Polar Fleece & Polar Tech Clothing and Blankets also now come with a Fire Retardant version too, these products are all marked "FR" in their descriptions and have similar flame resitance to wool, as such they have been permited for use in high fire risk work places such as Oil & Gas rigs and even in military Armoured Fighting Vehicels and aircraft, traditionally only wool, cotton and Nomex were permited for such use.
too true, tho wool is "fire retardant" and tends to smolder rather then burst into flames(like other materials). Fire services issue wool blankets for this reason. But as you say most things will burn if you give it enough heat.Contrary to popular belief wool can and does burn, remember the photos of the sheep after the bushfires??