It depends on the foam. I bag XPS foam wings at 25" Hg
Yep, if the foam density is high enough. For <1# foam, where I play most of the time, 5-6" Hg as Bob noted is what I get away with. Maybe as much as 7-8" Hg, depending on foam firmness.I've crushed foam before when my bleeder valve sucked up a baggie and closed off. Really pissedme off.....