Operating temperature of PTFE flange gaskets
Thread Content
According to HG/T 20606-2009, the minimum operating temperature for polytetrafluoroethylene flange gaskets is -50°C, while polytetrafluoroethylene retains its toughness at -196°C. Can PTFE gaskets be used at temperatures below -50°C?
Polytetrafluoroethylene sheet, code: PTFE. Operating temperature: -50°C to +100°C. Expanded polytetrafluoroethylene sheet or strip, code: ePTFE. Operating temperature: -200°C to +200°C. Filled and modified polytetrafluoroethylene sheet, code: RPTFE. Operating temperature: -200°C to +200°C℃
The answer above is correct, but in practice, we use it in this way as well
It’s possible in theory, and it’s also possible in practice. However, leaks occurred in the low-temperature liquid storage tanks of our overseas projects due to the use of polytetrafluoroethylene, and later graphite was used as a replacement for it in all such tanks