Objective: To identify low-density polyethyene(LDPE) eye drop bottles adulterated with other plastics and to study the differences between LDPE plastic pellets and recycled plastics. Methods: The melting point of LDPE eye drop bottles and plastic pellets of eight manufacturers were determined by differential scanning calorimetry(DSC). The melting curve, oxidation induction temperature(dynamic OIT) and oxidation induction time(isothermal OIT) in LDPE plastic pellets and recycled materials with different times(one, three and six) were obtained by DSC method. Results: DSC can not only identify LDPE materials,but also distinguish the LDPE plastic granules and recycled plastics. Conclusion: DSC analysis can provide the foundation of identifying material consistency in product and the raw materials.
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