On Fri, 8/1/14, Paul Mueller <paul.mueller.iii@xxxxxxxxx> wrote: > In my cryogenics training years ago, I was told that LOX spilled on asphalt would create a gel that was very impact sensitive. I don't know if it's true or not. Sure, asphalt paving always has coated sand grains loose on the surface. Add LO2 in the right proportions and get instant monopropellant gel. I'm guessing sand particle friction initiates the reaction.