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Formula: PBI
Form: Foil/Film/Sheet
Material: Polybenzimidazole (PBI)
Commodity: Polymers
Polybenzimidazole Film offers exceptional thermal stability, flame resistance, and chemical inertness in a thin, flexible format ideal for insulating and barrier applications in extreme environments. Its high glass transition temperature and excellent dielectric properties make it suitable for aerospace thermal shields, high-temperature electrical insulation, and chemically resistant membranes. The film form allows precise control over thickness for use in protective layers for circuit boards, fuel cell membranes, and flexible thermal barriers in engines. Research employs PBI films in advanced polymer composite development, durability testing under combined heat and chemical stress, and next-generation high-temperature filtration systems. Combining flexibility with extreme environmental tolerance, PBI film is a critical choice where both conformability and top-tier thermal and chemical performance are essential.
Tolerances
Foil/Film/Sheet
| Thickness | ±20% |
|---|
Material Properties for Polymers
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Poor |
| Acids - dilute | Fair-Poor |
| Alcohols | Good |
| Alkalis | Good-Poor |
| Aromatic hydrocarbons | Good |
| Greases and Oils | Good |
| Halogenated Hydrocarbons | Good |
| Ketones | Good |
Mechanical Properties
| Element | Value |
|---|---|
| Coefficient of friction | 0.19-0.27 |
| Hardness - Rockwell | K115 |
| Poisson's ratio | 0.34 |
| Elongation at break( % ) | 3 |
| Compressive modulus( GPa ) | 6.2 |
| Tensile modulus( GPa ) | 5.9 |
| Izod impact strength( J m⁻¹ ) | 590unnotched |
| Tensile strength( MPa ) | 160 |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant @1MHz | 3.2 |
| Dielectric strength( kV mm⁻¹ ) | 21 |
| Volume resistivity( Ohmcm ) | 8x10¹⁴ |
Physical Properties
| Element | Value |
|---|---|
| Flammability | Does not burn |
| Radiation resistance | Good |
| Limiting oxygen index( % ) | 58 |
| Water absorption - over 24 hours( % ) | 0.4 |
| Density( gcm⁻³ ) | 1.3 |
Thermal Properties
| Element | Value |
|---|---|
| Heat-deflection temperature - 0.45MPa( C ) | 435 |
| Upper working temperature( C ) | 260-400 |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 0.41@23°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 23 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 400 |
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