Messi Biology states that behind the thin, light, and high-definition screens of smartphones lies a key fundamental material—99.9% high-purity magnesium oxide (MgO). As an indispensable functional additive in the production of mobile phone screen substrate glass, its extreme purity and stable performance provide core support for the formation, quality, and production efficiency of glass substrates. It is an irreplaceable key auxiliary material in modern display panel manufacturing.
Mobile phone screen substrate glass demands rigorous standards for purity, flatness, light transmittance, and stability. With its high purity and low impurity characteristics, 99.9% high-purity magnesium oxide has become the ideal raw material for high-end substrate glass production. Its primary core function is fluxing and viscosity reduction. During the high-temperature melting process of substrate glass, the glass liquid has high viscosity and is difficult to melt, which not only consumes massive amounts of energy but also exacerbates the corrosion of furnace equipment. As an efficient fluxing agent, high-purity magnesium oxide effectively breaks down the molecular structure of the glass melt, significantly reducing the high-temperature viscosity of the glass liquid and substantially lowering the melting temperature. This optimization directly achieves energy savings of 10%–15%, reducing production costs while minimizing erosion of the furnace body by the high-temperature melt, thereby extending furnace life and improving production line stability.
Secondly, high-purity magnesium oxide effectively inhibits crystallization, ensuring the optical quality of the screen glass. During the cooling and annealing process of the substrate glass, if crystal precipitation occurs internally, it will form visible crystal points and streaks, which seriously affect screen light transmittance and display uniformity, leading to product rejection. High-purity magnesium oxide can delay the growth rate of internal crystals and broaden the stable formation zone of the glass. This allows the glass to maintain a uniform amorphous state during the cooling process, eliminating crystal points and streak defects at the source. This ensures that the substrate glass is highly transparent with a uniform texture, meeting the extreme requirements for optical performance in high-definition screens.
Furthermore, it can precisely control the hardening rate to adapt to high-end molding processes. Currently, mobile phone screen substrate glass mostly utilizes precision molding technologies such as high-speed rolling and overflow down-draw. These processes have strict requirements for the hardening speed of the glass—if it hardens too quickly, flatness is compromised; if too slowly, it cannot keep up with high-speed production rhythms. High-purity magnesium oxide can precisely regulate the hardening speed of the glass liquid to perfectly match the high-speed operation of the molding equipment. This ensures that the substrate glass achieves uniform thickness and a flawless surface during the molding process, significantly increasing the yield rate of the substrates and providing a process guarantee for the mass production of ultra-thin and flexible screens.
From energy saving and cost reduction to quality improvement, and from process adaptation to performance optimization, 99.9% high-purity magnesium oxide permeates the entire production process of mobile phone screen substrate glass. It plays a critical role despite its small dosage, acting as the “invisible hero” that supports the high-definition, thinness, and stability of smartphone screens. It has also become a typical example of high-purity fine chemicals empowering high-end manufacturing in the field of display materials.