S pecial Polyimide Powder for Reinforc ing PTFE As we all know that for Polytetrafluoroethylene (PTFE) , because of its excellent self-lubricating, corrosion resistance and high temperature performance in the field of friction and wear materials occupy a very important position. But its low...
As we all know that for Polytetrafluoroethylene (PTFE), because of its excellent self-lubricating, corrosion resistance and high temperature performance in the field of friction and wear materials occupy a very important position. But its low hardness, easy creep, poor resistance to friction, the need to add filler to improve these shortcomings to meet the mechanical seal, friction in the field of application requirements.
Commonly used fillers are glass fiber, carbon fiber, graphite, molybdenum disulfide, bronze powder and high temperature resistant organic polymer materials. However, inorganic filler and PTFE combined with poor friction and wear easily fall off, resulting in poor wear resistance, and easy to damage dual, poor machinability, limiting the application of its extremely harsh conditions. The PTFE-filled polymer needs to be stable during sintering (380°C). Therefore, only a few polymers such as polyether ether ketone (PEEK), polyphenylene sulfide (PPS), aramid (AF), polyphenylene oxide (POB) and polyimide (PI) can be "competent".
SOLVER POLYIMIDE developed special grade polyimide for enhancing polytetrafluoroethylene (PTFE) (SolverPI-Powder 1800 and SolverPI-Powder 1822). The only difference between SolverPI-Powder 1800 and SolverPI-Powder 1822 is the color appearance. Other performance is same.
Glass transition temperature
Thermal expansion coefficient
Permissions on the oxygen index
The compression strength
The bending strength
The impact strength
SolverPI-Powder 1800 Filled PTFE Appearance:
SolverPI-Powder 1822 Filled PTFE Appearance is more like filled by P84:
The average particle size of SolverPI-Powder 1800 and SolverPI-Powder 1822 is 1000 mesh (13μm). It is a thermosetting polyimide, will not melt. The glass transition temperature can be 385℃. No physical and chemical changes but with creep resistance and high hardness when sintering in the temperature 360-380℃, so it’s very suitable for enhancing PTFE products. Due to the special chemical structure and micro-aggregation of the polyimide (PI), in the process of friction and wear, especially dry friction, can effectively increase the PTFE transfer film and dual bonding strength, and PI hard particles evenly dispersed in the PTFE matrix, play a supporting role in the load, thereby greatly improving the mechanical strength of the material, friction properties, creep resistance and Vicat softening temperature.
Our researches show that the addition of 15% of our polyimide can improve the wear resistance of PTFE 400 times, compared with other polymers (PEEK, PPS, AF, POB), the best enhancement effect is the best "partner" for PTFE. For example, with the addition of 15% content, add this product to enhance the PTFE composite material than the addition of polyphenylene (POB) wear resistance 7 times higher than the limit PV value higher than 2 times. Therefore, the product has been widely used in compressor seals, cups, bushings, rails, flexible rails, rapier wear-resistant layer and other PTFE composite materials.
Performance of SolverPI-Powder 1800 Filled PTFE
PI fill rate (%)
Tensile Strength (MPa):
Shore hardness (shore D):
Vicat softening temperature (℃):
Coefficient of friction