Dear Sir, This is David Lee who is marketing and sales director of Tae Young Optics Co., Ltd.(TYO).TYO is KOREAN optical company. TYO have experienced making UV-IR cut off filter for Auto Welding Darkness Cartridge.And TYO is now suppling the filter to Auto Darkness Welding Helmet manufacturers.Aleasdy TYO have experimented and experienced the reliability test, mechanical properties so on....according to ANSI spec. May I explain for TYO more detail? TYO has optical thin film deposition technique of UV , VIS' , NIR,MIR,FIR andTYO has 4 spectrophtometer, 2 of PERKINELMER, 2 of HITACHI.One of them is FTIR for FIR Range, 2um ~ 13.5um(Narrow Band Pass Filter for SO2, CO2, CO Gas Sensor and CO2 LASER Optics application) . Optical subsidiary assembly technique, for examplale Lens ass'y, detection optical system so on.... Please visit www.tyoptics.com !And When you have any question, please don't hesitate call and e-mail me. And may I send 2-kinds of Welding Filter which is deposited metal and dielectrics to defense UV, NIR? Thank you. Best regards, David / General DirectorTaeyoung Optics Co., Ltd. 616-92 Ganseok 4-dong, Namdong-gu, Incheon, SEOUL, 405-810, KOREA Tel : 82-32-865-0451 Fax : 82-32-865-0450 Cell : 82-10-7321-7423
