coc是什么塑料

环烯烃共聚透明树脂，光学性能类似于PMMA，低双折射率，低吸水性、高刚性。就是价格比较贵，否则PMMA和PC的市场大半要被它抢走。

　　Cyclic Olefin Copolymer (COC) is an amorphous polymer made by several polymer manufacturers. COC is a relatively new class of polymers when compared to polypropylene and polyethylene. This material is primarily used in applications requiring glass-like clarity including lenses, vials, monitors, and medical devices.
　　环烯烃共聚物（COC）的是一种非晶态的高分子聚合物，只有几个别制造商生产。COC是一个相对较新级别的聚合物，与聚丙烯和聚乙烯相比。这种材料主要用于要求玻璃般清晰产品，包括镜头，小瓶，显示器和医疗设备。

　　COC has a transparency similar to glass in its natural form. Typical COC material will have a higher modulus than HDPE and PP. Due to its chemistry, the higher the modulus, the more brittle it becomes. COC also has a high moisture barrier for a clear polymer along with a low absorption rate. In medical applications, COC is noted to be a high purity product with low extractables. COC is also a halogen-free product.
　　环烯烃共聚物的自然形态，类似玻璃。典型环烯烃共聚物材料，比高密度聚乙烯和聚丙烯模量较高。由于其化学，模量越高，就越变得脆