With the widespread application of high-performance engineering plastics in complex working conditions, the limitations of standard PTFE (polytetrafluoroethylene) materials are becoming increasingly apparent. Although single PTFE has excellent chemical stability and low friction performance, its natural low hardness, high creep and easy wear characteristics limit its performance in high-load, high-temperature, high-speed motion environments.
The addition of fillers and additives can significantly improve the mechanical properties of PTFE, especially creep and wear rate. Commonly used fillers are steel, carbon, glass fiber, carbon fiber, graphite, bronze, steel, etc.
Glass fiber: Its addition will improve the creep performance and wear properties of PTFE by affecting its low and high temperature. In addition, glass-filled compounds perform exceptionally well in oxidizing environments.
Carbon fiber: Carbon fiber is essential for reducing creep, increasing hardness, and increasing flexibility and compression modulus. Polytetrafluoroethylene mixed with carbon fiber compounds has high thermal conductivity and a low thermal expansion coefficient. Carbon fiber is inert to strong alkalis and hydrofluoric acid (glass fiber can withstand both acids). These parts are ideal for manufacturing automotive parts such as shock absorbers.
Carbon: Carbon as an additive will help reduce creep, increase hardness, and improve the thermal conductivity of PTFE. The same results can be achieved by mixing PTFE and graphite and improving the wear resistance of carbon-filled compounds. These blends are ideal for non-lubricated applications, such as piston rings in compression cylinders.
Bronze-filled PTFE: This compound has excellent thermal and electrical conductivity, making it ideal for applications that are subject to extreme loads and temperatures.
Benefits of adding fillers –
Fillers/additives are essential to increase the porosity of PTFE compounds, which therefore affects electrical properties - it reduces dielectric strength while increasing dielectric constant and dissipation factor.
Fillers can significantly improve the performance of PTFE at high and low temperatures.
The change in chemical properties depends largely on the type of additive used, however. Generally speaking, it also leaves a positive result.
For PTFE product manufacturers and their material supply chain, the precise selection and ratio control of fillers and additives is the key path to upgrade from raw material suppliers to high-performance application solution providers.
Through scientifically compounded fillers and precise control of structural parameters, PTFE is no longer a single functional material, but a composite platform that can be customized and "reshaped". Future competition in the PTFE market will focus on the engineering implementation and rapid mass production capabilities of high-performance composite materials.
