Meta Description: Discover the superior thermal, mechanical, and electrical properties of NHN, NMN, and NSN insulation papers. Learn why they are the top choice for high-voltage motor insulation.
High-voltage motors demand insulation systems that can withstand extreme temperatures, high electrical stress, and long-term mechanical wear. Among the various insulation materials available, NHN, NMN, and NSN composite papers have emerged as industry-leading solutions due to their exceptional thermal endurance, dielectric strength, and mechanical stability.
In this article, we explore the key performance advantages of NHN, NMN, and NSN insulation papers in the context of electrical machinery and motor winding applications.
These are three-layer composite insulating materials, each combining polyester film with aramid or non-woven fabrics:
NHN: Nomex® / Polyimide Film / Nomex®
NMN: Nomex® / Polyester Film / Nomex®
NSN: Non-woven Polyester / Polyester Film / Non-woven PolyesterKey Performance Advantages
Their unique multi-layer design provides an optimized balance of thermal resistance, dielectric insulation, and mechanical strength, making them ideal for slot liners, phase insulation, and interlayer insulation in high-voltage motors, generators, and transformers.
1. Excellent Thermal Endurance
NHN insulation paper boasts a Class H (180°C) thermal rating thanks to its aramid paper and high-temperature-resistant polyimide film.
NMN and NSN offer Class F (155°C) thermal performance, suitable for most high-voltage motor operating conditions.
2. High Dielectric Strength
The polyester film core provides robust electrical insulation, with breakdown voltages ranging from 5 kV to 12 kV, depending on thickness and structure.
This ensures safe operation under high-voltage loads.
3. Mechanical Durability
The outer layers (Nomex® or non-woven fabric) enhance tear resistance and dimensional stability, protecting the motor windings during manufacturing and operation.
Flexible yet tough, they can be easily slotted, folded, or wound without damage.
4. Moisture and Chemical Resistance
These composites maintain insulation performance in humid or chemically aggressive environments, reducing the risk of insulation degradation.
5. Versatile Applications
Used in slot insulation, phase insulation, end wrapping, and transformer coil interlayers.
Compatible with automated winding processes, improving productivity and consistency.
Their unique multi-layer design provides an optimized balance of thermal resistance, dielectric insulation, and mechanical strength, making them ideal for slot liners, phase insulation, and interlayer insulation in high-voltage motors, generators, and transformers.
| Property | NHN | NMN | NSN |
|---|---|---|---|
| Thermal Class | H (180°C) | F (155°C) | F (155°C) |
| Structure | Nomex / PI / Nomex | Nomex / PET / Nomex | Non-woven / PET / Non-woven |
| Dielectric Strength | High | High | Medium-High |
| Mechanical Strength | Excellent | Excellent | Good |
| Typical Application | High-performance motors | General industrial motors | Cost-effective systems |
At ZTelec Group, we manufacture and supply high-quality NHN, NMN, and NSN insulation papers that meet international standards. Our materials are widely used by OEMs and repair facilities in the electric motor and transformer industries.
With custom cutting, slitting, and laminating options, we offer flexible insulation solutions tailored to your specific motor designs.
Need reliable insulation solutions for your high-voltage motors?
► Contact us today to get a quote or request samples.
► Visit www.ztelecpro.com for more product details.
