Kapton® 100CRC Corona Resistant Polyimide Film
Kapton® 100CRC is a state-of-the-art corona resistant polyimide film with tensile strength of 33 kpsi (228 MPa) and dielectric strength of 6500 V/mil (256 kV/mm) at 1 mil thickness. Its corona resistance provides improved service life and operational efficiencies beyond conventional insulation materials under high voltage environments where partial discharge is present. The film carries UL Electrical RTI of 240°C, UL Mechanical RTI of 200°C, and a UL-94 V-0 flammability rating.
Key Properties
- Tensile Strength: 33 kpsi (228 MPa) — ASTM D882
- Elongation: 65% — ASTM D882
- Dielectric Strength: 6500 V/mil (256 kV/mm) — ASTM D149
- UL Electrical RTI / Mechanical RTI: 240°C / 200°C — UL 746B
- Thickness: 1 mil (25.4 µm) — ASTM D374
- Density: 1.55 g/cc — ASTM D1505
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Typical Value | Test Method |
| Thickness, mil (µm) | 1 (25.4) | ASTM D374 |
| Tensile Strength, kpsi (MPa) | 33 (228) | ASTM D882 |
| Elongation, % | 65 | ASTM D882 |
| Tensile Modulus, kpsi (GPa) | 520 (3.6) | ASTM D882 |
| Density, g/cc | 1.55 | ASTM D1505 |
| Yield, ft²/lb (m²/kg) | 125 (25.5) | — |
Electrical Properties
| Property | Typical Value | Test Method |
| Dielectric Strength, V/mil (kV/mm) | 6500 (256) | ASTM D149 |
| Dielectric Constant @ 1 kHz | 3.4 | ASTM D150 |
| Dissipation Factor @ 1 kHz | 0.002 | ASTM D150 |
| Volume Resistivity, ohm-cm | >10¹⁶ | ASTM D257 |
Thermal Properties
| Property | Typical Value | Test Method |
| UL Electrical RTI, °C | 240 | UL 746B |
| UL Mechanical RTI, °C | 200 | UL 746B |
Flame & Fire Performance
| Property | Typical Value | Test Method |
| Flammability | V-0 | UL-94 |
Compliance
- UL-94 — Compliant (V-0)
- UL 746B — UL Electrical RTI 240°C
- UL 746B — UL Mechanical RTI 200°C
- Ground, slot liner, and turn-to-turn insulation in AC inverter duty motors subject to corona discharge
- Magnet wire and coil insulation for rail and automotive traction motor applications
- Stator slot insulation and ground wall insulation in hydro and wind power generators
- Transformer insulation in high voltage environments where partial discharge is present
- Laminated insulation systems combining Kapton® CRC with Nomex® paper or mica for tailored electrical performance
Common industries: electric motor manufacturing, power generation, rail and automotive traction, transformer manufacturing, industrial electrical equipment.
Kapton® 100CRC is a corona resistant variant of the Kapton® polyimide film family, developed for use as an electrically insulating material in high voltage environments where the potential for corona discharge is present.
Corona discharge occurs in motor insulation systems, particularly in inverter-duty motors and other variable frequency drive applications, and causes progressive degradation that significantly shortens the service life of conventional polyimide insulation. Kapton® 100CRC is engineered to resist this degradation, providing substantially longer voltage endurance compared to standard Kapton® HN at 1250 VAC/1050Hz under ASTM D2275 test conditions.
The film can be laminated with other materials such as Nomex® paper or mica to produce tailored electrical insulation systems with a specific combination of properties.
In addition to its corona resistant performance, Kapton® 100CRC retains the full suite of physical, electrical, thermal, and chemical resistance properties expected of the Kapton® film family. Its tensile modulus of 520 kpsi (3.6 GPa) is higher than standard Kapton® HN, and its density of 1.55 g/cc reflects the modified composition. Volume resistivity exceeds 10¹⁶ ohm-cm, dielectric constant at 1 kHz is 3.4, and dissipation factor is 0.002 — all consistent with high-performance polyimide insulation requirements.
Compliant with UL-94 V-0. UL Electrical RTI 240°C and UL Mechanical RTI 200°C per UL 746B.
What differentiates Kapton® 100CRC from standard Kapton® HN?
Kapton® 100CRC is specifically engineered to resist corona discharge degradation, which standard HN is not rated for. Under ASTM D2275 testing at 1250 VAC/1050Hz (1/2 in diameter electrodes, 5th out of 9 specimens), 100CRC demonstrates substantially longer time to failure than 100HN, directly translating to longer motor and generator insulation service life in inverter-duty and high voltage applications.
Why does dielectric strength matter for corona resistant film selection?
Dielectric strength determines the maximum voltage a film can withstand before breakdown, and is a baseline requirement for any electrical insulation. At 6500 V/mil (256 kV/mm), Kapton® 100CRC meets the demanding electrical insulation requirements of high voltage motor and generator applications, while its corona resistant formulation addresses the long-term degradation from partial discharge that dielectric strength alone does not capture.
What is the service temperature rating for Kapton® 100CRC?
Kapton® 100CRC carries a UL Electrical RTI of 240°C and a UL Mechanical RTI of 200°C, both per UL 746B.
Is Kapton® 100CRC suitable for regulated environments?
Yes. Kapton® 100CRC is rated UL-94 V-0 and carries UL Electrical RTI 240°C and UL Mechanical RTI 200°C per UL 746B.
How should Kapton® 100CRC be specified?
Specify grade (Kapton® 100CRC), thickness (1 mil / 25.4 µm), compliance requirements (UL-94 V-0, UL 746B RTI ratings), lamination partners if applicable (Nomex®, mica), dimensional tolerances, and finished format (slit roll, sheet, or die-cut component).
