Friday, July 20, 2012

CryoBUG Iso-Butane charge experiments about to begin

I got my inexpensive R-600a (Iso-Butane) last week. Thanks to a friend who steered me in a direction I would have never thought of, I was finally able to get my hands on enough of this refrigerant to charge my CryoBUG well over 20 times. The source turned out to be an Ebay store called Med-Supply-Online who stocks a 5.5oz disposable cylinder of Iso-Butane used for fueling a Dental sterilizing burner. As you can imagine this has to be very pure, and according to the MSDS it is.

So who makes this stuff? A company called Wall Lenk does. And when checking online it varies from about $9.00 up to $12.00 per cylinder. Unfortunately most of the sources I found wont sell to individuals unless you are a dentist. But luckily this isn't a condition at Med-Supply-Online.

So here's a look at most of my stash...

After getting the cylinders as pictured, I discovered that I had no way to get the butane out of them. The fitting at the top is actually much more then a piercing type as used on R-134a cans. This one has a depression valve incorporated, that will shut-off if the burner head is removed. So I had to also order a burner head as well, and then modify it for use with a standard 1/4" refrigeration hose (I also got one more cylinder of butane fuel with the purchase of the burner head).

Then to make things easier to deal with, I transferred all 5 butane cylinders into a refrigerant recovery tank.

So I now have 27 ounces (765 grams) of pure Iso-Butane, and have already gone ahead and recharged CryoBUG for a test tomorrow.

The interesting thing I noticed when charging my unit, was that the R-170 (ethane) appears to have a much better affinity for the "Iso" versus the "N" type butane. Or in other words it soaks in more, yielding a lower vapor pressure. This could be very helpful.


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