1. rich experience for ir pass filter 2. No bubble 3. good surface quality 4. the competitive price 5. good reputation ir pass filter1.Material: Black Optical Glass (HWB760, HWB780, HWB800, HWB830, HWB850, HWB900, HWB930) and red glass, HB600,HB610,HB630,HB640,HB650,HB670,HB685,HB700,HB720)200 nm to 2500 nm spectral range of a full range of optical glassRG760 RG780 RG800 RG830 RG850 / RG610 RG630 ...