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Author Topic: PTFE vs FEP: Chemical resistance  (Read 2685 times)

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curiouscat

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PTFE vs FEP: Chemical resistance
« on: June 11, 2014, 12:08:30 AM »

How similar is the Chemical Resistance of Teflon (PTFE) versus FEP? I have an application involving Styrene for which PTFE is rated as a suitable MOC but I cannot find similar tables for tests with FEP.

Unfortunately FEP seems more common as a lining material for pumps etc. than PTFE & hence I'd love to know.
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kriggy

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Re: PTFE vs FEP: Chemical resistance
« Reply #1 on: June 11, 2014, 12:48:44 AM »

As far as I remember then FEP should be more resistant than teflon but its just random thought I remember from lectures.
This helps?
http://www2.dupont.com/Teflon_Industrial/en_US/tech_info/techinfo_compare.html

curiouscat

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Re: PTFE vs FEP: Chemical resistance
« Reply #2 on: June 11, 2014, 12:51:10 AM »

As far as I remember then FEP should be more resistant than teflon but its just random thought I remember from lectures.
This helps?
http://www2.dupont.com/Teflon_Industrial/en_US/tech_info/techinfo_compare.html

Well thanks for that link. I had found that one before (and similar ones) but it's not very helpful since it says generically "Excellent Chem. Resistance" for both.
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sm1dger

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Re: PTFE vs FEP: Chemical resistance
« Reply #3 on: June 16, 2014, 01:21:20 AM »

In my experience they are both pretty damn stable and its just a case of FEP being used where a bit of rigidity is needed. Apart from that the only difference is price and reactivity with sodium naphthalide (where PTFE is a bit more reactive). You should be fine with FEP
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curiouscat

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Re: PTFE vs FEP: Chemical resistance
« Reply #4 on: June 17, 2014, 01:35:45 AM »

In my experience they are both pretty damn stable and its just a case of FEP being used where a bit of rigidity is needed. Apart from that the only difference is price and reactivity with sodium naphthalide (where PTFE is a bit more reactive). You should be fine with FEP

Thanks!
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zsinger

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Re: PTFE vs FEP: Chemical resistance
« Reply #5 on: June 17, 2014, 07:50:01 AM »

FEP resists ALL!!!!! Not cheap, but stores liquid bromine like a charm (maybe superacids would be the only MORE corrosive thing)!  Also can be refrigerated and heated in boiling nitric acid!
          -Zack
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tefcapind

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Re: PTFE vs FEP: Chemical resistance
« Reply #6 on: March 10, 2015, 04:43:21 AM »

You will be fine with either one. The BIGGEST difference between the two boils down to Temperature and Flexibility. PTFE has a higher Temp rating and a Longer Flex Life.

http://www.tefcap.com/summary-of-properties/
http://www.tefcap.com/wp-content/uploads/2013/12/Chemical-Resistance-A-Z.pdf

Pricing they are pretty much each the same price but if you need longer lengths than you would need to go with FEP.

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curiouscat

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Re: PTFE vs FEP: Chemical resistance
« Reply #7 on: March 10, 2015, 04:57:56 AM »

You will be fine with either one. The BIGGEST difference between the two boils down to Temperature and Flexibility. PTFE has a higher Temp rating and a Longer Flex Life.

http://www.tefcap.com/summary-of-properties/
http://www.tefcap.com/wp-content/uploads/2013/12/Chemical-Resistance-A-Z.pdf

Pricing they are pretty much each the same price but if you need longer lengths than you would need to go with FEP.

Thanks!
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tefcapind

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Re: PTFE vs FEP: Chemical resistance
« Reply #8 on: January 10, 2019, 12:11:48 PM »

Teflon PTFE FEP PFA Chemical Resistance Charts have been moved to a new page.
https://tefcap.com/literature/
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