I wonder if there have been any studies done that show the number of small plane crashes and of these crashes, what percentage do the planes burn on impact. I follow a lot of outdoor related emergency related news (thanks to Google RSS) and it seems to me that most small planes do not burn on impact. If this was the case, I would assume that the risk of using synthetics is low in comparison to the benefits it provides. Perhaps wool clothing would be a better choice, however I am sure that more knowledgeable people like Doug could provide better answers though.