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CR39 Polaroid resin lens features

A. Low density: Because of the gap between the molecular chains, so the number of molecules per unit volume is small, determines the advantages of resin lenses: low specific gravity, light texture, is a glass lens 1/3-1/2;

CR39 Polaroid resin lens features

B. Moderate refractive index: CR-39 propylene diethylene glycol carbonate, the refractive index of 1.497-1.504, the current Shenyang market sales of resin lenses refractive index of non-spherical ultra-thin hard film resin lenses, refractive index can reach 1.67, now has 1.74 refractive index of resin lenses.


C. Surface hardness is lower than glass, easy to be scratched by hard objects, so need to be hardened, the hardened material is silicon dioxide, but hardness can never reach the hardness of glass, so the wearer should pay attention to the maintenance of lenses;


D. Elasticity is 23-28 times that of glass sheets because of the displacement space between organic molecules. It has decided that another characteristic of the resin sheet is good impact resistance. European, American and Japanese countries prohibit children under sixteen from wearing glass lenses.


E. auxiliary function: it can be added to prevent harmful rays and discoloration.


F. processability: good, feasible, full frame, half frame, frameless multi type processing. It can also be penetrated to dye the lenses into a favorite color.


G. Chemistry: Because it is an organic compound, it is absolutely prohibited to wear in acid and alkali environment.


H. Thermal properties: should not be used in more than 60 degrees of environment, otherwise the surface antireflection film will break down, and even lead to antireflection film shedding phenomenon.


I. price: with quality, function, brand and grade.


J. Lens Size Design: According to the F D A "F. D. A" standard, the center thickness can be designed as low as 0.6 mm, but the strength requirements are reduced accordingly. For this reason, manufacturers in Europe, the United States, Japan and other countries generally design the center thickness of lenses with myopia and hyperopia above 100 degrees to be more than 1.0 mm to ensure that The overall strength of lenses.


CR39 Polaroid resin lenses


CR39 Polaroid resin lens advantages