12-Inch Sapphire Substrate for Advanced Semiconductor Packaging Research and CoWoS-L-Related Applications Product Overview Our 12-Inch Sapphire Substrate is a large-diameter single-crystal sapphire wafer designed for advanced semiconductor research, precision material processing, and customized wafer-level applications. With a nominal diameter of 300 mm, this substrate provides a uniform crystalline platform for thin-film deposition, surface engineering, and the development