APTIV™ XPI A108
APTIV™ XPI A108 is an unfilled, semi-crystalline film manufactured from VICTREX™ PEEK polymer, available at 200 µm with a density of 1.30 g/cm³, engineered for high-voltage e-motor stator slot liner applications at 800 V and above. It delivers the highest breakdown voltage in the XPI A-series at 25.9 kV (23°C), a partial discharge inception voltage of 1526 V at 23°C, and a Relative Thermal Index (Electrical) of 240°C per UL 746B. The film provides outstanding resistance to water, ATF, oils, and cooling fluids, supporting all cooling concepts from water-based systems to direct oil immersion.
Key Properties
- Tensile Stress, MD: 23°C, 200 µm: 110 MPa (ISO 527)
- Tensile Elongation, MD: 23°C, 200 µm: >150 % (ISO 527)
- Breakdown Voltage 1 kV/s (23°C): 25.9 kV (ASTM D149)
- Dielectric Constant (23°C) 1 kHz: 3.20 (IEC 60250)
- Film Thickness — Recommended/Available: 200 µm
- Density Crystalline (23°C): 1.30 g/cm³ (ISO 1183)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Density Crystalline (23°C) | 1.30 g/cm³ | ISO 1183 |
| Water Absorption, Equilibrium, 23°C, 0.0500 mm, 50% RH | 0.040 % | ISO 62 |
| Shrinkage MD TM-VX-84 (200°C, 50.0 µm) | <0.50 % | — |
| Shrinkage TD TM-VX-84 (200°C, 50.0 µm) | <0.50 % | — |
Mechanical Properties
| Property | Value | Test Method |
| Film Thickness — Recommended/Available | 200 µm | — |
| Tensile Modulus, MD: 23°C, 200 µm | 2300 MPa | ISO 527 |
| Tensile Modulus, TD: 23°C, 200 µm | 2300 MPa | ISO 527 |
| Tensile Stress, MD: 23°C, 200 µm | 110 MPa | ISO 527 |
| Tensile Stress, TD: 23°C, 200 µm | 110 MPa | ISO 527 |
| Tensile Elongation, MD: 23°C, 200 µm | >150 % | ISO 527 |
| Tensile Elongation, TD: 23°C, 200 µm | >150 % | ISO 527 |
Thermal Properties
| Property | Value | Test Method |
| Glass Transition Temperature (Onset) | 143 °C | ISO 11357 |
| Melting Temperature | 343 °C | ISO 11357 |
| CLTE — Flow below Tg (0.0500 mm) | 3.5E-5 cm/cm/°C | ASTM D696 |
| Thermal Conductivity Through Plane | 0.25 W/m/K | ASTM E1461 |
| RTI Elec | 240 °C | UL 746B |
Electrical Properties
| Property | Value | Test Method |
| Volume Resistivity (23°C) | 1.0E+16 ohms•cm | IEC 60093 |
| Comparative Tracking Index (CTI) 23°C | PLC 4 | IEC 60112 |
| Breakdown Voltage 1 kV/s (23°C) | 25.9 kV | ASTM D149 |
| Breakdown Voltage Retention (180°C, 500 V/s) | >95.0 % | IEC 60243 |
| Dielectric Constant (23°C) 1 kHz | 3.20 | IEC 60250 |
| Dissipation Factor 1MHz | 3.0E-3 | IEC 60250 |
| Partial Discharge Inception Voltage, 23°C | 1526 V | IEC 60270 |
| Partial Discharge Inception Voltage, 180°C | 1190 V | IEC 60270 |
- High-voltage slot liner insulation in 800 V and above e-motor stator windings requiring maximum breakdown voltage within the unfilled XPI A-series
- Primary and secondary electrical insulation in high-power traction motors for electric vehicles where maximum dielectric margin is required
- Stator insulation in direct oil-immersion cooled electric machines operating under the most demanding electrical field conditions
- Phase insulation films in applications requiring the highest partial discharge inception voltage performance of the XPI A-series
- Resin-free electric machine insulation requiring wear resistance and chemical compatibility at elevated gauge
Common industries: Electric vehicle (EV) powertrain, e-motor manufacturing, automotive, industrial drives, aerospace electrification.
APTIV™ XPI A108 is the thickest gauge in the APTIV™ XPI A-series, representing the highest dielectric performance option within the unfilled semi-crystalline PEEK XPI film family.
At 200 µm, it achieves a breakdown voltage of 25.9 kV and a partial discharge inception voltage of 1526 V at 23°C — the highest values in the A-series — making it the grade of choice for 800 V and above electric machine applications where maximum dielectric margin is required. The film maintains an RTI Elec of 240°C per UL 746B, a glass transition onset of 143°C, and a melting temperature of 343°C per ISO 11357.
Tensile stress at 200 µm is 110 MPa in both MD and TD, with elongation exceeding 150% in both directions, maintaining compatibility with automated assembly line processing. The film is compatible with a wide range of impregnation resins, provides optimized wear resistance for resin-free machine concepts, and exhibits outstanding chemical and hydrolysis resistance to water, ATF, oils, and cooling fluids.
CLTE below Tg is 3.5E-5 cm/cm/°C (ASTM D696) and through-plane thermal conductivity is 0.25 W/m·K (ASTM E1461). Breakdown voltage retention at 180°C is >95.0% per IEC 60243. The standard supply format is a 650 mm wide roll, 650 m length, on a 152 mm (6″) core, with a standard roll outer diameter of 450 mm.
No compliance standards are specified on the manufacturer’s TDS for this material. The TDS references UL 746B for the RTI Elec value and IEC/ASTM test methods for property characterization.
What differentiates APTIV™ XPI A108 from A105, A106, and A107?
APTIV™ XPI A108 is the thickest and highest-performing dielectric grade in the unfilled XPI A-series. At 200 µm, it delivers a breakdown voltage of 25.9 kV — compared to 16.2 kV (A105), 18.9 kV (A106), and 21.6 kV (A107) — and a partial discharge inception voltage of 1526 V at 23°C and 1190 V at 180°C, both the highest values in the series. A108 is selected when the application demands the maximum available dielectric margin from the XPI A-series and slot geometry can accommodate the thicker gauge.
Why does tensile strength matter when selecting an e-motor insulation film?
In stator slot liner applications, the film must withstand the mechanical forces of automated insertion equipment, winding tension, and long-term vibration in service without tearing or cracking. APTIV™ XPI A108 achieves 110 MPa tensile stress in both MD and TD at 200 µm, combined with >150% elongation, ensuring reliable processing on automated assembly lines and mechanical durability throughout the motor's service life.
What is the operating temperature range for APTIV™ XPI A108?
The TDS reports a glass transition temperature onset of 143°C and a melting temperature of 343°C per ISO 11357. The Relative Thermal Index (Electrical) is rated at 240°C per UL 746B, indicating long-term electrical performance at this temperature.
Is APTIV™ XPI A108 suitable for regulated environments?
The TDS reports an RTI Elec of 240°C per UL 746B. No additional compliance certifications are listed on the manufacturer's TDS for this material.
How should APTIV™ XPI A108 be specified?
Specify grade (APTIV™ XPI A108), thickness (200 µm), compliance requirements, dimensional tolerances, and finished format.
