Used primarily as a fluorescent whitening agent in polymers and coatings, this compound enhances the visual brightness and clarity of plastic materials under UV light. It is especially effective in polystyrene and polyvinyl chloride (PVC) formulations, where it counteracts yellowing and improves aesthetic appeal. Due to its extended aromatic structure and chlorine substitution, it offers good thermal stability and compatibility with hydrophobic matrices. It is also explored in specialty optical materials for its ability to absorb UV radiation and re-emit in the blue region, making it useful in sensor technologies and luminescent tags.