In recent years, PTFE gaskets have been widely used as sealing and filling materials. It is also named Teflon gasket in foreign countries, it is a flat gasket made of polytetrafluoroethylene pipes and plates by mechanical turning or cutting,V-shaped gaskets, piston rings, ball valve gaskets, etc. In fluid machinery (such as pumps, compressors, mixing kettles, centrifuges, etc.), components with strict operating conditions should be considered as PTFE gaskets.

Manufacturers of PTFE products use PTFE gaskets as engineering plastics, which can be made into PTFE pipes, rods, belts, plates, films, etc. It is usually used in fields such as pipelines, ships, radar, and high-frequency communication equipment, with high performance requirements. The usage conditions for PTFE gaskets are in the chemical industry, petrochemical industry, oil refining, natural gas, organic synthesis, non-ferrous smelting, steel and high-purity product production. Generally speaking, the specification of PTFE gaskets is the inner diameter+Outer diameter+thickness, with the following processing methods:

1. By producing polytetrafluoroethylene pipes and turning them into gaskets with a certain thickness, they are suitable for small sizes and batches.

2. Made by cutting a certain thickness of polytetrafluoroethylene sheet, suitable for large, medium, small sizes and small batches.

3. Adopting mold forming, suitable for large, medium, small sizes, and large batches.

However, production can be carried out after determining the inner, outer diameter, and thickness of the PTFE gasket. However, in some cases, it is necessary to know more detailed information about the PTFE gasket, such as the material of the PTFE gasket. The materials of PTFE gaskets can be divided into pure PTFE gaskets, reinforced PTFE gaskets, and modified PTFE gaskets. There is also an understanding of the flange form. For PTFE gaskets that require drilling, information such as the drilling position and hole diameter needs to be provided. For more usage details, it is necessary to communicate and exchange with the manufacturer.

The surface of the PTFE gasket is in a three-dimensional compressive stress state, and the material has a high resistance to deformation. The middle part of the PTFE gasket is less affected by the end and has less deformation resistance. Under the same preload, the middle part of the PTFE gasket is more prone to plastic deformation than the surface. At this point, establishing the initial seal becomes more difficult. Therefore, when the thickness of the PTFE gasket reaches a certain value, the sealing performance will not change or even deteriorate. In addition, the thicker the PTFE gasket, the larger the leakage area and the greater the leakage rate.

By increasing the flow resistance of the fluid, the gasket is deformed. The compression of the gasket is particularly reflected on the gasket surface and flange surface, which can form the initial sealing ability. It reflects the variation pattern of gasket material under a certain temperature and load, with its deformation increasing over time and stress decreasing over time. Under high temperature conditions, leakage may significantly increase, the effect of thickness on leakage: Under the same compression load and medium pressure, the leakage rate decreases with the increase of gasket thickness. This is because under the same axial load, thicker gaskets have greater compression rebound.