3 ms·

No, they aren't. PFAS (and specifically PFOA) has a carboxyl group, making it much more polar than PTFE (it is an acid). PFOA is soluble in water. PFTE is not.

by timr 3y ago

No, they aren't. PFAS (and specifically PFOA) has a carboxyl group, making it much more polar than PTFE (it is an acid). PFOA is soluble in water. PFTE is not. Even if there were lingering PFOA in Teflon, it would be quickly washed away. Some people try to confuse the issue by grouping together anything with a poly-CF2 chain as "PFAS", but this is wrong.

1over137 3y ago
>…would be quickly washed away There is no “away”. “away” is our waterways and soil.
- paulmd 3y ago
  It’s been washed outside the environment
  - TylerE 3y ago
    Please let me know where your sink that drains directly into the sun is. It would prove rather handy for the large quantity of nuclear waste I need to dispose of.
    - paulmd 3y ago
      (apologies but it's a goodie) https://www.youtube.com/watch?v=3m5qxZm_JqM https://www.youtube.com/watch?v=3m5qxZm_JqM
  - BoiledCabbage 3y ago
    Can we please keep the reddit comments on reddit? There is an entire site of simple jokes and small puns - please post them there instead. Yes I know it was just a joke. I do have a sense of humor. Yes I know downvote buttons exist. Those are the sugar additive of online comments. In blind taste tests people will often vote the sugary comment is prefered - and this is repeated until it's filled with sugary comments. HN is one of the few places to have avoided this fate - I'd love to keep it this way.
coldbrewed 3y ago
Firefighter turnouts both have PFAS right after manufacture, and continue to emit PFAS though wear and tear. Source: https://www.nist.gov/news-events/news/2024/01/wear-and-tear-may-cause-firefighter-gear-release-more-forever-chemicals https://www.nist.gov/news-events/news/2024/01/wear-and-tear-...
themerone 3y ago
PFAS are in the DWR coating on the outside of Gore-Tex fabric. The PTFE membrane is on the inside. The DWR finish definitely ends up going down the drain or wears off in use. There are new PFAS free DWR finishes, but don't know if Gore-Tex is using them yet. Gore does not consider PTFE to be environmentally friendly and is working on flourocarbon free fabrics.
- timr 3y ago
  No, they aren't. PFAS are/were used [1] in the creation of Teflon, which is what defines GoreTex. You're being confused by people who try to argue that Teflon is as PFAS. [1] there are other ways of making Teflon, and the industry has been phasing out PFOA for a long time.
  - themerone 3y ago
    No, you don't understand how Gore-Tex is made. Gore-Tex is a PTFE membrane laminated one side of a fabric. The other side of the fabric is coated with a DWR (durable water repellent) coating. The DWR finish prevents the outer fabric from being saturated with water. The DWR is not made from PTFE and historical has contained PFAS compounds. It is not a permanent finish, so it definitely ends up in the environment.

by timr 3y ago

1over137 3y ago

>…would be quickly washed away There is no “away”. “away” is our waterways and soil.

paulmd 3y ago
It’s been washed outside the environment
- TylerE 3y ago
  Please let me know where your sink that drains directly into the sun is. It would prove rather handy for the large quantity of nuclear waste I need to dispose of.
  - paulmd 3y ago
    (apologies but it's a goodie) https://www.youtube.com/watch?v=3m5qxZm_JqM https://www.youtube.com/watch?v=3m5qxZm_JqM
- BoiledCabbage 3y ago
  Can we please keep the reddit comments on reddit? There is an entire site of simple jokes and small puns - please post them there instead. Yes I know it was just a joke. I do have a sense of humor. Yes I know downvote buttons exist. Those are the sugar additive of online comments. In blind taste tests people will often vote the sugary comment is prefered - and this is repeated until it's filled with sugary comments. HN is one of the few places to have avoided this fate - I'd love to keep it this way.

coldbrewed 3y ago

Firefighter turnouts both have PFAS right after manufacture, and continue to emit PFAS though wear and tear. Source: https://www.nist.gov/news-events/news/2024/01/wear-and-tear-may-cause-firefighter-gear-release-more-forever-chemicals https://www.nist.gov/news-events/news/2024/01/wear-and-tear-...

themerone 3y ago

PFAS are in the DWR coating on the outside of Gore-Tex fabric. The PTFE membrane is on the inside. The DWR finish definitely ends up going down the drain or wears off in use. There are new PFAS free DWR finishes, but don't know if Gore-Tex is using them yet. Gore does not consider PTFE to be environmentally friendly and is working on flourocarbon free fabrics.

timr 3y ago
No, they aren't. PFAS are/were used [1] in the creation of Teflon, which is what defines GoreTex. You're being confused by people who try to argue that Teflon is as PFAS. [1] there are other ways of making Teflon, and the industry has been phasing out PFOA for a long time.
- themerone 3y ago
  No, you don't understand how Gore-Tex is made. Gore-Tex is a PTFE membrane laminated one side of a fabric. The other side of the fabric is coated with a DWR (durable water repellent) coating. The DWR finish prevents the outer fabric from being saturated with water. The DWR is not made from PTFE and historical has contained PFAS compounds. It is not a permanent finish, so it definitely ends up in the environment.