
Dr. Tatsushi Matsuyama
- Chairperson of ISO/TC24/SC4
- Faculty of Engineering, Soka University
Presentation:
Introduction of ISO/TC24/SC4 “Particle Characterization”
ISO/TC24, “Particle characterization including sieving,” was established in 1947 and is one of the younger Technical Committees among the 349 existing today. TC24 began with the international standardization of “sieves,” where “test sieving” remains a major method for characterizing particle size distribution (PSD). Later, methods of instrumental analysis for measuring PSDs were developed, leading to the establishment of SC4 “Particle Characterization” in 1981. In 2008, SC8 “Test sieves, sieving, and industrial screens” was restructured. Currently, TC24 has only two sub-committees: SC8, which focuses on sieves, and SC4, which covers instrumental analyses. SC4 has 17 participating countries, 16 observing countries, 57 published standards, and 11 standards under development, including new ones and revisions. Thirteen active working groups cover all the aspects of measurement principles:
WG1: Representation of analysis data
WG2: Sedimentation, classification
WG3: Pore size distribution, porosity
WG5: Liquid displacement methods
WG6: Laser diffraction methods
WG7: Dynamic light scattering
WG8: Image analysis methods
WG9: Single particle light interaction methods
WG10: Small angle X-ray scattering method
WG11: Sample preparation and reference materials
WG12: Electrical mobility and number concentration analysis for aerosol particles
WG16: Characterization of particle dispersion in liquids
WG17: Methods for zeta potential determination
Recently, the scope of SC4 was updated to include not only PSD analysis but also broader “particle and particle systems characterizations.” TG1, a task group, has been created to study the feasibility of standardizing “powder mechanics.” Additional topics can be discussed for future standardization under the expanded scope. Input is welcomed, and the development of new measurement principles is expected.
It is important to note that these standardizations aim to establish standards for methodologies and technical requirements in practical measurements and the presentation of results. The standards are intended for “users” and not exclusively for equipment or manufacturers. Both users and manufacturers are key stakeholders. Feedback and input from users are encouraged, and cooperation is always welcome. Current members involved in standardization activities can easily be found around you. Your contributions are always welcomed and appreciated.