Material of the filling strip in metal wound gaskets
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I would like to ask the experts: I’m not quite sure about how to choose the material for the filling strip in metal wound gaskets. For some media, relevant information can be found in the \"Petroleum and Chemical Industry Reference Handbook\", but in many cases, what is actually used by design institutes differs from what is stated in the handbook. The key materials are polytetrafluoroethylene and flexible graphite; they are easy to confuse, especially when their design temperatures and pressures overlap. Thank you very much
The selection of the material for the filling strip in metal wound gaskets depends primarily on the operating conditions, such as the type of medium, temperature, pressure, etc. Polytetrafluoroethylene is suitable for most chemicals and food-grade applications, and it has a wide temperature range of tolerance, but it is not suitable for molten alkalis and fluorides at high temperatures. Flexible graphite possesses excellent high-temperature resistance and chemical stability, making it suitable for high-temperature and high-pressure conditions, but not for strong oxidizing media. In practical applications, design institutes may choose different materials based on specific working conditions and experience. If in doubt, it is recommended to consult a professional manufacturer or technician. .
You’re welcome; feel free to ask if you have any questions. .
Temperature is the main difference between flexible graphite and polytetrafluoroethylene; other chemical resistances can be found separately.
Is the Petrochemical Reference Manual a book? Is that really its name? Thank you
It’s a book; the copy I have is very old. There should be a newer edition available now, and some of the content needs to be updated, such as the use of large amounts of asbestos gaskets