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Polyaramid ( Polymetaphenylene isophthalamide )

Material Information

Buy Polyaramid on-line

We stock and supply the following standard forms:
Chopped Fiber Fiber Film Honeycomb Sheet
Chopped Fiber Fiber Film Honeycomb Sheet

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Common Brand Names:
DuPont ™ Nomex®
 
General Description:  

General Description : An infusible, wholly aromatic polymer that can strictly be described as nylon I,I - 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 Kevlar®, its tensile properties are similar to those of normal textile fibers but its hydrolysis resistance in hot wet conditions is better (than Kevlar's). Its radiation resistance is also very good.

The fiber is converted into a number of fiber-based forms, of which the following are available from Goodfellow's stock : calendered and uncalendered papers, pressboards of three different densities and honeycomb. The last is made from Nomex® paper coated in a phenolic resin. Other forms, eg felts, can be available as special orders.

Applications include protective clothing (e.g. for firefighters and racing drivers), process equipment and insulation and filtration media.

Explanation of Type numbers


T410 Calendered Paper
T411 Un-calendered Paper
T418 Calendered Paper, containing 50% mica
T992 Low Density Pressboard
T993 Medium Density Pressboard
T994 High Density Pressboard

   

Chemical Resistance

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

Electrical Properties

Dielectric constant @1kHz 2.3
Dielectric strength ( kV mm-1 ) 32
Volume resistivity ( Ohmcm ) 6x1016

Mechanical Properties

Elongation at break ( % ) <9
Izod impact strength ( J m-1 ) 533 unnotched
Tensile strength ( MPa ) 1800-3900

Physical Properties

Density ( g cm-3 ) 1.38
Limiting oxygen index ( % ) 29
Radiation resistance Good
Water absorption - equilibrium ( % ) 9
Water absorption - over 24 hours ( % ) 0.08

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 20
Heat-deflection temperature - 1.8MPa ( C ) 149
Specific heat ( J K-1 kg-1 ) 1200
Thermal conductivity @23C ( W m-1 K-1 ) 0.13
Upper working temperature ( C ) 200 - 300

Properties for Polyaramid Chopped Fiber

Property Value
Density g cm-3 1.38
Extension to break % 16 - 25
Specific Modulus cN/tex 1100
Specific Tenacity cN/tex 35 - 44

Properties for Polyaramid Fiber

Property Value
Density g cm-3 1.38
Extension to break % 16 - 25
Specific Modulus cN/tex 1100
Specific Tenacity cN/tex 35 - 44

Properties for Polyaramid Film

Property Value
Material T410 T411 T418
Density g cm-3 0.72-1.05 0.3 1.1
Dielectric Constant @ 60Hz 1.6 - 3.4 1.2 2.5
Dielectric Strength @130µm thick kV mm-1 17-55 9-18 33-63
Dissipation Factor @60Hz 0.004-0.007 0.003 0.003
Elmendorf Tear Strength N mm-1 14-39 7 14-22
Extension to break - Longitudinal % 11-22 3 2.5
Extension to break - Transverse % 8-17 5 2.5
Initial Tear Strength g µm-1 12-32 2-4 6-10
Limiting Oxygen Index % 29-32 29 63
Shrinkage @300C % 0.3-2 0.2-0.3
Tensile strength - Longitudinal MPa 85-130 6 40
Tensile strength - Transverse MPa 35-75 3 30
Thermal Conductivity @23C W m-1 K-1 0.1-0.16

Properties for Polyaramid Honeycomb

Property Value
Cell Size mm 6 5 3 5
Compressive Strength MPa 0.7 1.1 2.2 3.8
Core Density g cm-3 0.024 0.032 0.048 0.064
Plate Shear Modulus - Longitudinal MPa 25 34 52 70
Plate Shear Modulus - Transverse MPa 14 20 29 35
Plate Shear Strength - Longitudinal MPa 0.7 1.1 1.8 2.5
Plate Shear Strength - Transverse MPa 0.35 0.6 0.9 1.1
Wall Thickness mm 0.05 0.05 0.05 0.08

Properties for Polyaramid Sheet

Property Value
Material T992 T993 T994
Density g cm-3 0.5 0.83 1.14
Dielectric Constant @ 60Hz 1.7 ~3.5 ~4.4
Dielectric Strength @3mm thick kV mm-1 15-32 ~33-66 ~25-70
Dissipation Factor @60Hz 0.02 ~0.09 ~0.02
Extension to break - Longitudinal % 3 5.5
Extension to break - Transverse % 4 7
Limiting Oxygen Index % 29 32
Tensile strength - Longitudinal MPa 14.5 56 120
Tensile strength - Transverse MPa 11 32 70
Thermal Conductivity @23C W m-1 K-1 0.07

Buy Polyaramid on-line

We stock and supply the following standard forms:
Chopped Fiber Fiber Film Honeycomb Sheet
Chopped Fiber Fiber Film Honeycomb Sheet

Choose a form to search our on-line catalog  

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