New neck hanging reading with magnetic folding convenient resin silicone elderly people's

Polycarbonate (PC) is a polymer with carbonate groups in its molecular chain. It can be classified into various types based on the structure of the ester groups, such as aliphatic, aromatic, and aliphatic aromatic. Due to the low mechanical properties of aliphatic and aliphatic aromatic polycarbonate, their application in engineering plastics is limited.
At present, aromatic polycarbonate has achieved industrial production. Due to the unique structure of polycarbonate, it has become the fastest-growing universal engineering plastic among the five major engineering plastics
characteristic
TR90 material glasses
Compared with nylon material, TR-90 material frames have the following characteristics:
1. Lightweight: Less than half the weight of the board frame, it is made of nylon material, reducing the burden on the nose bridge and ears, making it easier to wear.
2. Colorful: More vibrant colors than ordinary plastic frames.
3. Impact resistance: More than twice that of nylon material, ISO180/IC: 125kg/m2 elasticity, effectively preventing eye damage caused by impact during movement.
4. High temperature resistance: can withstand temperatures up to 350 degrees Celsius in a short period of time, ISO527: anti deformation index 620kg/cm2. Not easy to melt and burn. The frame is not easily deformed or discolored, making it easier to wear.
5. No chemical residue release, meeting the requirements for food grade materials.
The material of TR90 eyeglass frame is much more expensive than other PC, CP and other eyeglass frame materials, and the manufacturing process is also relatively strict, so the TR90 eyeglass frame is several times more expensive than others.
The TR90 material is produced by EMS GRIVORY from Switzerland, and many glasses in China also obtain raw materials through EMS's contacts in China.
The frame of TR-90 has a variety of leg patterns and beautiful printing. In fact, these patterns are a layer of thin film attached to the original TR material legs. Once scratches or sweat soak, some of the film will peel off, causing the entire film layer to peel off and expose the transparent TR material.