(12-10-2014, 12:57 PM)PaytonA Wrote: I believe that most of the tanks being discussed in this thread, that have "burn" marks are the original aluminum tanks.
Per ResMed, All A10 tanks are "stainless," both cleanable and standard. They could be different types of stainless, different thicknesses, manufacturing processes, etc.
Note they don't say what kind of plastic the A10 tanks are made from. I guess they don't want people to think they have BPA in them. I wonder if they're made from something other than polycarbonate.
Apparently, S9 standard tanks have aluminum bottoms, but that might be the old tanks. They changed the standard tanks at some time after this document, and I'm pretty sure the newer s9 standard tanks are not polycarbonate.