Home Resource Center Product Data and Related Literature Inorganic Chemicals Fluorides Flourides Resources Fluorides Cut Sheet Materion Advanced Chemicals, formerly CERAC, Inc., offers high quality fluorides manufactured to your precise specifications. Aluminum Fluoride AlF3 for Optical Coating CIROM-IRX™_A Non-Radioactive Replacement for ThF4 A non-radioactive replacement for thorium fluoride is now available. CIROM-IRX™ can be used for applications from low-loss laser mirrors to filter & AR coatings. Magnesium Fluoride MgF2 for Optical Coating Thorium Fluoride Overview Thorium Fluoride for Optical Coating Ytterbium Fluoride YbF3 Ytterbium fluoride, YbF3, is a low-index film material that exhibits good transparency from the UV through far-infrared regions. The films are insoluble and show low stress, making YbF3 a useful substitute for ThF4 in many IR applications. Yttrium Fluoride YF3 for Optical Coating