![]() For MBP 1 - 10 sample, PSD by LD method was slightly smaller than that measured by scanning electro microscopy (SEM) or electro sensing zone (ESZ) methods. MBP 1 - 10 sample was well dispersed in water without detergent, but a few drops of detergent sometimes needed for dispersing M BP 10 - 100 sample. PSD results measured by LD instruments were almost same as each other for both RP samples. This paper shows why LD method needs to check its performance by using RP, and then reports the results of the round robin test of two kinds of RP (MBP 1 - 10 and MBP 10 - 100) and silica RP candidate with 0.1 - 1.0 mu m size measured by LD instruments, which was conducted by the Technical Group of Measurement and Control in APPIE. For this purpose, the Association of Powder Process Industry and Engineering, Japan (APPLE) distribute the spherical barium titanate glass particles as RP of JIS Z 8900-1, whose size ranges are 1 - 10 mu m (MBP 1 - 10), 3 - 30 mu m (MBP 3 - 30) and 10 - 100 mu m (MBP 10 - 100). ![]() ![]() From this fact, the validation of PSA by LD method should be done using reference particles (RP), whose size distribution is better to have a range over one decade of size, according to ISO 13320-1. However particle size distribution (PSD) measured by LD method depends a great deal on not only optical detector configuration and calculation procedure but also on the system of sample loading into the measuring zone. The particle size analysis (PSA) by laser diffraction (LD) method can be used for monitor or control of particulate process, because it has the advantages of shorter measurement time and good repeatability, and a variety of commercial instruments is available.
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