Sapphire window glass, also known as hardened glass or high and low temperature resistant glass, is a transparent or semi transparent glass material made by fusing silicon dioxide (SiO2) with other components such as aluminum oxide (Al2O3). It is widely popular due to its high hardness, wear resistance, and scratch resistance, and is commonly used in some smartphone screens, eyeglass lenses, watch glasses, etc.

Although sapphire window panels have high hardness, this does not mean they are "indestructible". Brittleness is also an important characteristic, which means that it will also break when subjected to external forces beyond its bearing capacity. When subjected to severe impact or concentrated force in a small area, it may also rupture, which requires special attention in many application scenarios. For example, in the design of smartphones, although the screen adopts a sapphire mirror, a protective layer of tempered glass or plastic still needs to be added to absorb the impact force, in order to reduce the risk of screen breakage when dropped.

Although sapphire has some excellent physical and chemical properties, its production cost is high and processing difficulty is high. It also has a relatively high melting point, which makes it more stable and less prone to melting in high temperature environments. At the same time, it has good chemical stability, strong corrosion resistance, and is not easily reactive with other substances, which are the reasons why it can maintain its performance in various environments. These factors limit its wide application, and when choosing to use sapphire products, it is necessary to balance their durability and cost-effectiveness.

Sapphire window plates are transparent synthetic sapphires that exhibit excellent physical, chemical, electrical, and optical properties. From high thermal conductivity, high strength, and scratch resistance, these excellent properties enable sapphire to be applied in multiple fields. Although sapphire has high hardness and good wear resistance, it is still relatively brittle and easily shattered when subjected to strong impacts. Therefore, when using its designed products, it is necessary to reduce the risk of fragmentation through structural design optimization and other protective measures to ensure that the material properties are fully utilized.