Electrical industry professionals are familiar with ester-based insulating oils, whether they are of vegetable or synthetic origin, for their excellent fire-resistance (class K oils) and for their biodegradability. These are the insulating fluids recommended both to eliminate the risk of transformer fire as well as to reduce the risk of pollution in the event of a leak.
All fire safety professionals know that, when filled with mineral oil, transformer fires are sudden, dramatic and can have terrible consequences.