AHA Composite Polyimide Insulation Paper

What Is AHA Composite Polyimide Insulation Paper?

AHA composite polyimide insulation paper is a three-layer laminated material engineered for high-temperature electrical insulation applications. The composite structure consists of a polyimide (PI) film core sandwiched between two layers of aramid fiber paper, all bonded together with H-grade (Class H) polyimide adhesive. This construction creates a material that combines the dielectric strength of polyimide film with the processability and bonding characteristics of aramid paper.

The aramid paper used in AHA insulation is a domestic-manufactured material with performance characteristics similar to DuPont's Nomex® meta-aramid paper, but at a more cost-effective price point. This makes AHA an excellent choice for manufacturers seeking reliable Class H insulation without the premium cost associated with branded Nomex®-based products like NHN nomex insulation paper.

• Base material: Aramid paper

• Inner layer: Polyimide film

Technical Specifications & Properties

• Thickness: 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm  etc

• Standard roll width: 914 mm

• Roll weight: 50~60kg/roll

• Thermal class: H Class 180℃
  

• Surface Finish: Smooth, uniform texture

Why Choose AHA Composite Polyimide Insulation Paper?

1. Cost-Effective Class H Performance

AHA delivers reliable Class H (180°C) thermal rating at a significantly lower cost than NHN (which uses branded DuPont Nomex®). For manufacturers and importers targeting price-sensitive markets across Southeast Asia, South Asia, and Africa, AHA provides the thermal performance required for compliance without the premium pricing of branded alternatives. Cost savings typically range from 10–25% compared to NHN, making AHA the practical choice for high-volume production.

2. Superior Flexibility & Processability

The aramid paper outer layers in AHA have higher elongation at break (≥25%) compared to NHN (≥20%), making AHA more conformable and easier to process in tight slot geometries. This flexibility is particularly valuable for small and medium-frame motors where slot dimensions are constrained. Automatic slot-insertion machinery experiences fewer jams and processing delays with AHA, reducing production downtime and labor costs.

3. Excellent Mechanical Properties

AHA exhibits outstanding tear strength (≥150 mN Elmendorf) and edge-tearing resistance, making it ideal for high-speed cutting and slicing operations. The smooth surface finish ensures barrier-free processing when using automated off-line machines to produce low-voltage motors. These mechanical properties translate to fewer scrap pieces during manufacturing and higher overall yield rates.

4. Proven Reliability in High-Volume Production

AHA has been extensively tested and validated in millions of motor units across industrial, appliance, and power tool applications. The material's consistent performance under thermal cycling, moisture exposure, and electrical stress has made it the standard choice in cost-sensitive markets where reliability must not be compromised for price.

5. Seamless Integration with Existing Processes

AHA is fully compatible with standard motor manufacturing processes, including vacuum pressure impregnation (VPI), resin coating, and automated winding machinery. No process modifications are required when switching from other Class H materials to AHA, minimizing transition costs and production interruptions.

Applications & Use Cases

AHA composite polyimide insulation paper is engineered for the following electrical insulation applications in Class H systems:

1. Slot Insulation in Low-Voltage Motors

AHA is the industry standard for slot liners in AC induction motors rated up to 690V. The material's smooth surface and excellent dielectric strength ensure reliable insulation between the copper windings and the iron stator core. 

2. Liner Insulation & Slot Covers

In addition to slot insulation, AHA is used as a protective liner on the inner surface of motor slots and as slot-wedge insulation to hold coils in place. 

3. Phase Insulation Between Coil Groups

AHA is applied as phase insulation to electrically separate different phase windings within the same slot. This prevents phase-to-phase short circuits and ensures proper voltage distribution across the motor winding.

4. Turn Insulation in Form-Wound Coils

For larger motors and generators with form-wound coils, AHA can be used as turn insulation to separate individual turns within a coil. 

5. Interlayer Insulation in Transformers

AHA is widely used in oil-immersed and dry-type transformers as interlayer insulation between primary and secondary windings. 

Packaging & Shipping

• Standard Packaging: Rolls wrapped in kraft paper and plastic film, palletized for safe transport.

• Minimum Order Quantity (MOQ): Flexible depending on thickness and width.

• Mixed Container Orders: We accept mixed-product containers combining AHA with other insulation materials (NHN, DMD, NMN, PVC sleeves, etc.).

• Lead Time: Standard lead time is 15–20 days from order confirmation to shipment.

Certified Test Reports (CTR)

Each shipment includes a Certified Test Report (CTR) from an independent third-party laboratory, documenting:

Dielectric strength (breakdown voltage)

Tensile strength and elongation

Tear strength (Elmendorf method)

Moisture absorption

Thermal endurance

Flame resistance classification

Frequently Asked Questions (FAQ)

Q1: What is the difference between AHA and NHN insulation paper?

AHA uses para-aramid fiber paper (non-branded) as the outer layers, while NHN uses DuPont's Nomex® meta-aramid paper. Both are Class H rated (180°C), but NHN has higher dielectric strength (≥12 kV vs. ≥11 kV at 0.18 mm), while AHA has better flexibility and lower cost (10–25% savings). Choose AHA for cost-sensitive applications; choose NHN for premium or safety-critical applications.

Q2: What is the typical thickness of AHA used for motor slot insulation?

The most common thicknesses are 0.18 mm for small-frame motors (IEC 80–160) and 0.25 mm for medium-frame motors (IEC 160–280). Larger motors may use 0.32 mm thickness. The choice depends on slot geometry, voltage class, and motor design specifications.

Q3: What is the minimum order quantity (MOQ) for AHA insulation paper?

The MOQ is flexible depending on thickness and width. Mixed-product containers are accepted, allowing you to combine AHA with other insulation materials in a single shipment.