OREANDA-NEWS. December 5, 2008. Subsidiary Orisil-Kalush, Orisil, ltd. is currently working to implement independent hydrogen generation supply as soon as possible. This is necessary as a financial crisis in Ukraine has complicated Orisil’s plans to lease a caustic soda and chlorine plant, which has been our hydrogen supplier. We sincerely regret the interruption of fumed silica supply to our customers and appreciate your patience as we work through this situation.