Profile: Koch Crystal Finishing, Inc. is an optics manufacturer. We specialize in IR spectrophotometer cell windows, CO2 protective windows, custom optics and optics packaging. Optical packaging is a protective cover for polished optical surfaces, also called clam shells. It is easy to use, store, and can also be reused.Optical cover eliminates multiple handling, wrapping and taping, resulting in less damage. They are non-out gasing for all UV optics, and are available in different shapes and sizes. Cell windows are made up of different materials like KCl, KBr, NaCl, CaF2, BaF2 and CsI.