... 5. good reputation ir pass filter1.Material: Black Optical Glass (HWB760, HWB780, HWB800, HWB830, HWB850, HWB900, HWB930) and red glass, HB600,HB610 ... into2 into4.Thickness business trip:±0.01mm±0.02mmThe ir pass filter can be used in infrared gas analyzer, infrared cameras, night ... , security cameras infrared night vision surveillance, such as police, military and other high-tech products.