Used primarily as a dielectric fluid in electrical equipment like transformers and capacitors due to its excellent insulating properties. It also served as a plasticizer in various industrial applications, enhancing the flexibility and durability of materials such as paints, adhesives, and sealants. Additionally, it was employed in heat transfer systems and hydraulic fluids for its thermal stability and non-flammability. However, its use has been significantly restricted or banned in many countries due to environmental and health concerns related to its persistence and toxicity.