Cargill transformer oil, particularly their FR3 natural ester fluid, is used for insulating and cooling transformers. It is a biodegradable, vegetable-based oil that offers excellent dielectric properties and fire resistance. Cargill’s transformer oils are designed for use in both new transformers and retrofitting existing ones, providing an environmentally friendly alternative to traditional mineral oils. They are commonly used in transformers that require high fire safety standards and in environmentally sensitive locations.