Sapphire has the characteristic of high hardness, high strength, high transmittance, and high resistance to thermal shock quality factor. With excellent performance on thermal shock resistance and abrasion resistance, it can be widely applied to high speed working photoelectric equipment and intelligent high speed dome camera in airborne, shipboard, space-borne, submarine-based, land-based field. Specifications Crystal orientation: C, A, M optional Diameter: Dia20 – Dia300 mm Radius of curvature: R10 - R150 Wall thickness: > 1mm Edge thickness difference: <= 0.02mm Total thickness variation: <= 0.05mm C axis deviation: <= 2º Centration: <= 2 arc minutes Surface Quality： Better than 60-40 Power N: <= 5 fringes Irregularity △N: <= 1 fringe