Quote Originally Posted by hemmjo View Post
You are correct that FOOD GRADE, Propylene Glycol is not toxic. It is actually used as a bowel cleaner in preparation for a colonoscopy. However, while Ethylene is a naturally occurring compound, Ethelyne Glycol is very toxic.
But there's no ethylene glycol in the AFFF.

Quote Originally Posted by hemmjo View Post
The BAD stuff in the AFFF are the PFAS.

From the article..."PFAS, or per- and polyfluoroalkyl substances, are a group of widely-used, man-made chemicals that are likely all around you. They are sometimes called “forever chemicals” because they don’t break down, and they can accumulate in both the environment and the human body. Studies have found that PFAS may cause serious health problems, including cancer."

There is a reason that so many young people are getting cancer and other diseases so young. I personally believe things like this are part of the reason. We are poisoning our home planet.
Okay lets slow down here. PFAS are inert, and that's why they don't break down. They don't chemically react with anything. So it's bad that they're polluting everything, but if they don't react then you need to look at another mechanism to cause cancer. They literally don't react and that's what makes them last forever. Like asbestos; it's inert and doesn't react, so how does it cause cancer? The particles are very sharp and cause tissue damage over and over for a long period of time, which can eventually develop into cancer. But PFAS are not sharp, so what mechanism causes cancer? Well PFAS are classified a "2B carcinogen" which is defined as "Limited or no evidence in humans. Limited or insufficient evidence in animals." Basically someone has a hypothesis but there's no evidence and/or it hasn't been tested. I would strongly suspect that PFAS have negative health effects but end up not being carcinogenic, mainly due to their unreactivity. To put this into perspective, red meat is a 2A carcinogen, and a 2A classification is a lot worse than 2B.