The use of this standard requires practical experience in regular laboratory work, attention to laser radiation may cause permanent damage to the eyes, avoid direct laser beam of light or reflected light, and comply with local laser radiation safety regulations. The standard specifies a method for the determination of Particle size distribution by analyzing the light scattering characteristics of olefin coalescence catalyst particles. Particle size distribution is applicable to the determination of titanium mg olefin coalescence catalyst particles. The results are affected by the particle shape and may differ from those of the Miscellaneous Physics Principle Method. The standard cites the necessary documents, including Measuring method Precision, Particle size distribution laser diffraction method, etc.