Flange gasket temperature resistant material comparison

The following is a comparison of the characteristics of different types of flange gasket temperature-resistant materials:

1. Rubber material
- Nitrile rubber (NBR): general temperature resistance, usually suitable for environments around 60°C, the maximum operating temperature is about 120°C, mainly used for mechanical equipment connections, its oil resistance is good, but the temperature range is relatively narrow.
- Fluororubber (FKM): has strong chemical corrosion resistance and excellent temperature resistance. It can work normally in the temperature range of -20°C to 200°C. Some specially formulated fluororubbers can withstand higher temperatures and are suitable for environments with acid and alkali resistance requirements and certain temperature fluctuations.
- Silicone rubber (Si): excellent high temperature resistance, suitable for high temperature pipeline connections, can maintain good elasticity and sealing performance at temperatures of -50°C to 250°C, and some special silicone rubbers can even withstand high temperatures of 300°C.

2. Plastic materials
- Polytetrafluoroethylene (PTFE): strong chemical inertness and good corrosion resistance. Ordinary PTFE gaskets can be used in the temperature range of -180℃ to 260℃, but it also has some disadvantages, such as non-reusability and high price. In addition, the temperature range of corrosion-resistant expanded PTFE gaskets varies depending on the flange form and sealing medium. For example, when the convex flange RF seals the liquid medium, the applicable temperature range is -100℃ to +170℃; under the full-plane flange FF working condition, the temperature range is -100℃ to +200℃.
- Nylon (NYLON): Strong toughness, suitable for low temperature environment, temperature resistance range is roughly -40℃ to 100℃, and its performance may be affected beyond this range.
- Polyester: Has good strength and heat resistance, generally can be used in a temperature environment of -60℃ to 150℃.

3. Metal materials
- Stainless steel: has good corrosion resistance and high temperature resistance. Ordinary stainless steel gaskets can withstand high temperatures of 400℃ to 600℃. Some special gaskets made of stainless steel alloy materials can withstand temperatures of up to 800℃ and above. They are often used in high temperature, high pressure and corrosion risk environments.
- Copper: has good electrical conductivity and thermal conductivity, good temperature resistance, and can generally be used in the range of -200℃ to 350℃, but its strength will decrease at high temperatures.
- Aluminum: light weight, good processing performance, but relatively weak temperature resistance, usually suitable for environments of -200℃ to 200℃, often used in places where weight is required and the temperature is not particularly high.

4. Other materials
- Oil-impregnated asbestos gasket: the material is easy to break, the middle layer is loose, and it can only be used for medium and low pressure pipelines. The temperature resistance is generally below 450℃, and asbestos is harmful to human health, so be careful when using it.
- German BOX high temperature sealant: As a special "gasket material", it has a strong advantage of temperature resistance, with a maximum temperature resistance of 900°C. It also has good pressure resistance and is suitable for working conditions with high requirements on temperature and pressure conditions of smooth and flat sealing surfaces (butt joints), such as steam turbines and gas turbines.