Nomex / Aramid Paper for High-Temperature Insulation
- Nomex aramid paper is chosen for insulation parts that must hold dielectric performance at elevated temperatures.
- Common formats include slot liners, phase barriers, washers, wrap pieces, transformer strips, and adhesive-backed parts.
- Nomex 410 thicknesses from 0.05 mm to 0.76 mm cover both compact barriers and more rigid insulation builds.
- The final build depends on thickness, stiffness, bend radius, adhesive need, and end-use assembly.
- ODT supports sampling, lamination, and production die cutting in sheet, strip, or assembly-ready formats.
Nomex is a well-known meta-aramid electrical insulation paper selected for converted parts that must handle elevated temperature, dependable dielectric separation, and a more substantial paper structure than thin plastic films. In die-cut projects, engineers usually care most about grade, thickness, stiffness, dielectric behavior, and whether the final part needs lamination or adhesive support.
For many motor, transformer, battery, and industrial electrical programs, Nomex / aramid paper is chosen when the design needs a combination of heat endurance, electrical isolation, and mechanically stable converted geometry.
- Well suited for slot liners, phase barriers, busbar wraps, transformer insulation strips, washers, and assembly-ready insulating shapes.
- Often supplied as plain sheet parts, slit strips, adhesive-backed constructions, or laminated insulation stacks.
- Useful when the application needs more body and heat resistance than standard PET insulation films.
| Representative Grade | DuPont Nomex Type 410, representative reference at 0.25 mm / 10 mil thickness. |
|---|---|
| Standard Thicknesses | 0.05 mm to 0.76 mm, equivalent to 2 mil to 30 mil, with common gauges including 0.13 mm, 0.18 mm, 0.25 mm, 0.38 mm, and 0.51 mm. |
| Basis Weight and Density | 128.2 g/m² basis weight and 0.87 g/cm³ apparent density at the 0.25 mm / 10 mil reference grade. |
| Dielectric Performance | 18 kV dielectric strength and dielectric constant 1.6 at 60 Hz for the 0.25 mm / 10 mil reference grade. |
| Mechanical Strength | Tensile strength 13.5 kN/m in machine direction and 9.0 kN/m in cross direction at 0.25 mm / 10 mil. |
| Thermal Class and Flame Behavior | UL Relative Thermal Index 220 C and limiting oxygen index 28 for the 0.25 mm / 10 mil reference material. |
| Thermal Conductivity | 0.139 W/m-K at 150 C for the 0.25 mm / 10 mil reference grade. |
We supply die-cut Nomex and aramid paper parts for projects that need dependable electrical insulation in environments where temperature, voltage separation, or part rigidity rule out simpler paper or film choices. Typical uses include motor slot liners, transformer barriers, busbar wraps, battery pack insulation pieces, charger spacers, and industrial electrical separators.
Motors and Generators:
Used for slot liners, phase insulation, and wrap pieces that need electrical separation and elevated temperature stability.
Transformers and Coils:
Used for layer insulation, end barriers, wraps, and formed insulating shapes inside transformer and inductor structures.
Battery and Power Electronics:
Used for pack barriers, busbar insulation, cell-edge protection pieces, and other converted parts where heat resistance and dielectric stability both matter.
Industrial Electrical Systems:
Chosen for chargers, switchgear, industrial controls, and equipment builds that need rugged die-cut insulating components.
Nomex / aramid paper is usually selected when the design needs a heat-resistant paper barrier with stronger body than a thin film. That makes it valuable for motor, transformer, and battery-related structures where the part must insulate electrically while still holding shape through assembly.
In material selection, buyers often compare Nomex against PET or Mylar when cost and thinness are priorities, or against Kapton when the build needs a very thin high-temperature film instead of a paper structure. The right answer depends on thickness, bend behavior, dielectric target, and final converted geometry rather than material name alone.
If your team is still comparing insulation routes across film, paper, and laminated structures, our electrical isolation die-cutting solutions page is a useful next step for broader application context.
Nomex / Aramid Paper Formats We Support
Plain sheet, slit roll, adhesive-backed paper, laminated insulation stacks, slot-liner strips, washers, wraps, barriers, and custom die-cut parts for motors, transformers, battery packs, and industrial electrical assemblies.
Custom Die-Cutting Services
for Nomex / Aramid Paper
We supply custom die-cut Nomex and aramid paper parts for motor slot insulation, transformer barriers, busbar wraps, battery protection layers, and rugged electrical assemblies. Formats can be delivered as individual parts, sheets, strips, or laminated builds matched to your downstream assembly flow.
For prototype geometry checks, we can start with laser cutting. Once the part structure is stable, we normally shift to production-oriented die cutting with attention to edge condition, hole accuracy, stacking behavior, and usable packaging.
