DuPont™ Nomex® N301 Nomex® Aramid Staple Fiber
Categories: Other Engineering Material; Composite Fibers; Polymer; Thermoset; Aramid

Material Notes:

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. Uses for staple, yarn, and spunlaced fabrics include apparel fabrics to protect against flash fire and electric arcs exposure; firefighter garments; fabrics and spun yarns for filtration applications; insulation in fire resistant thermal protective apparel; rubber reinforcement; and in transportation textiles such as airline carpeting. 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. The fiber's low stiffness and high elongation give it textile-like characteristics which allow processing on conventional textile equipment.

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.

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Physical PropertiesMetricEnglishComments
Moisture Absorption at Equilibrium 4.5 %4.5 %Billed (Commercial, ASTM)
 8.3 %8.3 %fiber as shipped
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 340 MPa49300 psiCalculated from tenacity
Elongation at Break 19 %19 %Filament yarn tested at 3 TPI, 10" gauge length and 60%/minute extension rate. DuPont Test Method 12002.
Tenacity 0.247 N/tex2.80 g/denierStraight test - filament yarn tested at 3 TPI, 10 inch gauge length and 60%/min extension rate. DuPont Test Method 12002
Thermal PropertiesMetricEnglishComments
CTE, linear 18.0 µm/m-°C
@Temperature 20.0 °C
10.0 µin/in-°F
@Temperature 68.0 °F
Specific Heat Capacity 1.20 J/g-°C0.287 BTU/lb-°FModulated DSC, ASTM TM E1269.

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