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Everything You Need to Know About PBO

Views: 0     Author: Site Editor     Publish Time: 2022-03-15      Origin: Site

PBO fiber is the abbreviation of poly-p-phenylene benzobisoxazole fiber. It is a reinforcing material for composite materials developed by the United States in the 1980s to develop the aerospace industry. PBO known as the super fiber of the 21st century.

Development History

PBO was invented by the aerodynamic development researchers of the US Air Force. First, the basic patent of polybenzoxazole was owned by the Stanford University Research Institute (SRI) and then authorized by the US Dow (DOW) Chemical Company. The industrial development of PBO has been carried out, and the original monomer synthesis method has been improved simultaneously. The new process has almost no isomer by-products, which improves the yield of synthetic monomers and lays the foundation for industrialization. 

In 1990, Toyobo Corporation of Japan purchased the PBO patented technology from the United States. 

In 1991, PBO fiber was developed by Daoyi Badish Chemical Fiber Company on the equipment of Toyobo Company in Japan, which significantly increased the strength and modulus of PBO fiber, reaching twice that of PPTA fiber. 

In 1994, Japan's Toyobo Co., Ltd. was approved by Daoyi Badish Chemical Fiber Co., Ltd., and invested a huge amount of 3 billion yen in building a 400-ton/year PBO monomer and a 180-ton/year spinning production line, and began to invest part of it in 1995. Mechanized production, the production capacity in 1998 reached 200 tons/year, and the trade name is Zylon. Japan's Toyobo remains the only company in the world that can commercially produce PBO fibers.

PBO Fiber Properties

According to Toyobo, its high-end PBO fiber products have a strength of 5.8GPa and a modulus of 280GPa, the highest among existing chemical fibers; the heat-resistant temperature reaches 600°C, the limiting oxygen index is 68, and it does not burn or shrink in flames. Heat resistance and flame retardancy are higher than any other organic fibers. Mainly used in heat-resistant technical textiles and fiber-reinforced materials.

The strength, modulus, heat resistance, and flame resistance of PBO fiber, especially the strength of PBO fiber, exceeds that of steel fiber and surpasses that of carbon fiber. In addition, PBO fiber has excellent impact resistance, friction resistance, dimensional stability, and is light and soft, making it an extremely ideal textile raw material.

As a super-performance fiber in the 21st century, PBO has excellent physical and mechanical properties and chemical properties. Its strength and modulus are twice that of Kevlar fiber, and it has the heat-resistant and flame-retardant properties of the meta-aramid fiber. The physicochemical properties completely exceed the Kevlar fibers that have been the leader in the field of high-performance fibers so far. A PBO filament with a diameter of 1 mm can lift a weight of 450 kg, and its strength is more than 10 times that of steel fiber.


The main characteristics of PBO fiber are good heat resistance, high strength, and modulus, so it is widely used.

(1) Filaments can be used as reinforcing materials for rubber products such as tires, tapes (conveyor belts), and hoses; reinforcing materials for various plastics and concrete; reinforcing components for ballistic missiles and composite materials; fiber optic cables protective film for tension members and optical cables; reinforced fibers for various soft wires such as heating wires and earphone wires; high tensile materials such as ropes and cables; heat-resistant filter materials for high-temperature filtration; missile and bullet protection equipment, bulletproof vests, Bulletproof helmets, and high-performance sailing suits; sports equipment such as tennis, speedboats, and rowing boats; advanced loudspeaker vibration plates, new communication materials; aerospace materials, etc.

(2) Chopped fiber and pulp can be used to reinforce fibers for friction materials and sealing gaskets, various resins, plastics for reinforcing materials, etc.

(3) Yarn can be used for fire-fighting clothing; furnace overalls, welding overalls and other heat-resistant overalls for molten metal processing; protective clothing, safety gloves, and safety shoes to prevent cuts; racing suits, rider suits; sportswear and active sports equipment; Carrace pilot suits; cut-resistant equipment, etc.

(4) Short fibers is mainly used for heat-resistant cushion felts for aluminum extrusion processing, etc.; heat-resistant filter materials for high-temperature filtration; thermal protection belts, etc.

PBO Felt Belt/Felt Tube Manufacturer

Calm is a professional PBO felt belts and felt tubes manufacturer with more than 20 years of experience. For any interest, please do not hesitate to contact us.

PBO Felt Tune Cover

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