CHEXS is an X-ray optics company specializing in thin film coating design, thin film coating development and production, X-ray characterization, simulation, modeling and calibration. CHEXS is a spin-off company from the Space department on the Technical University of Denmark (DTU). DTU space has developed a world leading expertise in X-ray optics for high energy astrophysics missions. CHEXS is based at DTU and utilizes, on a rental basis and as required, the coating and characterization facilities at DTU.