Transformer oils are specially designed fluids used to insulate and cool transformers, ensuring their efficient and safe operation. These oils offer high oxidation stability, low gassing tendencies, and ultra-low sulfur content, reducing the risk of corrosion. Both naphthenic and iso-paraffinic grades are available, tailored to international standards for various voltage classes, including ultra-high voltage transformers. Additionally, transformer oils are fire-resistant and provide superior electrical and thermal properties for modern transformer technology.