Apexazole® PBI (Polybenzimidazole) Fiber

Apexazole® PBI (polybenzimidazole) fiber is currently the organic high-performance fiber with the most outstanding overall performance. Thanks to its exceptional heat resistance, flame retardancy, chemical resistance, and mechanical properties, it is widely used in extreme‑environment applications such as aerospace, fire‑protection gear, high‑temperature filtration, and nuclear, biological, and chemical (NBC) protection.

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Product Details

Apexazole® PBI (polybenzimidazole) fiber is currently the organic high-performance fiber with the most outstanding overall performance. Owing to its exceptional heat resistance, flame retardancy, chemical resistance, and mechanical properties, it is widely used in extreme‑environment applications such as aerospace, fire‑protection, high‑temperature filtration, and nuclear, biological, and chemical (NBC) protection.

Outstanding properties of PBI fiber:

High-temperature resistance: It can be used continuously at temperatures below 400°C, with a short-term temperature resistance of up to 500°C.
Flame retardancy: It is non‑combustible in air, burns slowly in oxygen, and self‑extinguishes when removed from the flame.
Chemical stability: Resistant to corrosion by strong acids, strong bases, and organic solvents.
Mechanical Properties: It exhibits high tensile strength, moderate elongation, and excellent textile properties.
Hygroscopicity: The moisture absorption rate is approximately 15%, higher than that of cotton, offering a pleasant hand feel and comfortable wear.
Radiation resistance: It exhibits excellent resistance to radiation such as ultraviolet and gamma rays.
Self-lubricity: It possesses excellent self-lubricating properties.
Low smoke toxicity: It produces fewer toxic gases during combustion and boasts high safety.

Application areas

Aerospace: Thermal protection materials for rockets and missiles, thermal insulation layers for spacecraft
Military Industry and National Defense: Body armor, bulletproof helmets, combat boots, military uniforms, and more
Fire Protection: Firefighting suits, heat-resistant gloves, fire blankets, and more
Industrial Protection: High-temperature workwear, welding protection, and chemical protection
Environmental purification: High-temperature filter bags, dust removal equipment
Electrical insulation: High-temperature-resistant insulating material

Product Specifications

Main performance parameters of Apexazole® PBI (polybenzimidazole) fiber

Project	Indicator
Appearance	Golden-yellow fiber
Density	1.43 g/cm³
Tensile strength (long fibers)	39.7–43.2 cN/dtex
Tensile strength (short fibers)	27.4 cN/dtex
Elongation (long fibers)	23%–24%
Elongation (short fibers)	30%
LOI value (Limiting Oxygen Index)	>50%
Thermal stability (long-term)	Approximately 310°C (in air)
Temperature resistance (short-term)	Up to 500°C
Thermal decomposition temperature	>450°C
Moisture absorption rate	Approximately 15%
Chemical resistance	Resistant to strong acids, strong bases, and organic solvents.
Flame retardancy	Non-flammable in air; self-extinguishing when removed from the flame.
Radiation stability	It exhibits excellent stability against ultraviolet and gamma radiation.

Performance Metrics	PBI fiber	Meta-aramid	Para-aramid	Polyimide	PBO
Long-term temperature resistance	~310°C	200°C	250°C	260°C	300°C
Short-term temperature resistance	500°C	250°C	300°C	400°C	450°C
Limiting Oxygen Index (LOI)	>50%	28-32%	25-30%	36-40%	68%
Tensile strength (cN/dtex)	39.7-43.2	22-27	190-230	30-40	37-42
Flame retardancy	excellent	Good	middle	Good	excellent
Chemical resistance	excellent	middle	Good	excellent	Good
Radiation resistance	excellent	middle	middle	Good	middle
Moisture absorption rate	15%	4-5%	3.5%	2-3%	2%
Textile processability	Good	excellent	excellent	middle	middle
Price	High	middle	Middle and high	High	Very high

Radiation-protective properties of PBI fiber
Ultraviolet radiation, gamma rays (γ-rays), X-rays, neutron radiation

Type of radiation	Radiation dose	Strength retention rate	Elongation retention rate
Ultraviolet rays	1,000 hours of irradiation	>90%	>85%
Gamma rays	100 kGy	>85%	>80%
Gamma rays	500 kGy	>70%	>65%
Electron beam	1000 kGy	>75%	>70%
X-ray	500 kGy	>80%	>75%

Radiation shielding application areas

Nuclear Industry Protection: Protective suits for nuclear power plant operators, nuclear waste treatment equipment
Medical Radiation Protection: Protective clothing for hospital radiologists and equipment for X-ray room operators
Aerospace: Spacecraft instrumentation protection, astronaut extravehicular activity suits
Military applications: Nuclear, Biological, and Chemical Protective Suits; Protective Gear for Strategic Weapons Operators
Security Inspection Field: Radiation Protection for Airport and Port Security Personnel
Research Laboratory: Personal Protective Equipment for Radioactive Laboratory Personnel