Jiayu Product Knowledge: CR39
CR39 is carbon acid propylene acetic acid, or allyl diethylene glycol carbonate, which is the most widely used material for the production of ordinary resin lenses. CR39 was used in the production of ophthalmic corrective lenses from 1955 to 1960. It was a generation of ultra-light, impact-resistant resin lenses. CR39 is a kind of thermosetting material. The monomer is in a liquid state, and it is polymerized and cured under heating and adding a catalyst. Polymerization is a chemical reaction, that is a new polymer molecule composed of several monomers of the same molecular structure, with different lengths and properties. As an optical lens, the parameters of CR39 material properties are very suitable: refractive index of 1.5 (close to ordinary glass lens), specific gravity of 1.32 (almost half of glass), Abbe number of 58~59 (with little dispersion), impact resistance, High light transmittance, can be dyed and coated. Its main disadvantage is that its wear resistance is not as good as that of glass, and it needs to be coated with anti-wear film. The resin lens can be processed by the mode pressure method to process the curvature of the lens surface, so it is very suitable for the production of aspheric lenses.
Advantages and disadvantages of CR39 resin lens:
CR39 resin lens advantages: light weight, strong impact resistance, good safety, good chemical stability, good light transmittance, some coloring, UV absorption, and good molding processability. Disadvantages of CR39 resin lens: low hardness, easy to scratch, poor heat resistance, and easy to deform. The city we live in is full of dust and oil secreted by the human face. If you don't pay attention to maintenance, the lens will be damaged in half a year. The CR39 resin lens is processed by high temperature or ultraviolet curing of liquefied monomers. As the service cycle becomes longer, the environment and temperature change, the film layer on the lens surface and the material of the lens itself will undergo physical changes. The film layer can be viewed under a microscope. It will become uneven, and the local luminosity of the material itself will be different from when it was prepared, which will cause light scattering, lower comfort, and symptoms of dry and swollen eyes after long use. At this time, you should replace the lenses. The time is about one and a half to two years.
The function of CR39 resin lens: In life, too many light sources will produce harmful light, especially sunlight; the light emitted from sunlight includes three types: visible light, infrared light, and ultraviolet light. Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.; among the rays released by sunlight, IR (Infra-red) infrared rays (750mm) and above, visible light (310～780nm); ultraviolet rays are divided into Above UVA, UVB, UVC (310nm), bluelight (Bluelight) among them UVA, UVB, UVC are harmful light, if exposed for a long time will cause damage to the body, UVB has a serious impact on eyesight, (TanningRay) is burning black Skin light, most of the corners of the eyes will absorb this UVB light, so be sure to block this light source. CR39 resin lens has the function of polarizing light, so it can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes.
Maintenance method of CR39 resin lens: How to maintain the clarity of CR39 resin lens and the function of blocking harmful ultraviolet rays, which is important for eye protection, has been greatly improved. Especially for distance glasses, because they are often worn and often outdoors, the benefits of resin lenses for the eyes are Ordinary lenses cannot be compared. Proper use and maintenance can keep the lens in good condition for a long time and keep your eyes under better "protection" at any time. The correct maintenance method is to rinse off the dust on the front and back surfaces of the lens with tap water, apply detergent evenly on the surface of the lens, and then rinse off with water. The remaining water on the lens is dried with facial tissues. Generally speaking, the lens clean once every 2 days.
Advantages and disadvantages of CR39 resin lens:
CR39 resin lens advantages: light weight, strong impact resistance, good safety, good chemical stability, good light transmittance, some coloring, UV absorption, and good molding processability. Disadvantages of CR39 resin lens: low hardness, easy to scratch, poor heat resistance, and easy to deform. The city we live in is full of dust and oil secreted by the human face. If you don't pay attention to maintenance, the lens will be damaged in half a year. The CR39 resin lens is processed by high temperature or ultraviolet curing of liquefied monomers. As the service cycle becomes longer, the environment and temperature change, the film layer on the lens surface and the material of the lens itself will undergo physical changes. The film layer can be viewed under a microscope. It will become uneven, and the local luminosity of the material itself will be different from when it was prepared, which will cause light scattering, lower comfort, and symptoms of dry and swollen eyes after long use. At this time, you should replace the lenses. The time is about one and a half to two years.
The function of CR39 resin lens: In life, too many light sources will produce harmful light, especially sunlight; the light emitted from sunlight includes three types: visible light, infrared light, and ultraviolet light. Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.; among the rays released by sunlight, IR (Infra-red) infrared rays (750mm) and above, visible light (310～780nm); ultraviolet rays are divided into Above UVA, UVB, UVC (310nm), bluelight (Bluelight) among them UVA, UVB, UVC are harmful light, if exposed for a long time will cause damage to the body, UVB has a serious impact on eyesight, (TanningRay) is burning black Skin light, most of the corners of the eyes will absorb this UVB light, so be sure to block this light source. CR39 resin lens has the function of polarizing light, so it can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes.
Maintenance method of CR39 resin lens: How to maintain the clarity of CR39 resin lens and the function of blocking harmful ultraviolet rays, which is important for eye protection, has been greatly improved. Especially for distance glasses, because they are often worn and often outdoors, the benefits of resin lenses for the eyes are Ordinary lenses cannot be compared. Proper use and maintenance can keep the lens in good condition for a long time and keep your eyes under better "protection" at any time. The correct maintenance method is to rinse off the dust on the front and back surfaces of the lens with tap water, apply detergent evenly on the surface of the lens, and then rinse off with water. The remaining water on the lens is dried with facial tissues. Generally speaking, the lens clean once every 2 days.
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Xiamen Jiayu Optical Co., Ltd.
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- Address: 厦门
- Phone: 86-592-5203016
- Business Type: Industry & Trading,
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