In practice, after processing SBS in a GlobeCore colloid mill, the typical particle size in PMB is in the range of 1-10 microns, depending on gap setting, shear rate, and polymer grade. This size is small enough to ensure uniform dispersion and fast swelling in bitumen. Finer grinding mainly improves curing speed and storage stability, while going much below a few microns brings little additional benefit for PMB performance.