1·The classification and characteristics of the medical plastics are introduced. The application of PVC, liquid crystal polymer, PMMA, etc. in the medical and hygienical fields is explained.
介绍了医用塑料的分类、特点，阐述了聚氯乙烯、液晶聚合物、聚甲基丙烯酸甲酯等在医疗器械、医疗用品、人工脏器等方面的应用；
2·Materials like PMMA, optical elements, or other annealed plastics exhibit very low birefringence activity and thus require a different approach.
材料如聚甲基丙烯酸甲酯，光学元件，或其他退火塑料很低的双折射活动，因此需要不同的方法。