Product Description
Nomex® 410 is the original form of Nomex aramid paper and the benchmark for electrical sheet insulation. Made entirely of synthetic meta-aramid polymer and calendered to a dense, smooth finish, it delivers high inherent dielectric strength, mechanical toughness, flexibility and resilience with no varnish or resin treatment required. This 10 mil (0.25 mm) sheet measures 36 in. x 36 in. and is stocked by FindTape for cutting, punching and forming into slot liners, phase separators, layer insulation, barriers and wedges.
Nomex 410 is recognized by Underwriters Laboratories as a 220°C (428°F) insulation. Temperatures up to 200°C (392°F) have little or no effect on its electrical and mechanical properties, and useful values are retained well above that. It will not melt or drip, carries a UL 94 V-0 flammability rating and, with a limiting oxygen index above 20.8% even at 220°C, does not support combustion in normal air. The paper is essentially unaffected by most solvents, is unusually resistant to acids and alkalis, and is compatible with all classes of electrical varnishes and adhesives, transformer fluids, lubricating oils and refrigerants. It also retains its properties after heavy beta and gamma radiation exposure and works well in cryogenic service.
Applications
- Slot, phase and wedge insulation in AC and DC motors and generators
- Layer, barrier and ground insulation in dry-type and liquid-filled transformers
- Coil, choke and reactor insulation
- Insulating wrap for cables, conductors and bus bars
- Heat shields and thermal barriers in automotive, transit and appliance assemblies
- Insulation in EV, wind turbine and other high-demand electrical systems
Handling Notes
Like other papermaking products, Nomex 410 has somewhat different properties in the machine direction (MD) than in the cross direction (XD); orient the sheet to the direction that gives the best performance for your part. Water is a mild plasticizer for the paper, so keep sheets sealed in their polyethylene wrapper until use to maintain uniform moisture content for critical laminating or creping operations. Common solvents such as alcohols, ketones, acetone, toluene and xylene have a slight, mostly reversible softening effect. Country of Origin: United States.
* Multiple cases may be shipped per package in order to minimize the charge for shipping.
Technical Information
FindTape Nomex 410 Aramid Paper Electrical Insulation Sheet
- Carrier/Backing: meta-aramid paper, calendered
- Adhesive: acrylic How are adhesives different?
- Release Liner: paper
- Thickness: 10 mils (carrier) What is mil thickness?
- Tensile Strength: 169 pounds per inch (longitudinal)
- Service/Operating Temperature: up to 428°F
- Elongation: 22%
- Core: 3" diameter
- Weight: 7 ounces
- Basis Weight: 249 g/m² (7.3 oz/yd²), ASTM D646
- Density: 0.96 g/cc
- Dielectric Strength (AC rapid rise): 845 V/mil (33 kV/mm), ASTM D149
- Full Wave Impulse Dielectric Strength: 1,600 V/mil (63 kV/mm), ASTM D3426
- Dielectric Constant (60 Hz): 2.7, ASTM D150
- Dissipation Factor (60 Hz): 0.006, ASTM D150
- Elmendorf Tear: 5.6 N MD, 10.6 N XD, TAPPI 414
- Initial Tear Strength: 69 N MD, 42 N XD, ASTM D1004
- Thermal Class: 220°C (428°F), UL 746B RTI 220 electrical and mechanical
- Flammability: UL 94 V-0
- Limiting Oxygen Index: 27 to 32% at room temperature, 22 to 25% at 220°C, ASTM D2863
- Thermal Conductivity: 139 mW/m-K at 150°C, ASTM E1530
- UL Ratings (746A): HWI 0, HAI 0, HVTR 3, CTI 3
- Country of Origin: United States
Note: Specifications are those given by manufacturers and are not tested for accuracy.