NHN, NMN, AHA, AMA Insulation Paper Selection Comparison

NHN, NMN, AHA, AMA Insulation Paper Introduction 1. NHN Insulation Paper NHN is a Nomex®–Polyimide–Nomex® three-lay...

NHN, NMN, AHA, AMA Insulation Paper Introduction

1. NHN Insulation Paper

NHN is a Nomex®–Polyimide–Nomex® three-layer composite insulation paper, H-class 180°C rated, with high dielectric strength, tear resistance, and vibration tolerance. It is ideal for high-temperature motors, traction motors, and high-speed motors for slot liners, layer insulation, and coil wrapping.

2. NMN Insulation Paper

NMN is a Nomex®–PET–Nomex® composite, F-class 155°C rated, flexible and cost-effective. Commonly used in general motors and transformers for slot liners, layer insulation, and coil wrapping, providing a balance of reliability and affordability.

3. AHA Insulation Paper

AHA is an aramid–heat-resistant film–aramid composite, H-class 180°C rated, with high dielectric strength and excellent mechanical toughness. Suitable for high-temperature motors, dry-type transformers, and EV motors for slot insulation and end-winding protection.

4. AMA Insulation Paper

AMA is an aramid paper–polyester film–aramid composite, F-class 155°C rated, offering good flexibility and cost advantages. It is suitable for general-purpose motors, low-voltage transformers, and standard winding insulation, meeting conventional motor operating requirements.

NHN, NMN, AHA, AMA Insulation Paper Selection Comparison

Item	NHN	NMN	AHA	AMA
Structure	Nomex® + PI + Nomex®	Nomex® + PET + Nomex®	Aramid + Heat-resistant film + Aramid	Aramid paper + Polyester film + Aramid
Temperature Class	H Class 180°C	F Class 155°C	H Class 180°C	F Class 155°C
Dielectric Strength	★★★★★ (Highest)	★★★★	★★★★☆	★★★
Mechanical Strength	★★★★★ (High Tear Strength)	★★★★	★★★★	★★★
Flexibility	★★★★	★★★★★ (Most Flexible)	★★★★	★★★★
Voltage Withstand	Excellent	High	High	Medium
Thermal Shock Resistance	Excellent	Good	Excellent	Medium
Moisture Resistance	★★★★★	★★★★	★★★★★	★★★
Long-term Aging	Excellent	Good	Excellent	Medium
Cost	High	Medium-Low	Medium	Low
Typical Thickness Range	0.10–0.40 mm	0.10–0.40 mm	0.10–0.40 mm	0.10–0.35 mm

Recommended Use Conditions

Operating Condition	Recommended Material	Reason
High-temp 180°C motors / High-frequency motors	NHN / AHA	PI layer provides high thermal stability and long-term reliability
155°C general motors, transformers	NMN / AMA	Cost-effective, suitable for standard applications
High-voltage / high dielectric requirement	NHN	Highest dielectric strength for slot and layer insulation
High flexibility / forming requirements	NMN / AMA	PET layer offers superior flexibility
High vibration / high impact motors	NHN / AHA	High tear strength, vibration-resistant
Cost-sensitive mass production	NMN / AMA	Cost advantage

Recommended Applications in Key Equipment

Equipment	Best Choice	Alternative
Servo motors, variable frequency motors	NHN	AHA
EV drive motors	NHN	AHA
Dry-type transformers	NMN	AMA
Small general-purpose motors	NMN	AMA
High-voltage / high-speed motors	NHN	AHA
Traction motors / industrial motors	NHN	NMN
UPS, chargers, power supply modules	NMN	AMA

Quick Selection Guide

Choose NHN if:

High temperature H-class 180°C required

High dielectric strength needed (slot liners, layer insulation)

Strong tear and vibration resistance required

Used in servo motors, VFD motors, traction motors, EV motors

Choose NMN if:

For general motors and transformers

Cost-effective with moderate flexibility

155°C operating conditions are sufficient

Choose AHA if:

H-class 180°C thermal rating required

Combination of flexibility + high thermal resistance needed

Suitable for high-temperature transformers and motors

Choose AMA if:

Cost-effectiveness is the priority

Standard 155°C operating conditions

Suitable for general-purpose motors or low-voltage transformers