PEEK vs PTFE
PEEK vs PTFE
(OP)
Can we replace PTFE with PEEK everywhere? Is there any restriction to use of PEEK for PTFE ?
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RE: PEEK vs PTFE
RE: PEEK vs PTFE
I am mainly talking about valves here. I want to know the situations where PTFE can not be replaced by PEEK.
It may be any environment assuming PTFE can be used for that context.
RE: PEEK vs PTFE
When used as a seal material in valves there is a big difference in mechanical properties between PTFE and PEEK. Unfilled PTFE has virtually no mechanical strength and readily cold flows when subjected to any sustained pressure, while unfilled PEEK has fairly good mechanical strength. On the other hand, a PTFE valve seal would produce less friction, less wear, and have better conformability with the mating part than a PEEK seal would.
RE: PEEK vs PTFE
RE: PEEK vs PTFE
Still insufficient information. What part(s) of a valve?
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RE: PEEK vs PTFE
With PEEK you may be able to use unfilled, or PTFE filled versions even if you were using a filled PTFE, because it is so much stronger.
There are also many other related polyketone resins, PEK, PAEK, PEKK
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Plymouth Tube
RE: PEEK vs PTFE
PEEK as I know has higher wear resistance while PTFE is soft. Are there any fluid stream in Oil and Gas Production where PTFE is more suitable. Also I read in a forum that PEEK is more suitable in Upstream industries.
RE: PEEK vs PTFE
In liquid service you need to look at each chemical.
There is almost nothing that will attack PTFE, but for some high pressure services it isn't strong enough.
There are a number of environments that PEEK does not do well in.
Check the chemical comparability charts from the resin producers such as Greene Tweed, Solvay, or Victrex.
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Plymouth Tube
RE: PEEK vs PTFE