In the world of electrical insulation, the choice of material can mean the difference between reliable operation and catastrophic failure—especially in high-voltage motors and generators operating under extreme conditions. The Polyimide Film Mica Tape from Hanyao represents the premium tier of mica-based insulation products. By replacing polyester film with high-performance polyimide film, this tape achieves insulation levels of Class H (180°C) and even Class C (220°C), far exceeding the Class F rating of conventional polyester mica tapes. With excellent dielectric strength, mechanical toughness, and chemical resistance, it is the material of choice for demanding applications in aerospace, defense, and heavy industry. This article examines its technical specifications, key advantages, and the applications where it delivers unmatched reliability.
High-voltage motors and generators are the workhorses of modern industry, but they operate in conditions that push materials to their limits. Heat, electrical stress, mechanical vibration, and chemical exposure can quickly degrade standard insulation systems. When a motor fails in a critical application—such as a power plant, a ship, or an aerospace system—the consequences can be severe: costly downtime, safety risks, and significant financial losses. This is where the Polyimide Film Mica Tape from Hanyao comes into play.
The tape is a composite material consisting of three layers: a polyimide film backing, a mica layer, and an adhesive. Its structure is similar to conventional polyester mica tape, but the critical upgrade is the replacement of polyester film with polyimide film—a material that offers exceptional thermal stability and electrical properties. This single change elevates the tape's performance to a level that meets the most demanding insulation requirements.
Polyimide film is widely recognized as one of the best-performing organic films available today. Its long-term operating temperature exceeds 220°C, which allows the tape to achieve Class H (180°C) and even Class C (220°C) insulation levels. For context, standard polyester mica tape is typically rated Class F (155°C). This temperature advantage is not incremental—it is transformative. In environments where heat is a constant challenge, this tape provides a safety margin that ensures long-term reliability.
Beyond thermal resistance, polyimide film offers exceptional dielectric strength and insulation resistance. The combination of polyimide film with high-quality mica results in a composite material with outstanding electrical properties. The tape delivers breakdown strength exceeding 45 kV/mm, making it suitable for high-voltage applications that require robust insulation.
The table below summarizes the key specifications for the Polyimide Film Mica Tape from Hanyao. These figures provide a quantifiable measure of the product's performance.
| Item | Unit | Specification 1 | Specification 2 | Specification 3 |
| Thickness | mm | 0.07±0.01 | 0.08±0.01 | 0.09±0.01 |
| Volatile Content | % | ≤1.0 | ≤1.0 | ≤1.0 |
| Adhesive Content | % | ≤10.0 | ≤10.0 | ≤10.0 |
| Adhesive Weight | g/m² | 5±2 | 5±2 | 7±3 |
| Mica Weight | g/m² | 60±5 | 70±5 | 80±7 |
| Polyimide Film Weight | g/m² | 42±5 | 49±5 | 42±5 |
| Breakdown Strength | kV/mm | ≥45 | ≥45 | ≥45 |
| Tensile Strength | N/10mm | ≥35 | ≥35 | ≥35 |
The breakdown strength of ≥45 kV/mm reflects the material's ability to withstand high voltages without failure. The tensile strength of ≥35 N/10mm indicates that the tape can withstand the mechanical stresses encountered during winding and installation. The low volatile content ensures that the tape does not release harmful gases during operation, which is particularly important in enclosed systems.
The exceptional properties of this tape make it suitable for high-end and specialized fields where standard insulation materials are not sufficient. Typical applications include:
• High-voltage motors and generators – Provides reliable insulation for stator coils and rotor windings in power generation and heavy industrial applications.
• Motors operating in extreme environments – Suitable for applications with high temperatures, high humidity, or exposure to chemicals.
• Defense and aerospace systems – Meets the stringent reliability requirements of military and aerospace electrical systems where failure is not an option.
• Special motors – Used in specialized motor designs where standard insulation cannot meet the performance requirements.
• Corona resistance applications – The tape offers excellent corona resistance, making it suitable for high-voltage systems where corona discharge is a concern.
The tape's ability to maintain its properties at elevated temperatures and under electrical stress makes it a preferred choice for engineers designing systems that must operate reliably for decades.
Hanyao is committed to delivering insulation materials that meet the highest quality standards. The tape has been tested by the third-party laboratory CEMT at the request of customers, confirming its compliance with industry standards. The company maintains strict quality control throughout the production process, from raw material selection to final testing.
The company's partners are equipped with state-of-the-art production lines and modern laboratories to ensure consistent product quality. Regular updates and production status reports are provided to customers, ensuring transparency and trust throughout the supply chain. In the event of a customer complaint, Hanyao provides prompt responses and effective solutions.
A: The tape achieves insulation levels of Class H (180°C) and Class C (220°C), depending on the specific formulation and application.
A: The key difference is the reinforcing material. Polyimide film replaces polyester film, providing significantly higher thermal resistance, better mechanical strength, and superior chemical stability.
A: Yes. Polyimide film offers excellent chemical resistance, making the tape suitable for applications where exposure to chemicals is a concern.
A: The tape has a breakdown strength of at least 45 kV/mm, providing reliable electrical insulation for high-voltage applications.
A: Yes, free samples are available for evaluation upon request.
A: Lead times depend on the order quantity and specifications. The company provides prompt production and shipment to meet customer requirements.
The Polyimide Film Mica Tape from Hanyao offers a high-performance insulation solution for the most demanding motor and generator applications. With its Class H and Class C thermal ratings, excellent dielectric strength, and robust mechanical properties, it provides the reliability that engineers require in critical systems. Backed by third-party testing and a commitment to quality, this tape is a trusted choice for high-end and specialized electrical applications. For technical specifications, sample requests, or to discuss your project requirements, the Hanyao team is available to provide detailed product information and professional support.
