Type: Man-made fibres | Classification: Organic | Sub-classification: Synthetic fibre

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Fibre structure & physical properties

Fibre composition:


Diameter: Can be made to any diameter
Very fine: < 10 μm, Fine: < 20 μm, Medium: 20-50 μm, Course: > 50 μm

Length: Filament

Staple length: continuous filament
short < 26 mm, medium 26-29 mm, long: 30-38 mm, extra long: 39 mm and over

Natural fibre colour: Yellow colour

Microscopic Images (Cross sectional and SEM):

Image source: Caption:

It’s cross section determined by the spinneret. Usually cylindrical, but can be made tri-lobal, tetra, hexa or octagon

(CC) Sebastian Nordstrom
(CC) Sebastian Nordstrom
(CC) Sebastian Nordstrom
(CC) Sebastian Nordstrom


Surface is undistinguishable, showing not characteristic markings.

Fibre properties (Mechanical, Chemical and Thermal)

Mechanical Properties

Tensile strength (cN/dtex) :

Chemical Properties

Hydrophobicity: Hydrophobic

Moisture regain (%): 7%

Thermal Properties

Flammability: Can be ignited at high tempatures (over 450 degrees) but burning usually stops when the heat source is removed.

Sustainability considerations

End uses

Apparel: high performance textiles. Heat and flame resistant textiles.


How Its Made Carbon Fibre [5m 1s]
Kevlar Fibers Are Put To The Test [2m 41s]
Kevlar Cut Resistance Demonstration [3m 32s]

Materials using this fibre

Additional resources

Taylor MA, 2004. Technology of Textile Properties. Third edition. Forbes Publications, London, UK.

Zhong Z and Xiao C, 2008. Fabric composition and testing. In: Fabric Testing. Ed: Hu, J. Woodhead Publishing Limited, Cambridge, UK.

ISO/TR 11827:2012 Textiles — Composition testing — Identification of fibres.

Houck, Max M. Identification of Textile Fibers. Cambridge : Boca Raton: Woodhead Pub. in Association with The Textile Institute ; CRC, 2009. Print.