What are common names used for electrical transformer oils?

Common names include mineral insulating oil, transformer mineral oil, insulating oil, dielectric oil, and transformer oil. You will also see branded families like Shell Diala, Nynas Nytro, and other supplier trade names. In higher fire safety or environmental applications, common names also include natural ester fluid, synthetic ester fluid, and silicone insulating liquid. The correct naming matters because standards, compatibility, and fire classification depend on the fluid type.