Teflon Packing Limit
Teflon Packing Limit
(OP)
Hi All ,
What is the Temperature and Pressure limit for Teflon Packing ? ...
Thanks In Advance
Shameer
What is the Temperature and Pressure limit for Teflon Packing ? ...
Thanks In Advance
Shameer





RE: Teflon Packing Limit
Non-reinforced PTFE is usually limited to 232 C (450 F). In a bad joint design it can creep away and leak at temperatures far lower. Reinforced varieties and sometimes PFA can be extended to 260 C (500 F) with good joint design. I've seen PTFE used successfully in a totally entrapped gasket application to 315 C (600 F) where the material should be reverting to its monomer.
RE: Teflon Packing Limit
What limits? Up or down? Usually limits are discussed as the high-end limits, as above.
If the limits also should be read as lower-end limits, the discussion would be even more specialized, and compabillity with sub-zero fluids (also below minus 10 deg centigrade if applicable) and allowed leakage-rates have to be taken into consideration in addition to all factors mentioned in Moltenmetals good answer.
RE: Teflon Packing Limit
you will probably find the answer to your question (or at least part of it) in thread408-163021: PTFE for high performance butterfly valve within this Forum.
Other information about related issues in thread408-204558: PTFE Packing for Fugitive Emission control and thread408-228250: ASTM material spec for PTFE v-ring packing...
Hope this helps, 'NGL
RE: Teflon Packing Limit
I meant is Teflon V-Type design which normally used in globe valve packing..Whether any pressure limit to teflon since it also subject to pressure in the gallery when we use balanced trim.? , ..
Awaiting for your reply
Best Regards
Shameer
RE: Teflon Packing Limit
Personally I would not use teflon chevron packings beyond 450 F (232 C). Individual valve manufacturers will advise you of their own limits for each design of packing.