As a leading industry player in the large-size sapphire crystal industry, TDG Holding (600330) and its subsidiary, TDG YinSha New Materials, have been committed to breaking through the processing and preparation technology of large-size sapphire crystal growth and substrate over the past few years. In October 2023, the company grew a super-large sapphire crystal using self-developed core equipment, with a crystal quality of 1080 kg, a height of 800 mm, and a diameter of 750 mm (maximum diameter). After more than five months of process optimization and stabilization, it has now entered the trial production phase. The 1000kg-grade sapphire crystal developed this time can achieve the output of optical-grade chips with a diameter of over 700mm or the largest size of 780mm × 550mm for sapphire window films, which fills the application demand for large-size high-quality optical windows in the domestic market. At the same time, it will help achieve a technological breakthrough in the materials for large-diameter substrates (6-8 inches) required in the Mini/Micro LED field, and further promote the scale application of sapphires in special optical engineering, micro-LED displays, integrated circuits, 5G communications, consumer electronics, and other fields, demonstrating the company's innovation power in the semiconductor industry chain.