I'll be honest, this is the first I have heard of freezing the entire container, so I couldn't say if it would work, but it sounds like it would.....if it does I have to say that it is a pretty efficient way to get every last drop. ALthough some goodies could remain frozen in your material/base layer. I am not too familiar with a/b extractions, only stb...in stb lye is used, and I have heard it acts as an antifreeze and is not as easy to freeze, so I don't believe it would work for an stb tek. But for an a/b extraction I could not say?...no matter what you should gather as much out of your jar before attempting the freeze...no sense in wasting. Recycle your naptha (warmed if possible) back into the container until your pulls produce nothing, generally you can feel comfortable the material is spent at that point.