タイトルまたは説明

Ruby ball ,sapphire crystal is one of corundum gemstones. it is  mainly characterized by wear resistance, high hardness, corrosionresistance and small friction coefficient. it is an ideamaterial for precision instrument, machinery and bearing; sapphire glass has good infrared transmission and chemical stability. it is also widely used in all aspects of infrared military equipment, such as far-infraredsight, night vision camera and so on.
Specifications of Sapphire Ball Lens:
Ball lens size range: 0.4mm ~ *0mm
Diameter tolerance: ±0.**1mm
Sphericity: 0.**3mm
Clear Aperture: >*0%
Roundness: Surface Quality: *0/*0
coating: upon customer requirement