It didn’t even occur to me that ABS pipe is pretty much only used for drainage and vents. I think it’s still probably decent to have unrated pipe tear smoothly

It didn’t even occur to me that ABS pipe is pretty much only used for drainage and vents. I think it’s still probably decent to have unrated pipe tear smoothly rather than rated pipe—over pressured—shatter? I guess the pro move is to either (1) fully characterize the amount of pressure made from a random shot of hairspray, then choose a PVC pipe to accommodate, or (2) put a larger ABS sleeve over the inner PVC combustion chamber to contain the shrapnel.