What gaskets are most commonly used in acidic media these days? ? ?
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What gaskets are most commonly used in acidic media these days? ? ?
We work with phosphoric acid, and almost all the gaskets used are PTFE ones!
This also depends on the operating conditions, such as pressure and temperature. Pipelines in acidic environments are generally lined with rubber; EPDM is used for temperatures below 100 degrees, while PTFE is used at higher temperatures. However, PTFE has a high Shore hardness and low resilience. You can consult the recommended manufacturers listed in the appendix at the end of the gasket section of HG/T20592 for more information.
Check the temperature – PTFE becomes soft; when the temperature is high and the pressure is high, it ceases to function. It softens at 200 degrees. For high temperatures and pressures, use graphite wound gaskets with a layer of PTFE around them
What kind of acid? Inorganic or organic acid. Plastic pipes are also different from metal pipes, plus there’s the temperature issue mentioned above.
Specific operating conditions such as the operating temperature, operating pressure, the composition and type of acid, its concentration – all these factors vary. It’s important to consider whether it is a single acid or a mixed acid, whether it is an oxidizing acid or a non-oxidizing acid, whether it is an inorganic acid or an organic acid, and so on. Only by listing all such details can an appropriate choice be made.