PCB means polychlorinated biphenyls, a family of chlorinated chemicals historically used in some dielectric fluids because they are very stable and have favorable electrical properties. Today they are heavily regulated due to toxicity and persistence in the environment. Regulations usually define concentration thresholds that determine labeling, handling, transport, storage, and disposal requirements. In practice, identifying PCB content is critical during decommissioning and spill response because it changes PPE, cleanup methods, permitted contractors, and waste classification. Even trace contamination can trigger strict compliance steps and documentation obligations.
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