Interesting. Did a little more digging and it looks like both are used for air dusters, with 134a being marketed for "energized circuits" because it's non-flamm

Interesting. Did a little more digging and it looks like both are used for air dusters, with 134a being marketed for "energized circuits" because it's non-flammable (e.g. https://www.amazon.com/dp/B005DNR066 https://www.amazon.com/dp/B005DNR066). 152a has ~1/10 of the GWP as 134a. In any case, it's still amazing to me how restricted these are when used as a refrigerant, but then they're sold to consumers to spray on whatever they want. It really undercuts the environmental impact of these chemicals.