[Is Pepper Spray Flammable?]
POLICE MAGNUM spray solution is non-toxic and non-flammable. This means that although it causes some extremely painful and uncomfortable side effects, they are temporary. Furthermore, use of the spray does not result in any long-term after effects.
http://pepper-spray-review.toptenreviews.com/police-magnum-review.html
Not sure about it being flammable either. I have the gel Pepper Spray. It’s suppose to not come back on yourself.