Low-density polyethylene (LDPE) is a highly branched thermoplastic plastic produced by the free radical polymerization of ethylene under high pressure. It can be regarded as the “king of soft and transparent plastic packaging films” - due to the numerous short and long branches on the molecular chains that hinder crystallization, it has a low density (0.915-0.935 g/cm³), good flexibility, high transparency, excellent low-temperature resistance (-50°C still maintains flexibility), good electrical insulation and water resistance, but poor heat resistance (melting point is approximately 105-115°C). It is widely used in cling films, garbage bags, shopping bags, agricultural mulch films, extruded bottles (such as earphones), insulation layers of wires and cables, and food packaging, etc., in situations that require softness, transparency and moisture-proofing.