Low-temperature gasket
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Containers cooled by liquid nitrogen need to switch between low temperatures of -195 degrees and normal room temperatures. Which is more suitable for gaskets: polytetrafluoroethylene or metal-wound graphite gaskets? We’ve both tried it, and in both cases it was unreliable; I’m not sure which one to use
First, it is necessary to know the level of pressure, as well as whether the sealing type is static or dynamic sealing
Use a pressure of -0.1 to 2 Mpa. Static seal. No rotating structure
For low pressure, PTFE can be used; for high pressure, metal-wound type is used. There are also rubber-asbestos gasket wax coatings, metal-clad gaskets, etc. For reference.
At cryogenic temperatures using liquid nitrogen, polytrifluorochloroethylene (imported) or polyimide can meet general application requirements, and static seals do not have strict demands regarding the calculation of material shrinkage or installation requirements. Polytetrafluoroethylene is generally used at around minus 70 degrees Celsius, and it cannot be used stably for long periods at the low temperatures of liquid nitrogen.
Do you sell this? I don’t know where I can find gaskets made of these two materials
Or send over your usage structure diagram, and we can provide suggestions or products that meet your requirements.
15202474917 Mr. Li, please add me for a private message :)