CF PBT Polyester

Carbon Fiber Polybutylene terephthalate CF PBT Polyester

With the continuous strengthening of the trends of light weighting of automobiles, miniaturization of electronic and electrical components, and high-strength requirements for high-end industrial parts, material technology is facing greater challenges. Long Carbon Fiber PBT Polyester, thanks to its outstanding comprehensive performance, is gradually becoming an important member in the field of engineering plastics and high-performance composite materials. It combines the high strength and high modulus of long carbon fibers with the chemical resistance, low water absorption, and good processing properties of PBT polyester, and demonstrates unique value in multiple fields such as automobiles, electronics, and industrial equipment.

Product Definition of CF PBT Polymer

PBT (Polybutylene Terephthalate) is a highly performing thermoplastic polyester with excellent chemical resistance, dimensional stability and electrical properties. It is widely used in the engineering plastics field. Long carbon fibers are high-performance reinforcing fibers with a length typically over 5mm, featuring extremely high strength-to-weight ratio, extremely low thermal expansion coefficient and excellent fatigue durability.
The long carbon fiber reinforced PBT polyester (Long Carbon Fiber PBT Polyester) compound resin formed by combining long carbon fibers with PBT polyester is produced through advanced long fiber impregnation and injection molding processes. This enables the carbon fibers to maintain a high length and uniform distribution within the resin matrix, thereby maximizing the mechanical properties of the carbon fibers.

Core Performance Advantages

1. High strength and high rigidity
The long carbon fibers formed a three-dimensional reinforced framework structure in the PBT matrix, significantly enhancing the tensile strength, bending strength and impact strength of the material. Compared with the traditional short fiber reinforced PBT, the strength of the long carbon fiber version has been improved, and the rigidity has increased even more significantly. It can replace some metal structural components and contribute to lightweight design.
2. Excellent dimensional stability
The thermal expansion coefficient of carbon fiber is extremely low. When combined with the PBT matrix, the long carbon fiber reinforced PBT polyester still maintains a stable shape in high-temperature environments and is not prone to warping or deformation. It is particularly suitable for mechanical parts and electronic component housings that require high precision dimensions.
3. High heat resistance and thermal aging performance
The addition of long carbon fibers not only improves the thermal conductivity of the material, facilitating rapid heat dissipation, but also enhances the structural stability of PBT in high-temperature environments. Its heat distortion temperature (HDT) can reach above 200℃, making it suitable for components in engine compartments and near heat sources, etc., in high-temperature conditions.
4. Chemical Resistance and Corrosion Resistance
The PBT polyester itself has excellent chemical resistance to acids, alkalis, oils, fuels, etc. After being reinforced with long carbon fibers, this property is maintained or even enhanced, enabling the material to be used for a long time in corrosive environments such as automotive fuel systems and chemical equipment.
5. Low water absorption rate
The water absorption rate of long carbon fiber PBT polyester is much lower than that of engineering plastics such as nylon. Under humid and hot conditions, the mechanical properties change little, ensuring the long-term stable physical dimensions and electrical properties of the product.
6. Excellent electrical insulation performance

In the field of electronics and electrical engineering, long carbon fiber reinforced PBT still maintains excellent insulation properties and arc resistance, making it suitable for high-demand components such as connectors and switch housings.

Typical Application Fields of Carbon fiber PBT

Automotive industry

Engine compartment structural components (air filter housing, fan blades, engine cover plate)
Automotive interior frame components (instrument panel bracket, seat frame)
High-strength connection components (safety belt anchor, bumper support)

Electrical and electronic

High-precision connectors and terminal brackets
Electrical equipment enclosures and structural components
Electric tools and household appliance parts

Industrial equipment

Mechanical components (gears, shaft sleeves, pump casings)
Chemical anti-corrosion parts (valves, sealing seats) High-performance sports equipment (bicycle parts, drone components)

Processing and shaping advantages

 Long fiber impregnation technology: Through the advanced pre-impregnation process of long carbon fibers, the fibers are evenly distributed in the resin and their lengths are fully retained, thereby maximizing the reinforcing effect.
 Injection molding and compression molding are compatible: Long carbon fiber reinforced PBT can be processed using traditional injection molding equipment, and large and complex structural components can also be fabricated through compression molding, with flexible processes.
 Excellent surface quality: Despite containing long fibers internally, thanks to the good fluidity of the PBT matrix, the surface of the product remains smooth, making it easy for painting, printing or laser marking.
 Color and functional customization: By adding heat-resistant pigments, UV-resistant agents or flame-retardants, different colors and functional requirements can be achieved, meeting the design needs of various industries and consumer products.

Click the button below and join our materials experts to discuss this excellent material together.

Contact With Material Expert