this post was submitted on 16 Jul 2025
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[–] Thorry84@feddit.nl 27 points 2 days ago* (last edited 2 days ago) (3 children)

One common misconception I've seen is people suddenly being afraid of their PTFE items they use at home. For example coated pans or PTFE cutting boards. They throw them out, because they think these will hurt them.

However this is not true. The long chain molecules used in the final product are perfectly safe. They get all their useful features from being big molecules and being very inert. That's why they are used in the first place. As such these molecules can't interact with biologics at all. You can safely eat them, they will just pass through your body. They don't interact with anything and are too big to get incorporated into anything.

The issue with stuff like PTFE is the production. That's where a lot of small PFAS molecules get used and after they've been used they can't easily be used again. So it's discarded as waste. But it turns out these smaller molecules can interact with biologics and not in a good way. And as they are still pretty inert, they don't break down at all. Hence the term forever chemicals.

Back in the day Dupont studied if those smaller PFAS molecules they were discarding into the world's water by the boatload could do any harm. They quickly found out yes, it can do a lot of harm. But to not hurt the bottom line (number must go up), they kept it a secret. This has damaged the environment in a very significant way.

When this came to light, they set out to design a new small molecule to use in the production. One that would be safe. So they did and used that, which satisfied the public for a time. However later it was proven this is a fantasy. The new molecule is just as bad as the previous one. And it turns out any variant of these kinds of molecules are just as harmful. That's why we now collectively call this class of molecule PFAS. Dupont probably knew about this, as the properties that made them useful in the production are the same properties that make it so dangerous to biologics. However since stuff like PTFE is too important in our modern world, we kept making the stuff. Only recently have we found out how big of a problem we are creating with that.

So when you have PTFE or similar items, please keep using them. The damage for these items is already done and the end product is safe. It would be a waste to have done the damage and then not even use the end product. But when buying new stuff, be on alert. Try to find out if PFAS was used in the production of the item and try to avoid where possible. There has been talk of laws in the EU which would require the label on a product to show if PFAS was used, so people can avoid it. But we aren't there yet.

If we were smart, we would ban it altogether. But like I said, too much of the modern world depends on these kinds of materials. So that's probably not going to happen.

[–] Kyle@lemmy.ca 4 points 1 day ago

I love it when people can reason like this. Thanks for the constructive post.

[–] obsoleteacct@lemmy.zip 5 points 1 day ago

The problem with banning it all together is that there are hundreds of critical applications for which they're really is no alternative for PTFE, PCTFE and various derivative products.

Could we get by without Teflon pans, stain resistant fabric sprays, and consumer spray on dry lubricant... Sure. I'd really like them to take it out of food packaging. That would be nice.

But the world needs to interact with incredibly strong acids, and cryogenic temperatures and all sorts of other things for which human lives depend on having an absurdly inert material.

[–] mrductape@eviltoast.org 5 points 1 day ago

This was actually a very interesting and informative read, thank you. I learned some things.

[–] Weslee@lemmy.world 2 points 1 day ago

https://youtu.be/SC2eSujzrUY

This video on the topic was pretty good for a starting point on learning about it

Unless it's all wrong, hopefully someone lets me know

[–] Reverendender@sh.itjust.works 8 points 2 days ago

Welp, we’re all doubly fucked.

[–] agavaa@lemmy.world 4 points 2 days ago

Faced with such terrible truth many people will conclude that we're fucked anyway, so they might as well ignore it and go on as if nothing happened. Which makes me even sadder.