PCTFE - Amorphous / Crystalline
PCTFE - Amorphous / Crystalline
(OP)
Is anyone aware of a test that can be performed to give a reliable indication as to whether the form of the material is in either the crystalline or amorphous state?
We use this material for seals in cryogenic applications and experienced a failure when using the crystalline form of the material as opposed to the amorphous (or 'more amorphous') grade.
Can anyone direct me to any useful information on this product - our suppliers have been as helpful as possible but, obviously, need to protect their proprietary processes.
We use this material for seals in cryogenic applications and experienced a failure when using the crystalline form of the material as opposed to the amorphous (or 'more amorphous') grade.
Can anyone direct me to any useful information on this product - our suppliers have been as helpful as possible but, obviously, need to protect their proprietary processes.





RE: PCTFE - Amorphous / Crystalline
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
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RE: PCTFE - Amorphous / Crystalline
In a gearbox that experienced stall at travel limits in the mechanism, we had trouble with crystalline Acetal gears, but the problem went away when we switched to Nylon 6.
RE: PCTFE - Amorphous / Crystalline
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: PCTFE - Amorphous / Crystalline
Even some polymer manufacturers do not have in house access to X-ray diffraction, however i agree it is the only "real method".
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: PCTFE - Amorphous / Crystalline
Thank you all for your comments - much appreciated.
RE: PCTFE - Amorphous / Crystalline