ultralo1 welcome to XtremeSystems, and to this thread

Also thanks for the lead on the propane, I'm sure several people around here will be most interested in getting there hands on some non camping stove R290

Here is a more direct link to the propane info page on the site: medical grade propane

It's nice that they sell it in relatively small quantities (14 ounces), since it doesn't take much to charge up the systems being built around here, and It wouldn't be cheap if you had to buy 100 lbs of the stuff.

Although I never had given it the chance it deserved, I don't see why this in combination with some good quality butane, wouldn't work well for the liquid charge in the AC-2 unit.

Obviously I got your email, and it's cool that MG Pony pointed you in my direction. When everyone finds out what you do for a living, and the access you have to some very pro chilling equipment, as well as some exotic refrigerants, they'll be picking your brain in no time.

It's great to have another experienced person on board from this field of interest