#R-105 Tio2 is recommended for outdoor plastics, especially PVC window profile applications. #R-105 Tio2 utilizes silica encapsulation technology to minimize interaction of the TiO2 surface with the surrounding environment. This minimizes "chalking," crazing, and other surface deterioration frequently seen in outdoor applications. #R-105 Tio2 surface treatment also is optimized for dry flow conveyability and dispersion within plastics