AMA Composite Insulation Paper | High-Performance NMN Alternative for Class H/F Motors & Transformers
AMA Composite Insulation Paper is a high-performance, three-layer flexible composite material engineered as an ideal and cost-effective alternative to NMN (Nomex-Mylar-Nomex) insulation. It consists of a central layer of premium electrical-grade polyester film (Mylar) coated with specialized adhesives, bonded on both sides with high-grade H-class Aramid paper.
This advanced construction allows AMA to match or closely follow the rigid technical standards of NMN insulation. It provides superior dielectric properties, excellent thermal endurance, and outstanding mechanical strength, making it a reliable solution for high-temperature electrical equipment.
Key Features & Advantages
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Excellent NMN Alternative: Offers identical or comparable performance to traditional NMN insulation at a much more competitive price, significantly reducing manufacturing costs.
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Superior Thermal Resistance: With a thermal temperature index (TI) of ≥155°C (and compatibility for Class F/H applications), it maintains high stability under continuous thermal loads.
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Outstanding Mechanical Strength: High tensile strength and elongation (both before and after bending) ensure the material will not crack or tear during tight automated motor winding or slot-wedging processes.
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High Dielectric Properties: Exceptional breakdown voltage resistance (up to ≥23 KV for thicker variants) ensures maximum safety and minimal electrical leakage.
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Premium Thermal Adhesion: Tested at 180°C±2°C for 10 minutes with absolutely no delamination, no blistering, and no adhesive flow.
Typical Applications
AMA composite insulation paper is extensively used in heavy-duty and high-temperature electrical machinery:
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Dry-Type Transformers: Ideal for interlayer insulation, core wrapping, and phase barriers.
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Class F & Class H Electric Motors: Perfect for slot insulation, phase-to-phase insulation, and turn-to-turn liner sheets in industrial motors and generators.
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Automotive & Traction Motors: Used as slot liners for electric vehicle motors requiring high thermal reliability.
| No. | Test Item | Unit | Technical Indicators (Value) |
| 1 | Nominal Thickness | mm | 0.15 | 0.20 | 0.25 | 0.30 | 0.35 |
| 2 | Thickness Tolerance | mm | ±0.02 | ±0.02 | ±0.25 | ±0.3 | ±0.35 |
| 3 | Tensile Strength - MD (Machine Direction) Unbent - MD Bent - CD (Cross Direction) Unbent - CD Bent | N/10mm | ≥150 | ≥190 | ≥240 | ≥270 | ≥300 ≥80 | ≥110 | ≥170 | ≥200 | ≥250 ≥80 | ≥120 | ≥180 | ≥200 | ≥300 ≥50 | ≥100 | ≥150 | ≥150 | ≥200 |
| 4 | Elongation - MD (Machine Direction) - CD (Cross Direction) | % | ≥15 | ≥15 | ≥15 | ≥20 | ≥20 ≥20 | ≥20 | ≥20 | ≥25 | ≥25 |
| 5 | Breakdown Voltage | KV | ≥7 | ≥12 | ≥16 | ≥19 | ≥23 |
| 6 | Adhesion at Room Temp. | — | No Delamination |
| 7 | Thermal Adhesion (180°C±2°C, 10min) | — | No Delamination, No Blistering, No Adhesive Flow |
| 8 | Thermal Index (TI) | °C | ≥155 |
| 9 | Storage Life | Months | 12 |