If its flamable its NOT legal for automotive use.

Bill
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 Having read the original posts on this material, and in the process of adding
 A/C to a westy, I purchased some. I ran the info by a friend knowledgeable in
 A/C and other matters associated with this field (I am not an expert) just to
 be sure it was safe. It is not. This is a mix of propane and butane. It may
 be legal but certainly not something I want in my van. A real issue is if
 having the AC serviced by a tech unfamiliar with this material. He may use a
 flame type leak detector with catastrophic results.
 Propane was used many years ago as a refrigerant because of its outstanding
 thermal properties - but one drawback - it explodes when ignited (think
 fuel/air bomb). Thats why they don't use it anymore. I thought I would post
 this just in case some one was considering using ES-12. Just my opinion, hope
 it helps.