... from 1-400mm; 4. For optical use. Application: Used for window material, mask substrate or heat insulation, optics, electronics, medical treatment ... available. Smallest hole is od0.5mm.6, Surface quality :40/20 60/40 80/507, Transmittance >85%8, Coating: high anti-UV ... laser, metallurgical, optical instrument and stage light etc. high temperature window. 1.JGS1( Extreme UV optical quartz glass)It is a ...