Flammability
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Flammability is a Stat: How easily an object catches fire and how strongly it burns.
Pawns, including both humans and animals, generally have a base flammability of 70%. Mechanoids have a base flammability of 0%.
Phoenix armor 
reduces the flammability of its wearer by 68%.
For specifics on the process by which flammability affects the likelihood of being set on fire, see Flame.
Note that having a flammability of 0% only prevents the item/pawn/etc catching on fire, it does not prevent taking Flame damage. For example, while a stone wall will not be ignited by molotov cocktails, and won't continue to burn, it will take the 10 flame damage from the initial attack. Similarly, a pawn requires Armor - Heat to actually mitigate flame damage taken.
Some things, such as the buildings found in mech clusters , have both a flammability of 0% and are immune to flame damage but these are separate effects.