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DuPont™ Nomex® 418 Paper, 14 mil Nominal Thickness

Category Other Engineering Material , Composite Fibers , Polymer , Film , Thermoset , Aramid
Manufacturer DuPont
Trade Name Nomex®
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF DuPont™ Nomex® 418 Paper, 14 mil Nominal Thickness.pdf
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Material Notes:
Nomex® Type 418 is designed for high-voltage applications such as motor conductor and coil wrap, transformer ground and layer insulation. It can be readily impregnated with varnishes. This calendared blend of aramid with mica offers improved voltage endurance over Type 410 when subjected to corona attack.General NOMEX Information: Nomex® is a family of aromatic polyamide (aramid) fibers. This family consists of staple fibers, continuous filament yarns, paper, and spunlaced fabrics. The paper is produced from two forms of the aramid polymer. Small fibrous binder particles (fibrids) derived directly from the polymer under high shear conditions are mixed with short fibers (floc) which are cut to length from a fiber filament. The floc and fibrids are combined in a water based slurry from which a continuous sheet is produced on a specialized papermaking machine. This initial paper (as in Type 419) is low density and has poor properties. Subsequent densification and internal bonding is achieved by high temperature calendaring. The resulting paper is mechanically strong and has good electrical properties. Some uses for paper product include insulation in electric motors and transformers, wire wrapping, and honeycombed strength members in many aircraft. Nomex® brand fibers are inherently flame resistant: the flame resistance is a polymer property and does not diminish with the life of the fiber.Nomex® meta-aramid, poly(meta-phenyleneisophthalamide), is prepared from meta-phenylenediamine and isophthaloyl chloride in an amide solvent. It is a long chain polyamide in which at least 85% of the amide linkages are attached directly to two aromatic rings. The meta oriented phenylene forms bends in the polymer chain, reducing chain rigidity as compared to the para orientation in the chemically similar Kevlar® chain. This flexible polymer chain gives Nomex® more textile-like qualities while retaining high temperature properties similar to Kevlar®.Information provided by DuPont.
Physical Properties Metric English Comments
Bulk Density 1.12 g/cc
0.0405 lb/in³
Density 1.12 g/cc
0.0405 lb/in³
Thickness 356 microns
14.0 mil
Nominal
356 microns
14.0 mil
Typical; ASTM D374
Mechanical Properties Metric English Comments
Film Elongation at Break, MD 3.0 %
3.0 %
ASTM D828
Film Elongation at Break, TD 3.5 %
3.5 %
ASTM D828
Tear Strength, Total 21.0 N
4.72 lb (f)
Initial in TD; ASTM D1004
38.0 N
8.54 lb (f)
Initial in MD; ASTM D1004
Elmendorf Tear Strength, MD 1.69 g/micron
43.0 g/mil
Calculated from mfr's report of 5.9 N per TAPPI-414 and the typical thickness
Elmendorf Tear Strength, TD 2.24 g/micron
57.0 g/mil
Calculated from mfr's report of 7.8 N per TAPPI-414 and the typical thickness
Film Tensile Strength at Break, MD 41.9 MPa
6080 psi
Calculated from mfr's report of 149 N/cm per ASTM D828 and the typical thickness
Film Tensile Strength at Break, TD 28.7 MPa
4160 psi
Calculated from mfr's report of 102 N/cm per ASTM D828 and the typical thickness
Thermal Properties Metric English Comments
Maximum Service Temperature, Air 220 °C
428 °F
Electrical insulation
Shrinkage, MD 0.30 %
0.30 %
at 300°C
Shrinkage, TD 0.20 %
0.20 %
at 300°C
Electrical Properties Metric English Comments
Volume Resistivity 1.00e+14 ohm-cm
1.00e+14 ohm-cm
50% RH; ASTM D257
1.00e+15 ohm-cm
1.00e+15 ohm-cm
Dry; ASTM D257
Surface Resistivity per Square 1.00e+13 ohm
1.00e+13 ohm
50% RH; ASTM D257
1.00e+15 ohm
1.00e+15 ohm
Dry; ASTM D257
Dielectric Constant 2.1

@Frequency 60 Hz
2.1

@Frequency 60 Hz
Dry; ASTM D150
3.4

@Frequency 60 Hz
3.4

@Frequency 60 Hz
50% RH; ASTM D150
Dielectric Strength 36.2 kV/mm
919 kV/in
AC Rapid Rise; ASTM D149
59.0 kV/mm
1500 kV/in
Full-wave Impulse; ASTM D3426
Dissipation Factor 0.0050

@Frequency 60 Hz
0.0050

@Frequency 60 Hz
Dry; ASTM D150
0.15

@Frequency 60 Hz
0.15

@Frequency 60 Hz
50% RH; ASTM D150
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