1. rich experience for ir pass filter 2. No bubble 3. good surface quality 4. the competitive ... Optical Glass (HWB760, HWB780, HWB800, HWB830, HWB850, HWB900, HWB930) and red glass, HB600,HB610,HB630,HB640,HB650,HB670,HB685,HB700,HB720 ... into4.Thickness business trip:±0.01mm±0.02mmThe ir pass filter can be used in infrared gas analyzer, infrared cameras, night ...