The PP455/530 series products are the latest generation of fluorescent particles dedicated to PIV. Compared with traditional fluorescent particles, on the one hand, its wavelength is suitable for RapidPulse series lasers, and on the other hand, its density is 1.00g/cc, which perfectly matches the density of water and can ensure long-term suspension in water without settling. Generally speaking, 1.03g/cc PSP particles can ensure about 4 hours of suspension time, while 1.15g/cc traditional fluorescent particles can only be suspended for about 20 minutes. Therefore, the FPP455/530 series products can greatly improve the measurement accuracy of PIV and are suitable for a wider range of applications.