Chopped PBI
PBI (polybenzimidazole) fiber is an advanced high-performance fiber known for exceptional thermal stability, inherent flame resistance, and outstanding chemical resistance. With one of the highest limiting oxygen index (LOI) values of any organic fiber, PBI will not melt, drip, or support combustion, making it ideal for high-heat and flame-exposure environments.
In addition to its thermal performance, PBI offers excellent strength retention at elevated temperatures and long-term durability in harsh industrial conditions, maintaining integrity where most organic fibers rapidly degrade.
Rocket-Fibers’ PBI fibers are manufactured in the United States and are available in precision-cut lengths and continuous filament forms to support a wide range of applications—from protective textiles and filtration media to high-temperature composites and specialty industrial uses. Our PBI offerings support Berry Amendment compliance for U.S. Department of Defense and related programs when documentation is requested. Batch-level Certificates of Analysis (COA), including full lot traceability, are available upon request.
About This Item
PBI Resistance Guide
PBI (polybenzimidazole) fiber offers exceptional thermal stability and inherent flame resistance, making it one of the most heat-resistant organic fibers available. It does not melt or drip and maintains mechanical integrity at elevated temperatures. PBI also provides strong chemical resistance and excellent long-term durability in extreme environments. However, like most high-performance organic fibers, it can degrade under prolonged UV exposure.
This fiber will slowly degrade with long term exposure to UV light.
Acid: Excellent resistant to most acids
Alkali: Good resistance to most alkalis
Organic Solvent: Generally compatible with a variety of organic solvents.
Continuous Operating Temperature Range (°C): 260
Short Term Exposure (°C): 400+
Melt Temperature (°C): N/A
Chopped PBI Technical Specifications
Length
(mm) |
Moisture |
Tenacity (g/d) |
Denier Per Filament
|
|---|---|---|---|
3.0 | 11.8 % - 19.8 % | 2.30 - 2.70 | 1.25 - 1.75 |
6.0 |
11.8 % - 19.8 % | 2.30 - 2.70 | 1.25 - 1.75 |
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Product Details
Made in the USA from premium polybenzimidazole (PBI) fiber
Berry Amendment compliant
Precision chopped to 3 mm (1/8") or 6 mm (1/4") standard lengths
Custom cut lengths available upon request
Supplied clean & binder-free
Natural golden-brown color
Packaging & Quantity
Product Performance
Inherently flame resistant — will not melt, drip, or support combustion, even under direct flame exposure.
Retains mechanical strength at temperatures where most organic fibers rapidly degrade.
Features an exceptionally high Limiting Oxygen Index (LOI), requiring elevated oxygen levels to sustain combustion.
Delivers outstanding thermal stability and dimensional retention in continuous high-heat environments.
Resists chemical exposure and long-term thermal aging.
Improves composite heat resistance, char stability, and structural performance without significant weight gain.
PBI Property Guide
The table below represents the nominal mechanical properties of PBI. PBI fibers are precision cut to different lengths, optimized for specific products and applications.
| Property | Unit Of Measure | Data |
|---|---|---|
| DPF | denier | 1.5 |
| Tenacity | g/d | 2.7 |
| Breaking Elongation | % | 27.0% |
| Finish Level | % | 0.35% |
| Initial Modulus | g/d | 45 |
| Specific Gravity | g/cm3
|
1.4 |
| Moisture Regain | % | 15.0% |
| Limiting Oxygen Index | % | >41.0% |
| Hot Air Shrinkage | % | < 1.0% |
| Specific Heat | BTU/lb. F | 0.30 |
| Surface Area Resistivity | ohms/square | 1xE10 |
| Thermal Conductivity | BTU/hr.ft.F | 0.022 |
Suggested Applications
Aerospace and defense composite reinforcement
Thermal barrier and heat-shield materials
Fire-resistant industrial insulation
High-temperature filtration media
Protective textile and safety reinforcement
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