| Insulating Materials | Dielectric strength | Thermal Class | Shrinkage % |
Inner Diameter mm | Tube Length mm | Insulator cap Types |
|---|---|---|---|---|---|---|
| Mylar® A Polyester film, Type A |
4 – 19kV | B – 130°C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps |
| Hostaphan® 2MSO Heat-shrink polyester (HS) |
3,5 – 7kV | B – 130°C | 35 | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps Bullnose |
| Hostaphan® 2LSO Low-shrink polyester | 3,5 – 7kV | B – 130°C | 15 | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps Semi-caps |
| DMD Woven/no-woven polyester |
7 – 8kV | B – F / 130-155°C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps Bullnose |
| Nomex® – Mylar® A Polyester Type A |
4 – 19kV | F – H / 155-180°C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps |
| Nomex® 411 – Hostaphan® 2MSO | 4 – 19kV | F – H / 155-180°C | 30 | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps Bullnose |
| Nomex® 410 – 411 – 464 – 864 |
9 – 35kV | H – 180 °C | No | 1,8 – 150 | 6,6 – 14.000 | Not available |
| Kapton® HN/FN Polyimide film |
240 – 303kV | C > 255 °C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps |
| Nomex® – Kapton® HN/FN | 17 – 33kV | H – C 220 °C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps |
| Nomex®/Kapton® HN/Nomex® | 17 – 33kV | H – C 220 °C | No | 1,8 – 150 | 6,6 – 14.000 | Ultrasonic welded caps |
| Ajedium® (Syensqo™) PEEK & PPSU |
7,8 – 23,6 kV | Up to 300°C | No | 1,8 – 150 | 6,6 – 14.000 | Not available |
| Dielectric Kraft Paper | 8 kV | A – 105°C | No | 1,8 – 150 | 6,6 – 14.000 | Not available |
Mylar®, Kapton®, Nomex ® are DuPont registered trademarks – Hostaphan® is a Mitsubishi registered trademark – Ajedium® is a Syensqo registered trademark.
Electrical Insulating Materials: Selection, Performance, and Traceability
Politubes carefully selects top-grade UL-certified technical films, validated through stringent in-house and third-party testing. Materials are chosen for their exceptional dielectric, thermal, chemical, and mechanical properties, ensuring full compliance with international standards and high-demand industry requirements.
Our multilayer constructions are engineered to combine the unique features of each individual film, delivering tailor-made solutions optimized to meet specific customer performance needs.
PFAS-Free Electrical Insulation – Broad Thermal Classes
All Politubes’ insulating tubes and caps are PFAS-free and manufactured to meet the following thermal insulation classes:
- Class A – 105 °C
- Class B – 130 °C
- Class F – 155 °C
- Class H – 180 °C
- Class C – >400 °C
The materials feature dielectric strength ranging from 3 kV/mm to 300 kV/mm, compliant with ASTM D149, enabling high-voltage protection even under critical electrical stress.
Mechanical Behavior and Dimensional Stability
Depending on application requirements, Politubes utilizes:
- Low-shrink AHS – 2LSO films (10–15%) for superior dimensional stability;
- High-shrink HS films (up to 40%) for secure mechanical sealing and adaptive fit applications.
Certified Traceability System
All raw materials are tracked through a barcode-based traceability system, ensuring full visibility across the production chain. This system is certified according to UL TEOU2–TEOU8 (E350605) and ISO 9001:2015, supporting a transparent and auditable supply chain.
Material Innovation and R&D Excellence
Politubes’ R&D center is continuously focused on researching and developing new materials and composite film structures that provide technical, economic, and qualitative benefits for our B2B clients. Our innovation roadmap includes both custom-engineered materials and sustainable alternatives for future-ready applications.