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Polybenzimidazole ( PBI )

Material Information

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Rod Sheet
Rod Sheet

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Common Brand Names:
Celazole
 
General Description:  

General Description : An infusible, black high performance polymer with a wholly aromatic molecule of high thermal stability. Semi-fabricated items are made, normally by the polymer manufacturer, by powder sintering processes.

It has excellent high temperature properties - probably on balance the best of any commercially available polymer - and is very expensive. It is strong, stiff, very hard, has a particularly high strength in and recovery from compression and a CTE similar to that of aluminum. It has good chemical resistance resisting many harsh chemical environments better than many other high performance polymers, but is attacked by polar aprotic solvents and, at elevated temperatures, by strong aqueous acids and (to a lesser extent) alkalis. Despite absorbing (slowly) a high percentage of water at saturation, it is stable to hydrolysis and resists high pressure steam.

   

Chemical Resistance

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

Electrical Properties

Dielectric constant @1MHz 3.2
Dielectric strength ( kV mm-1 ) 21
Volume resistivity ( Ohmcm ) 8x1014

Mechanical Properties

Coefficient of friction 0.19-0.27
Compressive modulus ( GPa ) 6.2
Compressive strength ( MPa ) 400
Elongation at break ( % ) 3
Hardness - Rockwell K115
Izod impact strength ( J m-1 ) 590 unnotched
Poisson's ratio 0.34
Tensile modulus ( GPa ) 5.9
Tensile strength ( MPa ) 160

Physical Properties

Density ( g cm-3 ) 1.3
Flammability Does not burn
Limiting oxygen index ( % ) 58
Radiation resistance Good
Water absorption - over 24 hours ( % ) 0.4

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 23
Heat-deflection temperature - 0.45MPa ( C ) 435
Thermal conductivity @23C ( W m-1 K-1 ) 0.41
Upper working temperature ( C ) 260-400
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Polybenzimidazole on-line

We stock and supply the following standard forms:
Rod Sheet
Rod Sheet

Choose a form to search our on-line catalog  

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