High-Performance Meta-Aramid Paper: The Structural Backbone of Class H Electrical Insulation

In the world of high-voltage engineering, thermal failure is not an option. Our Meta-Aramid Paper is a synthetic fiber-based insulation material that bridges the gap between mechanical toughness and extreme thermal stability. Rated for continuous operation at 220°C, it provides a reliable dielectric shield that won’t crack, melt, or support combustion in the most demanding environments.

The Aramid Advantage: Beyond “Nomex” Standards

While Nomex is the industry benchmark, KAWIN’s Aramid Paper utilizes the same Poly-meta-phenylene isophthalamide chemistry to deliver identical thermal and mechanical performance. Our paper is calendered at high temperatures to achieve a dense, smooth finish that is ideal for automatic slot insertion and coil winding.

Critical Engineering Features

• Exceptional Thermal Endurance: Even after 20,000 hours of continuous exposure at 220°C, our aramid paper retains over 50% of its initial dielectric and tensile properties, ensuring a long service life for heavy-duty transformers.

• High Chemical & Radiation Stability: Compatible with almost all classes of transformer oils, lubricating greases, and refrigerants. Its molecular structure also makes it resistant to beta and gamma radiation—essential for aerospace and nuclear applications.

• Superior Mechanical Toughness: The high tensile strength (up to 150 N/cm) allows the paper to withstand the intense mechanical stresses of high-speed coil winding without tearing or delaminating.

• Rapid Saturation: Specifically engineered porosity (for uncalendered grades) allows for excellent resin and varnish absorption, creating a void-free insulation system.

High-Stakes Application Scenarios

• Transformer Insulation: Used as turn-to-turn insulation, layer insulation, and lead shielding in dry-type and liquid-immersed transformers.

• Motor & Generator Components: The industry standard for slot liners, phase insulation, and wedge strips in Class H rotating machinery.

• EV Battery Firewalls: Providing a thin, lightweight thermal barrier between battery cells to prevent thermal runaway propagation.

• Aerospace Composites: Acts as a bond-ply or structural insulation in aircraft interiors and engine compartments due to its low-smoke, non-toxic fire profile.

  Product Performance Specification Sheet

  Test Items	Unit	Test Method	Specification Values (Thickness Series)
  Thickness	mm	GB/T 451.3-2002	0.025	0.04	0.05	0.08	0.13
  Reference Weight	g/m²	GB/T 451.2-2002	21	30	42	63	116
  Dielectric Strength	KV/mm	GB/T 1408.1-2006	11	12	12	13	13
  Dielectric Constant	–	GB/T 1408.1-2006	1.5	1.5	1.5	1.5	2.1
  Dielectric Loss Factor	x10⁻³	GB/T 1409-2006	4	4	4	5	6
  Density	g/cc	–	0.7	0.67	0.74	0.8	0.89
  Tensile Strength	MD	N/cm	GB/T 12914-2008	16	24	35	63	130
  	TD	N/cm	GB/T 12914-2008	6	9	14	26	52
  Elongation	MD	%	GB/T 12914-2008	3.1	4.5	6.0	7.5	9.0
  	TD	%	GB/T 12914-2008	4.0	5.0	6.0	8.0	10.5
  Tear	MD	N	GB/T 455-2002	0.3	0.5	0.6	1.0	2.0
  	TD	N	GB/T 455-2002	0.55	0.7	1.1	1.7	3.0
  Flame Retardancy	–	UL-94	V0/VTM-0

Custom Lamination & Precision Slitting

We understand that modern insulation often requires multi-layer solutions. KAWIN offers:

1. AMA / APA Lamination: Aramid paper laminated with Polyester (PET) or Polyimide (PI) film to combine dielectric strength with mechanical rigidity.

2. Custom Calendering: Options for Soft (Uncalendered) for maximum impregnation or Hard (Calendered) for maximum dielectric density.

3. Die-Cut Precision: Ready-to-use slot liners and gaskets cut to within ±0.2mm tolerance.

4. Narrow Slitting: Master rolls slit down to 5mm width for high-speed cable wrapping.

FAQ

Q: Is your aramid paper a direct replacement for Nomex 410? A: Yes. Our calendered Meta-Aramid paper meets the equivalent thermal and dielectric specifications of the 410 series, making it a drop-in replacement for most industrial and electrical applications.

Q: Does aramid paper absorb moisture? A: Aramid paper is inherently resistant to moisture. While it may absorb small amounts in high-humidity environments, its dielectric strength remains remarkably stable, unlike cellulose-based pressboards.

Q: Can it be used in oil-immersed transformers? A: Absolutely. Meta-Aramid is chemically compatible with both mineral and synthetic transformer oils, and it actually helps extend the life of the oil by reducing acidic degradation.