Sapphire has the characteristic of high hardness, thermo stability, excellent thermal conductivity, infrared transmitting, anti-chemical corrosion, good chemical stability, thermal performance, perfect electrical specification and dielectric property. It is widely applied to infrared photoelectric and medical equipments. Specifications Crystal Orientation: C, A, M optional Orientation deviation: < 2º Dimension tolerance: ± 0.10mm Surface Quality: 40 – 20 Surface accuracy N: 2 lambda Irregularity △N: Lamda/4