LM5L-07

　　Polyethylene is a thermoplastic resin obtained by the polymerization of ethylene. It is odorless, non-toxic, and feels waxy. It has excellent low-temperature resistance (minimum service temperature can reach -70°C to 100°C), good chemical stability, and is resistant to most acid and alkali corrosion (not resistant to oxidizing acids). At room temperature, it is insoluble in general solvents, has low water absorption, and excellent electrical insulation.

　　Polyethylene is classified into high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE) depending on the polymerization method, molecular weight, and chain structure. The raw materials used for plastic packaging bottles are mostly high-density polyethylene and low-density polyethylene. Low-density polyethylene is mainly used in the packaging of dropper bottles; it is soft to the touch and easy to squeeze, but it is not heat-resistant and will melt above 80 degrees Celsius, while high-density polyethylene is resistant to low temperatures (-70-100°C) and has good flexibility. Common processing techniques for polyethylene raw materials include injection molding, extrusion, and blow molding. The processing method may vary slightly depending on the bottle type and application.