Nomex® Laminate Type NMN Aramid Paper / Polyester Film Triplex Laminate
Nomex® Laminate Type NMN is a triplex laminate constructed of calendered Nomex® paper bonded to polyester film with a proprietary high-temperature adhesive system, designed not to delaminate or blister at high temperatures. The polyester film core contributes high dielectric strength along with good initial tear strength and tensile properties, while the calendered Nomex® paper outer layers provide long-term thermal stability and improved propagation tear strength. Type NMN is recognized in UL insulation systems for both Class F and Class H motors and generators.
Key Properties
- MD Tensile Strength (NMN 3-5-3, 0.012 in): 175 lb/in width — ASTM D882
- XD Tensile Strength (NMN 3-5-3, 0.012 in): 150 lb/in width — ASTM D882
- Dielectric Strength (NMN 3-5-3, 0.012 in): 17,000 volts — ASTM D149
- MD/XD Tear Strength (NMN 3-5-3, 0.012 in): 26 lbs / 18 lbs — ASTM D1004
- Thickness Range: 0.007–0.021 in nominal across 11 standard constructions — ASTM D374
- Temperature Rating: UL-recognized insulation system for Class F and Class H motors and generators
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- Specifications
- Applications
- General Info
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Electrical Properties (NMN 3-5-3, 0.012 in)
| Property | Value | Test Method |
| Dielectric Strength | 17,000 volts | ASTM D149 |
| Volume Resistivity | 10¹⁵ ohms-cm | ASTM D257 |
| Surface Resistivity | 10¹⁵ ohms/square | ASTM D257 |
Mechanical Properties (NMN 3-5-3, 0.012 in)
| Property | Value | Test Method |
| Nominal Thickness | 0.012 in | ASTM D374 |
| Product Yield | 1.64 yd²/lb (0.61 lb/yd²) | — |
| MD Tensile Strength | 175 lb/in width | ASTM D882 |
| XD Tensile Strength | 150 lb/in width | ASTM D882 |
| MD Tear Strength | 26 lbs | ASTM D1004 |
| XD Tear Strength | 18 lbs | ASTM D1004 |
Compliance
- UL-Recognized Insulation System — Compliant (Class F and Class H motors and generators)
- Slot liners in motors and generators
- Wedges and phase insulation in Class H motors and generators
- Insulation in large and specialty Class F motors
- Standardized insulation across multiple motor and generator classes
- Motor remanufacturing and repair insulation
Common industries: motor and generator manufacturing, motor remanufacturing and repair.
Nomex® Laminate Type NMN is a triplex construction of calendered Nomex® paper bonded to polyester film with a proprietary high-temperature adhesive system, engineered specifically not to delaminate or blister at high temperatures — an advantage over single-ply Nomex® papers in demanding motor and generator applications.
The polyester film core contributes high dielectric strength as well as good initial tear strength and tensile properties, while the calendered Nomex® paper outer layers provide long-term thermal stability and improved propagation tear strength.
Type NMN is broadly used in the manufacture and remanufacture of motors and generators across many sizes and temperature classes, most notably for slot liners, wedges, and phase insulation in Class H motors and generators and in large and specialty Class F motors. This versatility allows motor manufacturers and repair facilities to standardize on a single insulation material across multiple motor classes. Type NMN has a shelf life in excess of one year when stored at or below room temperature.
Compliant with UL-recognized insulation systems for Class F and Class H motors and generators.
What differentiates Type NMN from single-ply Nomex® papers?
Type NMN is a triplex laminate combining calendered Nomex® paper outer layers with a polyester film core, engineered specifically not to delaminate or blister at high temperatures — a construction advantage that single-ply Nomex® papers do not offer.
Why does tensile strength matter for laminate selection?
Type NMN's polyester film core delivers tensile strengths up to 314 lb/in (MD, grade NMN 3-14-3), allowing the laminate to withstand the wrapping and forming stresses involved in fabricating motor and generator slot liners and phase insulation.
What is the temperature suitability of Type NMN?
Type NMN is engineered not to delaminate or blister at high temperatures and is recognized in UL insulation systems for both Class F and Class H motors and generators; shelf life exceeds one year when stored at or below room temperature.
Is Type NMN suitable for regulated motor and generator insulation systems?
Yes. Type NMN is included in UL-recognized insulation systems for Class F and Class H motors and generators.
How should Type NMN be specified?
Specify grade (e.g., NMN 3-5-3), thickness, compliance requirements, dimensional tolerances, and finished format.
