1. Sheet rack
Manufactured by cold processing, fine, good quality, durable, most of the non-metallic frames are made of carbon crystal frame made of sheet material: it is characterized by high strength, strong, but the material is relatively brittle, and it is easy to be impacted in winter. Brittle cracks, the way to distinguish the carbon crystal frame is: there are obvious cutting marks on the temples.
2. Epoxy resin
Light specific gravity, bright colors, good elasticity, and long life. Epoxy resin was first developed by European eyewear companies and mainly used to manufacture famous brand frames such as CD and Dunhill. The method to distinguish epoxy resin is that there is no core at the temples, while the acetate frame has metal cores. In addition, the color of the epoxy resin frame is brighter.
3. β-TiTAN titanium alloy
Refers to a special alloy formed by mixing pure titanium (70%) and rare metals such as cobalt and chromium (30%). Ultra-light and super-elastic frames can be made very thin. Because it is an alloy of titanium with rare metals such as cobalt and chromium, it is very stable and will not cause skin allergies. It will have greater development and popularity in the next few decades.