高性能，低成本。材料的一致性好。折射率的均一性好。

应力双折射低。气泡与条纹度少，多种供应形式，可提供光学原材料， 光学毛坯，光学零件等。

       High performance, low cost, good material consistency. Good homogeneity of refractive index, few bubbles and stripe, various supply forms, such as optical raw materials, optical rough,, optical parts, etc