What is Low-Density Polyethylene (LDPE)? Low-Density Polyethylene (LDPE) is a thermoplastic polymer renowned for its flexibility, lightweight structure, and low density (0.910–0.925 g/cm³). First synthesized in 1933, LDPE’s highly branched molecular structure reduces crystallinity, giving it superior pliability compared to rigid plastics like HDPE. Its transparency, moisture resistance, and adaptability to cold environments make it ideal for packaging,