PCB Oil Contamination Contamination

PCB-contamination arises from polychlorinated biphenyls leaking in electrical equipment, so it forms thin oily layers during long exposure. This contamination shows sticky persistence and chemical stability, distinguishing it from less adhesive oils because residues bond tightly without easy dissolution. On steel and concrete in transformer housings, it penetrates pores so removal challenges include deep embedding and environmental risks, yet laser cleaning ablates layers precisely without damaging substrates.