Plastic bearing seats are lightweight, easy to install, maintenance free, and have shock absorption and impact resistance properties that are not commonly found in cast iron or stamped bearing seats. With the continuous development of new materials for bearing seats, they are increasingly being widely used in engineering. For different situations, plastic outer spherical bearings can be made of different materials such as POM, HDPE, PP, UPE, PTFE, etc. Compared to plastic outer spherical bearings, PBT material is generally used. The most typical varieties of fluoroplastics, PTFE and PVDF, have the best corrosion resistance, among which PTFE has the best corrosion resistance among all known engineering plastics. It can be used in all concentrated acid and alkali applications, including HF and fuming sulfuric acid nitric acid (over 98%), and has good high-temperature performance. PTFE has been proven to be suitable for high temperatures up to 180 ℃, and PVDF can also be used up to 150 ℃. However, PTEF materials have extremely low mechanical strength, poor dimensional stability, and large temperature deformation. Compared with PVDF, PVDF has better comprehensive performance. Generally, PTFE or PVDF is selected as the inner and outer ring materials, PTFE or PVDF as the retaining frame material, and glass or ceramic balls are used as the ball bearings.

characteristic:

1. Excellent chemical corrosion resistance, able to withstand all strong acids (including aqua regia) except for molten alkali metals, fluorinated media, and sodium hydroxide above 300 ℃, as well as strong oxidants, reducing agents, and various organic solvents

2. It has excellent heat resistance, with a melting temperature of 324 ℃, a decomposition temperature of 415 ℃, a maximum operating temperature of 250 ℃, a brittleness temperature of -190 ℃, and a hot deformation temperature (under 0.46MPa conditions) of 120 ℃.
3. It has the smallest surface tension among solid materials and does not adhere to any substance

4. Low friction performance, with the lowest friction coefficient among known solid materials

5. Aging resistance

6. Good elasticity