OEM AR coating sapphire watch glass disc/plate

OEM AR coating sapphire watch glass disc/plate   Core Material & AR Coating Advantages ​Sapphire Glass Base: Made from synthetic sapphire (aluminum oxide, Al₂O₃) via a high-temperature crystallization process. With a Mohs hardness rating of 9H, it is 5x harder than mineral glass. This ensures it resists daily scratches from keys, coins, or surfaces, maintaining a pristine appearance for years. Additionally, sapphire glass has excellent thermal stability (temperature: -50℃~300℃) and chemical resistance.Transparent Glass Windiow​ Dual-Side AR Coating: A thin, multi-layer dielectric coating applied to both sides of the sapphire disc/plate. Unlike single-side coatings, dual-side AR treatment reduces light reflection from ~8% (uncoated sapphire) to <0.5% per side—total reflection <1% for the entire glass.   Key Technical Features​​ Ultra-Flat Surface: Achieves a surface flatness of ≤λ/4 through precision polishing, ensuring no optical distortion and a smooth, seamless fit…