Precise Converting Process
for Nomex / Aramid Paper
Nomex paper converts very differently from thin plastic films. The process has to account for stiffness, fiber direction, dust control, bend behavior, and whether the part must stay flat, wrap around copper, or enter a laminated stack after cutting.
Depending on thickness and output format, we may recommend flatbed die cutting, rotary die cutting, precision slitting, or multi-layer lamination. For contamination-sensitive builds or adhesive-backed insulation layers, we can also review a cleanroom die cutting workflow before production.
Nomex / Aramid Paper – Our Precision Die-Cutting Solutions
Our Die-Cutting Equipment
Our converting workflow supports sheet-fed and strip-fed insulation builds for Nomex / aramid paper programs. This matters when the project needs repeatable apertures, narrow bridges, layered builds, or more rigid insulating pieces that must stay usable after packing and handling.
When the part also needs adhesive support or additional dielectric layers, we can plan the process around the finished structure instead of treating Nomex as a simple one-layer paper cutout.
Our Die-Cutting Quality Control
Nomex parts often go into electrically critical zones, so we inspect dimensions, aperture integrity, edge fuzz, dust level, lay-flat behavior, and packing condition before shipment. That becomes especially important when the part supports motor windings, transformer layers, or high-voltage spacing.
If the application is primarily driven by dielectric separation inside a larger product build, our electrical isolation die-cutting solutions page shows the broader system use case.
Our Inspection Team
Our inspection team reviews finished Nomex parts in the format customers actually receive, whether that is sheeted pieces, slit strips, nested kits, or laminated assemblies. That helps confirm not only the cut geometry, but also whether the parts can be handled, wrapped, and applied consistently in downstream assembly.
Our Mold Management
For recurring Nomex programs, tooling control matters because changes in bridge size, fiber direction, and nesting can affect release behavior, waste removal, and final part consistency. We review die condition, part release, and stack behavior together so the converted part can scale cleanly from sample stage to mass production.
Our Product Cases
Typical Nomex cases include motor slot liners, transformer barriers, busbar wraps, pack insulation rings, cell-edge protection pieces, charger insulation pads, and industrial electrical separators. In these programs, the value usually comes from combining temperature endurance, dielectric strength, and reliable converted geometry in one part.
Teams comparing paper-based insulation with film-based or layered structures often also review our insulation and protection solutions page and our battery insulation paper page at the same time.
Contact us to customize your Nomex / aramid paper solutions.
Frequently Asked Questions
These are the questions engineers and sourcing teams most often ask when they compare Nomex / aramid paper for motors, transformers, battery packs, and other high-temperature electrical insulation programs.
What is Nomex / aramid paper mainly used for in die-cut parts?
Nomex / aramid paper is mainly used for high-temperature electrical insulation parts. In die-cut form, it is commonly converted into motor slot liners, transformer barriers, busbar wraps, battery protection pieces, insulating washers, and rugged electrical separators. Buyers usually choose it when the part needs stronger heat resistance and more structural body than a thin polyester film can provide, while still maintaining dependable dielectric separation in compact assemblies.
How is Nomex paper different from Mylar or Kapton film?
Nomex paper is different because it is a heat-resistant aramid paper, not a plastic film. That usually gives it more body and stiffness than Mylar, while also making it useful in motor and transformer insulation where a formed paper barrier is preferred. Compared with Kapton, Nomex is often chosen when the application wants a paper-based insulating structure rather than an ultra-thin high-temperature film. The right choice still depends on thickness, bend radius, dielectric target, and final assembly method.
Can Nomex paper be supplied with adhesive or in laminated stacks?
Yes, Nomex paper can be supplied plain, adhesive-backed, or as part of a laminated insulation stack. That is common when the part needs easier placement, a protective liner, or a combined paper-and-film structure for electrical separation and assembly convenience. Before recommending the final construction, we usually review thickness, adhesive type, bend requirement, and whether the finished part will be supplied as individual pieces, strip format, or layered assemblies.
What information should I provide for a Nomex die-cutting quote?
Provide the grade, thickness, part drawing, application, temperature target, electrical requirement, adhesive need, and preferred delivery format. It also helps to share whether the project is for prototype sampling or volume production, and whether the parts should arrive as sheets, strips, nested kits, or laminated builds. Those details directly affect tooling route, part stability, and the most suitable converting process for the material.
Is Nomex paper suitable for EV battery and power electronics insulation?
Yes, Nomex paper can be suitable for EV battery and power electronics insulation when the design needs heat resistance, dielectric separation, and a more robust paper barrier. It is often considered for busbar wraps, pack barriers, insulation pads, and other parts that must hold shape while managing electrical spacing. The final grade still needs to be checked against thickness, bend path, voltage requirement, and the rest of the insulation stack before production is locked.
Send Your Inquiry Today
Share your drawing, grade, thickness, adhesive requirement, application, and target quantity. We can help confirm whether Nomex / aramid paper is the right converted insulation format for your project.