Polyether ether ketone (PEEK) is a polymer composed of one ketone bond and two ether bond repeating units in the main chain structure, belonging to special polymer materials. With high temperature resistance, chemical corrosion resistance and other physical and chemical properties, is a kind of semi-crystalline polymer material, can be used as high temperature resistant structural materials and electrical insulation materials, can be prepared with glass fiber or carbon fiber composite reinforcement material. A type of polyaryl ether polymer generally obtained by condensation with aromatic diphenol. This material has numerous applications in aerospace, medical devices (as artificial bone to repair bone defects) and industrial fields.

1) The injection molding shrinkage rate of PEEK plastic raw materials is small, which is very good for controlling the dimensional tolerance range of PEEK injection parts, so that the dimensional accuracy of PEEK parts is much higher than that of general plastics;

2) The thermal expansion coefficient is small, and the size of PEEK parts changes little with the change of temperature (which can be caused by the change of ambient temperature or friction heat generation during operation);

3) Good dimensional stability. The dimensional stability of plastics refers to the dimensional stability of engineering plastic products in the process of use or storage. This size change is mainly caused by the improvement of the activation energy of polymer molecules, which leads to a certain degree of crimp in the chain segment;

4) PEEK has outstanding heat-resistant hydrolysis characteristics, and its water absorption is very low in high temperature and humidity environment, so there will not be obvious changes in the size of general plastics like nylon due to water absorption.