Nomex® Type 414 High Density
Nomex® Type 414 is designed for applications requiring a strong, yet flexible and conformable sheet. It is electrically and thermally similar to Nomex® Type 410, but is calendered under different conditions to provide its unique properties, and is produced in five thicknesses from 0.09 mm to 0.38 mm (3.4 mil to 15 mil) with a density from 0.9 to 1.0. Type 414 was designed for use as slot insulation in hand-wound motors and for linear wrapping of wire.
Key Properties
- Tensile Strength (0.25 mm/10 mil): MD 229 N/cm, XD 119 N/cm — ASTM D828
- Elongation (0.25 mm/10 mil): MD 13%, XD 16% — ASTM D828
- Dielectric Strength, AC Rapid Rise (0.25 mm/10 mil): 740 V/mil (29 kV/mm) — ASTM D149
- Temperature Resistance: Recognized 220°C insulating material; reacts similarly to temperature changes up to 220°C as Type 410
- Thickness Range: 0.09–0.38 mm (3.4–15 mil), 5 standard grades — ASTM D374
- Density (0.25 mm/10 mil): 0.95 g/cc
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- Specifications
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Electrical Properties (0.25 mm/10 mil)
| Property | Value | Test Method |
| Dielectric Strength, AC Rapid Rise | 740 V/mil (29 kV/mm) | ASTM D149 |
| Full Wave Impulse | 1,300 V/mil (51 kV/mm) | ASTM D3426 |
| Dielectric Constant at 60 Hz | 2.7 | ASTM D150 |
| Dielectric Constant at 1 kHz | 2.7 | ASTM D150 |
| Dissipation Factor at 60 Hz | 8 x10⁻³ | ASTM D150 |
Mechanical Properties (0.25 mm/10 mil)
| Property | Value | Test Method |
| Typical Thickness | 10.5 mil (0.27 mm) | ASTM D374 |
| Basis Weight | 252 g/m² | ASTM D646 |
| Density | 0.95 g/cc | — |
| Tensile Strength, MD | 229 N/cm | ASTM D828 |
| Tensile Strength, XD | 119 N/cm | ASTM D828 |
| Elongation, MD | 13% | ASTM D828 |
| Elongation, XD | 16% | ASTM D828 |
| Initial Tear Strength, MD | 73 N | ASTM D1004 |
| Initial Tear Strength, XD | 38 N | ASTM D1004 |
| Fold Endurance, MD | 7,700 cycles | ASTM D2176 |
Environmental Performance (0.25 mm/10 mil)
| Property | Value | Test Method |
| Limiting Oxygen Index at Room Temperature | 27–32% (depending on thickness and density) | ASTM D2863 |
| Volume Resistivity at 96% RH | 10¹⁴ ohm·cm | ASTM D257 |
| Dissipation Factor at 96% RH, 1 Hz | 26 x10⁻³ | ASTM D150 |
| Tensile Strength Retention at 96% RH, MD | 214 N/cm | ASTM D828 |
Compliance
- 220°C Insulating Material Recognition — Compliant (based on Nomex® thermal aging data)
- Slot insulation in hand-wound motors
- Linear wrapping of wire
- Folded or punched insulation parts
- Sheet insulation in fluid-filled transformers
- Turn and layer insulation requiring flexibility and conformability
Common industries: electric motor manufacturing, transformer manufacturing.
Nomex® Type 414 is designed for applications requiring a strong yet flexible and conformable sheet. It is electrically and thermally similar to Nomex® Type 410, differing only in the calendering conditions used to produce it, and was designed for use as slot insulation in hand-wound motors and for linear wrapping of wire. It is also used in folded or punched parts and as sheet insulation in fluid-filled transformer applications, owing to its improved impregnability compared to Type 410.
Type 414 exhibits good fold endurance — at least double the values of Type 410 at the same thickness — and its dimensional and electrical properties change only modestly with humidity exposure: dielectric strength and tensile strength are retained at 96% relative humidity, and its Limiting Oxygen Index ranges between 27% and 32% at room temperature depending on thickness and density. Since Type 414 is identical in composition and similar in structure to Type 410, its flammability characteristics are also similar.
Compliant with recognition as a 220°C insulating material, based on Nomex® thermal aging data.
What differentiates Nomex® Type 414 from Nomex® Type 410?
Type 414 is calendered under different conditions than Type 410 to deliver a strong, yet flexible and conformable sheet with fold endurance at least double that of Type 410 at the same thickness, while remaining electrically and thermally similar.
Why does tensile strength matter for film selection?
Type 414's tensile strength (up to 341 N/cm MD at 15 mil) allows it to withstand the folding, punching, and wire-wrapping stresses typical of hand-wound motor slot insulation without tearing.
What is the operating temperature range for Nomex® Type 414?
Nomex® Type 414 is recognized as a 220°C insulating material and reacts similarly to temperature changes up to 220°C as Type 410, owing to its identical chemical composition.
Is Nomex® Type 414 suitable for regulated electrical environments?
Nomex® Type 414 is recognized as a 220°C insulating material based on Nomex® thermal aging data; no additional UL standard numbers are specified on the manufacturer's TDS for this grade.
How should Nomex® Type 414 be specified?
Specify grade (Nomex® Type 414), thickness, compliance requirements, dimensional tolerances, and finished format.
