I recall seeing a training video around 30 years ago giving a sales pitch on Skydrol and its properties. This was true propaganda put out by Monsato ( manufacturers) they showed an engineer drop his cigerette into a tray of oil, and after retrieving it continuing to smoke it. Another clip showed an engineer( stunt man) dropping a contact lense into a tray of oil, he picked it up and put it straight back into his eye, never flinched a muscle.
I wonder where these engineers(?) are now, possibly moved on to that great hangar in the sky.
Of interest to your studies is that any oil has the potential for fire, when any of these oils are released through a pin hole in a hyd. system of 3000psi an ignition source is all that is needed. My belief is that the Airbus A380 will incorporate systems as high as 4000psi.
More details on these oils can be source if you do a search through 'MSDS' specs and safety precautions.