Uniform polystyrene microspheres are widely used in various scientific and industrial applications due to their consistent size and spherical shape. They serve as essential tools in calibration standards for particle size analyzers and flow cytometers, ensuring accurate measurements in research and quality control processes. In biomedical research, these microspheres are employed as carriers for drug delivery systems, enabling targeted and controlled release of therapeutic agents. They are also utilized in diagnostic assays, where they act as solid supports for antigen-antibody binding, enhancing the sensitivity and specificity of tests. Additionally, uniform polystyrene microspheres are used in chromatography as stationary phases, improving separation efficiency in analytical techniques. Their optical properties make them suitable for use in light scattering studies and as model systems in colloid and polymer research. In material science, they are incorporated into coatings and composites to modify surface properties and enhance performance.