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As lawmakers around the world weigh bans of 'forever chemicals,” many manufacturers are pushing back, saying there often is no substitute.

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[-] alvvayson@lemmy.world 32 points 2 years ago

One of their uses is in firefighting chemical fires.

When an electric car is on fire, you need PFAS to stop the lithium fire. Water just can't stop it.

Of course, before batteries we used gasoline.

I imagine their might be more of these cases where modern technology relies on unsustainable practices.

[-] Vodik_VDK@lemmy.world 8 points 2 years ago

TheConversation.com

Another factor that makes lithium-ion battery fires challenging to handle is oxygen generation. When the metal oxides in a battery’s cathode, or positively charged electrode, are heated, they decompose and release oxygen gas. Fires need oxygen to burn, so a battery that can create oxygen can sustain a fire.

Because of the electrolyte’s nature, a 20% increase in a lithium-ion battery’s temperature causes some unwanted chemical reactions to occur much faster, which releases excessive heat. This excess heat increases the battery temperature, which in turn speeds up the reactions. The increased battery temperature increases the reaction rate, creating a process called thermal runaway. When this happens, the temperature in a battery can rise from 212 F (100 C) to 1,800 F (1000 C) in a second.

[-] dan1101@lemm.ee 7 points 2 years ago

Just because PFAS is one way doesn't mean there aren't other things that would work.

[-] alvvayson@lemmy.world 5 points 2 years ago

I really hope there are others. I haven't heard of alternatives yet.

[-] echo64@lemmy.world 3 points 2 years ago

Regulate it and the ev car manufacturers will spend the money to find one.

[-] dragonflyteaparty@lemmy.world 2 points 2 years ago

So for electrical fires, they use carbon dioxide to smother the fire and sodium bicarbonate to aid in putting it out, along with class c fire extinguishers. Class c are just carbon dioxide.

For chemical fires, carbon dioxide extinguishers are also used. They can use extinguishers with bromochlorodifluoromethane, aka Halon 1211, (which I guess could be a pfas chemical, but I don't find anything either way).

[-] Haywire@lemm.ee 3 points 2 years ago

Electrical fires don't generate their own oxygen.

[-] Kiwi@lemmy.fmhy.net 1 points 2 years ago

Well, normal electric fires don't but, as @Vodik_VDK@lemmy.world already quoted, lithium-ion battery fires do generate their own oxygen

[-] Haywire@lemm.ee 1 points 2 years ago

That was my point to. I guess I wasn't clear enough.

[-] SaltySalamander@kbin.social 1 points 2 years ago

Good thing a lithium fire isn't an electrical fire then, isn't it?

[-] Haywire@lemm.ee 1 points 2 years ago* (last edited 2 years ago)

I don't know that it is a good thing. It just means you can't use baking soda to out it out.

[-] Haywire@lemm.ee -2 points 2 years ago

Wouldn't it just be better to cure cancer? Why don't the scientists just do that?

[-] Emma_Gold_Man@lemmy.dbzer0.com 1 points 2 years ago

Sand. You use sand.

[-] Knightfox@lemmy.one 1 points 2 years ago

The big one is airplane fires, AFFF is the best foam for putting out a jet fuel fire.

this post was submitted on 21 Oct 2023
317 points (96.8% liked)

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