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Polyaramid ( Polyparaphenylene terephthalamide )

Material Information

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We stock and supply the following standard forms:
Fabric Fiber
Fabric Fiber

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Common Brand Names:
DuPont™ Kevlar®, Twaron
 
General Description:  

General Description : An infusible, wholly aromatic polymer that can strictly be described as nylon T,T - but rarely is. Manufactured only as a fiber (by solution spinning), it has a very high thermal stability and temperature and flame resistance. In contrast to its chemical isomer Nomex®, its tensile properties are up to an order of magnitude greater than those of normal textile fibers, because of a high degree of molecular orientation resulting from its stiff linear molecules and their propensity for forming liquid crystals in the spinning solution. In common with the small number of other highly oriented materials, these fibers have a (small) negative CTE in the axial direction.

Quite widely used in composites which are lighter than those based on carbon fiber and electrically insulating. Their mechanical properties are generally inferior; more specifically they have a high specific tensile strength approaching that of carbon fiber composites, but quite low strength in compression. In addition to composites, applications include protective clothing and body armour, friction products, elastomer reinforcement (e.g. hoses and drive belts), ropes and cords and as high strength high modulus fabrics e.g. high performance sailcloths.

   

Chemical Resistance

Acids - concentrated Poor
Acids - dilute Fair
Alcohols Good
Alkalis Good-Poor
Aromatic hydrocarbons Good
Greases and Oils Good
Halogenated Hydrocarbons Good
Halogens Good
Ketones Good

Mechanical Properties

Tensile modulus ( GPa ) 59-124
Tensile strength ( MPa ) 2760

Physical Properties

Density ( g cm-3 ) 1.44
Resistance to Ultra-violet Fair
Water absorption ( % ) 3.5
Water absorption - equilibrium ( % ) 3.5

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) -2 along axis
Lower working temperature ( C ) -200
Specific heat ( J K-1 kg-1 ) 1400
Thermal conductivity @23C ( W m-1 K-1 ) 0.04
Upper working temperature ( C ) 180-245

Properties for Polyaramid Chopped Fiber

Property Value
Material Kevlar 29® Kevlar 49® Kevlar Ht (T129)
Density g cm-3 1.44 1.45 1.44
Extension to break % 3.7 1.9 3.6
Modulus GPa 58 120 75
Specific Modulus cN/tex 4000 8300 5200
Shrinkage @100C % 0.02
Specific Tenacity cN/tex 190 190 235

Properties for Polyaramid Fiber

Property Value
Material Kevlar 29® Kevlar 49® Kevlar Ht (T129)
Density g cm-3 1.44 1.45 1.44
Extension to break % 3.7 1.9 3.6
Modulus GPa 58 120 75
Specific Modulus cN/tex 4000 8300 5200
Shrinkage @100C % 0.02
Specific Tenacity cN/tex 190 190 235

Buy Polyaramid on-line

We stock and supply the following standard forms:
Fabric Fiber
Fabric Fiber

Choose a form to search our on-line catalog  

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