Used primarily in industrial applications, 2,2',4,4',5-Pentachlorobiphenyl is a component in dielectric fluids for transformers and capacitors due to its stability and insulating properties. It has also been utilized in heat transfer fluids and hydraulic systems. However, its use has significantly declined due to environmental and health concerns, as it is a persistent organic pollutant. It is now mainly studied for its environmental impact and behavior in ecosystems, particularly in bioaccumulation and toxicity research. Regulatory measures have been implemented to phase out its production and use globally.