“…… due to its singular chemical profile, phosgene exposure remained a silent killer when dealing with such 20th-century refrigerants as R-11, R-12, R-113, and R-114. Containing two chlorine atoms and one oxygen atom, phosgene forms when chlorinated hydrocarbon compounds are exposed to high temperatures. These compounds contain chlorine, hydrogen, and carbon, and they become toxic when exposed to high temperatures, such as when checking for leaks.”
Non sequitur. You made the claim in post #81 that R-12, when exposed to a flame, results in mustard gas. Prove it or leave me be.