Two, if you do not want to keep spilling out during mixing.
Same as typical big trash cans.
Yes I think so, just clean it after use.
It is a soft plastic not to break, but hard enough to withstand the pressure of mixing. It seems like recycled plastic.
yes but i wouldn't use more than enough to cover the bottom an inch or so.
its a little on the large size,but sure.
I would guess that it would hold boiling water.