低密度聚乙烯是高压下乙烯自由基聚合而获得的合成树脂, 故又称“高压聚乙烯”。由于分子链中含有较多的长短支链，因此产品密度较小，柔软，耐低温性、耐冲击性较好； 具有良好的化学稳定性，除强氧化酸外，一般情况下耐酸、 碱、盐类的腐蚀作用; 具有优异的电绝缘性能; 水蒸气透过率低，流动性好，具有良好的成型加工性能，适合注塑、挤 塑、吹塑、旋转成型、涂覆、发泡工艺、热成型、热风焊、热焊接等热塑性成型加工的各种工艺。
Low-density polyethylene（LDPE）is a synthetic resin using a high pressure process via free radical polymerization of ethylene and is therefore also called “high-pressure polyethylene”. Since its molecular chain has many long and short branches, LDPE is less crystalline than high-density polyethylene (HDPE) and its density is lower. It features light, flexible, good freezing resistance and impact resistance. LDPE is chemically stable. It has good resistance to acids (except strongly oxidizing acids), alkali, salt, excellent electrical insulation properties. Its vapor penetration rate is low. LDPE has high fluidity and good processability. It is suitable for being used in all types of thermoplastic processing processes, such as injection molding, extrusion molding, blow molding, rotomolding, coating, foaming, thermoforming, hot-jet welding and thermal welding.
1. 主要用于做薄膜产品, Principally used for making films,
2. 还用于电线电缆绝缘和护套，Production of wire & cable insulation sheath,
3 注塑制品, Injection-molded products,
4. 挤塑成型 管材、板材、异型材等制品,Extrusion-molded tubes, plates, wire & cable coatings and profiled plastic products,
5. 吹塑成型中空制品。Blow-molded hollow products such as containers for food.