What are the common transformers oil names used in utility applications?

Utilities commonly refer to oils by type and standard rather than a single universal name, such as mineral insulating oil, inhibited mineral oil, natural ester fluid, synthetic ester fluid, and silicone transformer fluid. Brand names vary by region and supplier, but procurement generally focuses on compliance with IEC or ASTM specifications and on documented test results. In technical communication, engineers often use terms like transformer mineral oil, ester transformer fluid, and fire resistant silicone fluid to indicate performance class and application suitability.