In the heat treatment process, physical tempered glass is prone to visible optical distortion, that is, "refraction" or "stress spot" due to uneven cooling or equipment factors, which not only affects the appearance, but also causes visual fatigue and even misjudgment under specific light, which seriously restricts its application in high-end window, museum showcase, precision instrument window and other fields that require high optical quality. The ion tempering technology developed by Ming dun Company provides a perfect solution to this problem. The ion strengthening process takes place at the molecular level. Through the uniform exchange of sodium ions and potassium ions, gradient strengthening in the depth direction is formed on the entire glass surface, and its stress changes continuously and smoothly. Different from the violent and irregular surface stress distribution caused by the rapid cooling of physical tempering, the compressive stress layer formed by this chemical method is extremely uniform and will not cause the sudden change of the internal refractive index of glass. Therefore, the Ming-dun ion tempered glass has ultra-high mechanical strength, while maintaining a high optical quality comparable to that of the original float glass, with almost no stress spots and no image distortion. This means that designers and engineers no longer need to compromise between "safety" and "beauty and clarity". Ming dun products have successfully achieved the unity of impact penetration resistance and excellent optical transparency, opening up new possibilities for high-end commercial space, art exhibition, optical devices and other fields, making security guards "invisible" in the pure vision.
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