Used primarily as an intermediate in the synthesis of dyes, pigments, and other chlorinated organic compounds. It serves in the production of specialty chemicals for agrochemicals and pharmaceuticals where a polycyclic backbone with chlorine substitution is required. Due to its stability and lipophilic nature, it has been explored in research settings for environmental studies on persistent organic pollutants. Historically, it was used in wood preservatives and fungicides, though such applications have declined due to toxicity and environmental persistence concerns. Its role now is mostly confined to laboratory and industrial research, particularly in studying degradation pathways of halogenated aromatics.