Polyaramid Fibre / Vinylester Matrix Composite - Properties - Supplier Data by Goodfellow

Polyaramid fiber is 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) and is characterized by high thermal stability, temperature, and flame resistance.

Contrary to its chemical isomer DuPont™ Nomex®, the tensile properties of polyaramid fiber are up to an order of magnitude greater than those of regular textile fibres. This is due to a high degree of molecular orientation that results from its stiff linear molecules and their tendency for forming liquid crystals in the spinning solution.

Similar to the small number of other highly oriented materials, these fibres have a (small) negative CTE in the axial direction.

Polyaramid fiber is extensively used in composites which are lighter than those based on and carbon fiber and are electrically insulating. The mechanical properties of the polyaramid fiber are usually inferior; particularly if they have a high specific tensile strength closer to that of carbon fiber composites, but relatively low strength in compression.

In addition to composites, applications of polyaramid fiber include body armour and protective clothing, elastomer reinforcement, friction products (for example, hoses and drive belts), cords and ropes and as high strength high modulus fabric for example high performance sailcloths.

Provided below are properties for a polyaramid fibre reinforced vinylester matrix, polymer matrix composite.

Key Properties

The key properties of polyaramid fibre reinforced vinylester matrix are tabulated below.

Table 1. Key properties

Thermal Properties
Lower working temperature ( °C ) -50
Upper working temperature (°C ) 80
Properties Polyaramid/Vinylester Composite Tube
Property Value
Compressive Strength - Longitudinal MPa 100-300
Density g.cm-3 1.2-1.4
Flexural modulus - Longitudinal GPa 17-22
Flexural strength - Longitudinal MPa 150-250
Tensile strength - Longitudinal MPa 800-1000
Ultimate Tensile Strain - Longitudinal % 2.5
Volume fraction of fibres % 50-60
Properties Polyaramid/Vinylester Composite Rod
Property Value
Compressive Strength - Longitudinal MPa 100-300
Density g.cm-3 1.2-1.4
Flexural modulus - Longitudinal GPa 17-22
Flexural strength - Longitudinal MPa 150-250
Tensile strength - Longitudinal MPa 800-1000
Ultimate Tensile Strain - Longitudinal % 2.5
Volume fraction of fibres % 50-60

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