Long winded Patent discloser on Fracing with PropaThis is a very long dry read on fracing with propane and how in works. There are chemical agents mixed to the LPG to suspend proppants during blending and pumping. (Chemicals undisclosed) Few will read thispatent document but if you want to know this is the link.
https://www.faqs.org/patents/app/20100051272
If your going to have a look you may want to skim thru it until you find something that peaks your interest.