ISO 13320-2020 pdf free.Particle size analysis – Laser diffraction methods.
This document provides guidance on instrument qualification and size distribution measurement of particles in many two-phase systems (e.g. powders, sprays, aerosols, suspensions, emulsions and gas bubbles in liquids) through the analysis of their light-scattering properties. It does not address the specific requirements of particle size measurement of specific materials.
This document is applicable to particle sizes ranging from approximately 0,1 pm to 3 mm. With special instrumentation and conditions, the applicable size range can be extended above 3 mm and below 0,1 pm.
For spherical and non-spherical particles, a size distribution is reported, where the predicted scattering pattern for the volumetric sum of spherical particles matches the measured scattering pattern. This is because the technique assumes a spherical particle shape in its optical model. For non-spherical particles the resulting particle size distribution is different from that obtained by methods based on other physical principles (e.g. sedimentation, sieving).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 9276-1, Representation of results of particle size analysis — Part 1: Graphical representation
Iso 9276-2, Representation of results of particle size analysis — Part 2: Calculation of average particle
sizes/diameters and moments from particle size distributions
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
3.1.1 absorption
reduction of intensity of a light beam not due to scattering
3.1.2 accuracy
closeness of agreement between a test result or measurement result and the true value.ISO 13320 pdf download.