Chemical Forums

Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: curiouscat on June 11, 2014, 06:08:30 AM

Title: PTFE vs FEP: Chemical resistance
Post by: curiouscat on June 11, 2014, 06:08:30 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.

Title: Re: PTFE vs FEP: Chemical resistance
Post by: kriggy on June 11, 2014, 06:48:44 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

Title: Re: PTFE vs FEP: Chemical resistance
Post by: curiouscat on June 11, 2014, 06:51:10 AM

Quote from: kriggy on June 11, 2014, 06:48:44 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

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.

Title: Re: PTFE vs FEP: Chemical resistance
Post by: sm1dger on June 16, 2014, 07:21:20 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

Title: Re: PTFE vs FEP: Chemical resistance
Post by: curiouscat on June 17, 2014, 07:35:45 AM

Quote from: sm1dger on June 16, 2014, 07:21:20 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

Thanks!

Title: Re: PTFE vs FEP: Chemical resistance
Post by: zsinger on June 17, 2014, 01:50:01 PM

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

Title: Re: PTFE vs FEP: Chemical resistance
Post by: tefcapind on March 10, 2015, 10:43:21 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.

Title: Re: PTFE vs FEP: Chemical resistance
Post by: curiouscat on March 10, 2015, 10:57:56 AM

Quote from: tefcapind on March 10, 2015, 10:43:21 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.

Thanks!

Title: Re: PTFE vs FEP: Chemical resistance
Post by: tefcapind on January 10, 2019, 06:11:48 PM

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