Nomex: Aramid Fiber Paper
Aramid fiber, more commonly known by its brand name, Nomex, is a common choice of electrical insulation for many electrical equipment applications. It has a great combination of strength, thermal stability, and dielectric strength, making it the benchmark to which all other electrical insulation products are judged.
Applications include: Motor insulation, transformer insulation, generator insulation, coil separators, slot liners, end fillers
- Available in paper roll and pressboard sheet format
- Exceptional thermal stability at operating temperatures up to 200 °C
- Inherent dielectric strength
- UL 94 VTM-0 and V0 flammability rating
- UL 746A HWI-0, HAI-3 or less, HVTR-3, CTI-3
- Outstanding mechanical toughness to resist tearing and abrasion
- Excellent chemical resistance to acids, alkalis, solvents, oils, and refrigerants
- Excellent flame resistance does not support combustion
| Aramid Fiber | ||||
| Property | Units | 410 | 993 | 994 |
| Product Brands | ||||
| Material Type | Aramid Fiber Paper | Medium Density Aramid Fiber Pressboard | High Density Aramid Fiber Pressboard | |
| Available Thicknesses | Inches | 0.060 - 0.076 | 0.040 - 0.160 | 0.040 - 0.380 |
| Density | g / cc | 0.83 | 0.73 | 1.15 |
| Tensile Strength (machine direction, cross direction), ASTM-D828 | PSI | 135, 71 | 5800, 4800 | 15500, 13500 |
| Elongation (machine direction, cross direction), ASTM-D828 | % | 12, 9 | 11.2, 12.9 | 18, 17 |
| Shrinkage @ 300°C (machine direction, cross direction) | % | 0.8, 0.0 | 1.5, 1.6 | 0.0, 0.0 |
| Dielectric Strength | V / mil | 525 | 550 | 685 |
| Dielectric Constant | @ 60 Hz | 1.80 | 2.60 | 3.50 |
| Dissipation Factor @ 60Hz | (x 10-3) | 6.0 | 12.0 | 7.0 |
| Thermal Conductivity @ 150°C | mWatt / m-k | 117.0 | 100.0 | 163.0 |
| Relative Temperature Index (electrical, mechanical), UL746B | °F | 428, 428 | 428, 428 | 428, 428 |
| Flammability Rating | UL94 | VTM-0, V-0 | V-0 | V-0 |