... 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 ... /4 into2 into4.Thickness business trip:±0.01mm±0.02mmThe ir pass filter can be used in infrared gas analyzer, infrared ...