Makers beware!
Much like with common household chemicals used for cleaning, such as bleach and ammonia, improper use of these can produce e.g. chlorine gas, which while harmful is generally not lethal. Things get much more serious with brake cleaner, containing tetrachloroethylene. As explained in the video, getting brake cleaner on a rusty part to clean it and then exposing it to the intensive energies of the welding process suffices to create phosgene.
I was taught that if you’re in facility that uses phosgene as raw material and smell freshly cut grass, you have a day or two to say your goodbyes.
Normally phosgene isn’t quite that deadly. If you catch it full concentration then you’re in for a bad time as your lungs start blistering but that definitely isn’t something that happens from a small leak unless its also in a confined space. I’ve gotten a face full of phosgene a few times on the job and you definitely notice it. Idk what it smells like because to me it just smells like pain. It feels like you just took a huff off a bottle of drain cleaner. If you get hit with enough of it, it’ll leave you short of breath and your chest burning but the only time I ever got hit with that much was the time I took a plasma cutter to an old refrigerant can I had forgotten to purge with nitrogen first while working in a closed garrage.
Suffice it to say, you would definitely know it if you got exposed to any significant amount of phosgene.
Unless there’s a massive leak it will oftentimes work out fine, IF the medical services are on top of it early. Everyone entering a facility which uses or contains phosgene will have to wear an indicator strip which tells you the exposure level and will be used as a treatment decision help.
Thanks, that’s good to know. Still not setting foot on one. Would rather work with nuclear.