Used primarily in the production of photographic film and motion picture film due to its excellent clarity, dimensional stability, and resistance to tearing. It serves as a film base in traditional analog photography and was widely adopted before the rise of digital imaging. Also employed in the manufacturing of LCD screens as a polarizing film component, where it helps control light transmission. Used in some types of reverse osmosis membranes for water purification because of its ability to form thin, selective layers that allow water molecules to pass while blocking contaminants. Additionally, finds use in pharmaceutical coatings for controlled-release drug formulations, where it acts as a semi-permeable barrier. Its biocompatibility and film-forming properties make it suitable for certain medical devices and dialysis membranes.