The material used for sealing with pressure is required to have good heat resistance, corrosion resistance, pressure resistance, wear resistance, good sealing and other characteristics to ensure the sealing effect and long-term stability. Below we will conduct a detailed analysis from the type, characteristics, scope of application and advantages and disadvantages of the material.

First, metal materials

1. Stainless Steel

Because of its excellent corrosion resistance and high temperature resistance, stainless steel has become one of the selected materials with pressure sealing. Stainless steel materials are mainly 304, 316, 321 and other different grades, and different grades of stainless steel have different performance characteristics. Among them, 316 stainless steel can withstand corrosion and chloride ion erosion under high temperature and pressure, and is more suitable for pressure sealing than 304 stainless steel.

2. Alloy steel

Alloy steel material has high wear-resisting and heat-resisting properties, which is suitable for rewriting tape pressure sealing under high temperature and high pressure environment. Alloy steel materials include CrMo alloy steel, CrNiMo alloy steel, CrNiW alloy steel, etc., of which CrMo alloy steel is commonly used.

3. Titanium alloy

Titanium alloy has good corrosion resistance, but also has good high temperature resistance and wear resistance, so it is also one of the excellent materials with pressure sealing. Titanium alloy material is not easy to oxidize, non-magnetic, light weight, high strength and other characteristics, but the price is high.

Second, polymer materials

1. Polytetrafluoroethylene (PTFE)

Polytetrafluoroethylene is a polymer material with excellent temperature resistance and corrosion resistance, which is suitable for sealing with pressure. PTFE has high temperature resistance, can maintain good physical properties and chemical stability at high temperatures, and has good corrosion resistance, can withstand a variety of strong acids, strong bases, solvents and other corrosive media erosion.

2. Polyimide (PI)

Polyimide is a kind of heat and corrosion resistant polymer material with good mechanical properties and chemical stability, which is suitable for pressure sealing. Polyimide material has high temperature tolerance, can maintain good physical properties and chemical stability at high temperatures, but also has good corrosion resistance, can withstand a variety of strong acids, strong bases, solvents and other corrosive media erosion.

Third, composite materials

1. Thermoplastic composite materials

Thermoplastic composites are mainly composed of resins and additive materials, which have high strength and stiffness. The material has good heat resistance and corrosion resistance and is suitable for sealing with pressure.

2. Thermosetting composite materials

Thermosetting composites are mainly composed of resins and additive materials, which have high strength and stiffness. The material performs well at high temperatures and also has good corrosion resistance, making it suitable for use with pressure plugging.

In short, the selection of sealing materials with pressure should be considered according to the specific use environment, requirements and characteristics of the material, and materials with heat resistance, corrosion resistance, pressure resistance and good sealing characteristics should be selected for sealing, so as to achieve the maximum sealing effect.

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