Sapphire Sapphire is widely used in LED lighting and display applications, and has been expanding with the market expansion in smart terminals in recent years. In response to the industry's demand, Sapphire has launched a substrate process covering waxing, grinding, polishing, and wafer thinning processes. In the substrate manufacturing process, Sapphire has advocated innovative processes to the industry, while the wafer backside thinning process is once again an industry-leading process with Kellogg's machines and consumables to effectively increase customer productivity and significantly reduce production costs.