[China Glass Net] The lens used for fire is a special blue cobalt glass. Cobalt glass protects against eye irritation and damage, while reducing the brightness of the kiln in order to observe the firing. Cobalt glass lenses are classified into dark, medium and light colors. The fireworker can choose according to his own habits and hobbies. Generally speaking, the color is too deep, and it is not sensitive to the temperature in the kiln. Especially in the case of thin material, it is easy to burn high fire, light-colored glass, and it is more irritating to the eyes, so the medium-colored glass is more suitable. When selecting a lens, one should have a flat surface, see that the object is not deformed, the eyes are not uncomfortable, and the second is transparency. T/C Fill-A-Fill Fabric,T/C Shirt Blouse Fabric,T/C Filling Fabric,T/C Shirt Fabric Shaoxing Yingcheng Textile Co.,Ltd , https://www.sxyingcheng.com
The main raw material for glass lenses is optical glass. Excellent optical properties, not easy to draw, high refractive index. The glass lens has good light transmittance and mechanochemical properties, and has a constant refractive index and stable physical and chemical properties. Glass lenses have more scratch resistance than lenses of other materials, but their relative weight is also heavy, and their refractive index is relatively high: 1.523 for ordinary sheets, 1.72 or higher for ultra-thin sheets, and higher at 2.0.
The main raw material for glass lenses is optical glass. The refractive index is higher than that of the resin lens, so the glass lens is thinner than the resin lens in the same degree. The glass lens has good light transmittance and mechanochemical properties, and has a constant refractive index and stable physical and chemical properties. A lens without color is called an optical white (white film), and a pink film in a colored film is called a Crocks lens (red film). Crockex lenses absorb UV light and absorb light slightly. The glass sheet is superior in optical properties, is not easy to scratch, and has a high refractive index. The higher the refractive index, the thinner the lens. However, the glass piece is fragile and the material is heavy.