On December 31, Gelonghui reported that TDG Holding (600330.SH) stated on the investor interaction platform that Sapphire crystals are important foundational materials in modern industry, boasting excellent optical, mechanical, and chemical stability. They possess high strength, high hardness, and corrosion resistance, capable of operating at temperatures near 2000 degrees Celsius, with good transmittance across ultraviolet, visible, infrared, and microwave bands. Currently, the primary applications of sapphire materials are concentrated in two major areas: LED chip substrates and window materials. Sapphire substrate materials are crucial foundational materials for new displays such as Mini-Led and Micro-Led, and in recent years, sapphire window materials have also been increasingly used in various Smart Clothing, including AR/VR/MR devices.