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Well, the walls seem in every way to be a single layer. And when I put hot water into it, the outside immediately got hot. In other words, more like a beer can than a coffee thermos.

Thanks Dan. At this point I'm strongly considering getting rid of the dewar. I'm afraid that being uninsulated, it's not going to be useful (and may eveen be dangerous, as ianuts suggests). I need something that wouldn't lose more than 25% over the course of several days. It also seems to me...

I'm wondering if the thing is mislabeled, and isn't supposed to be an LN2 dewar. I've seen used ones in a few places online, and they're all called LN2 dewars. Maybe it's for very short term storage? I'd still think handling it would be an issue. It's supposed to pressurize to 140 psi (close to...

I guess I wasn't clear ... it's just like the one I have and it's not insulated. Just a single wall of stainless steel. It surprised me when it showed up ... I was expecting it to be insulated.

Thanks iainuts. If it's helpful, here's a link with pictures and a brief description. http://www.inxs-inc.com/cgi-bin/menu.cgi?a=view_prod&id=4631 The one I have is a larger size, and doesn't have the ports plugged up with bolts, but is otherwise identical. If this is not actually suitable...

Hi everyone, I'm going to be working with liquid nitrogen for the first time and have some questions about valves. We would have prefered to work with a non-pressurized dewar, for the sake of simplicity and safety, but meager budgets led us to a used Alloy Products 304 stainless pressurized...