... 250mm 4. Min.thickness=90um Sapphire Windows Worldhawk is a provider of sapphire products for various industrial applications, such as ... under extreme conditions. We offer high volume precision sapphire products, including sapphire wafers, windows, prisms, lenses, substrates, watch ... 0.25mmCoatingUncoated, AR, HR, etc.Note for sapphire window:(1). Custom-made sapphire windows at any size from Φ1.0mm ...