construction, demonstrating that moisture barrier performance scales with FEP content.
Dielectric constant is lower than standard HN (2.7–3.1 depending on construction), and volume resistivity remains above 10¹⁴ Ω·cm even at 200°C.
Compliant with ASTM D5213 (Type 2, Item A).
What differentiates Kapton® FN from uncoated Kapton® HN?
Kapton® FN adds FEP fluoropolymer to one or both sides of a standard HN polyimide core, which introduces heat sealability, a moisture barrier, and enhanced chemical resistance — none of which are available with bare HN. The tradeoff is modestly reduced tensile strength compared to equivalent-gauge HN, and a slightly higher density due to the FEP layer.
Why does tensile strength matter for polyimide film selection?
Tensile strength affects how the film handles during tape wrapping, laminating, and forming operations, and determines whether the film can withstand the mechanical stresses of the end application. Kapton® FN retains meaningful tensile strength at 200°C (89–121 MPa depending on construction), confirming its suitability for elevated-temperature applications.
What is the service temperature range for Kapton® FN?
Kapton® FN is heat bondable and recommended for applications where a heat-fusible film or moisture and chemical resistance beyond uncoated Kapton® films is required. The FEP coating makes it heat sealable, and the polyimide core maintains the high-temperature resistance characteristic of the Kapton® family.
Is Kapton® FN suitable for regulated environments?
Kapton® FN is compliant with ASTM D5213 (Type 2, Item A). No additional compliance certifications are specified on the H-O Products TDS for this material.
How should Kapton® FN be specified?
Specify grade (Kapton® FN), construction designation (120FN616, 150FN019, 250FN029, or other per QE-10167), compliance requirements, dimensional tolerances, and finished format (slit roll, sheet, or fabricated component).
