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Centrifugal Liquid Sedimentation

Centrifugal liquid sedimentation particle testing standards are published by ISO. This includes the ISO 13318 series on determination of particle size distribution by centrifugal liquid sedimentation methods. This includes topics from general principles, photocentrifuge methods, and centrifugal x-ray methods.

ISO 13318-1:2001

Determination of particle size distribution by centrifugal liquid sedimentation methods -- Part 1: General principles and guidelines

This part of ISO 13318 covers methods for determining the particle size distributions of particulate materials, typically in the size range 0,1 m to 5 m, by centrifugal sedimentation in a liquid. The methods of determining the particle size distribution described in this part of ISO 13318 are applicable to slurries, particulate materials which can be dispersed in liquids and some emulsions. A positive density difference between the discrete and continuous phases is necessary, although centrifugal photosedimentation can be used for emulsions where the droplets are less dense than the liquid in which they are dispersed.

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ISO 13318-2:2007

Determination of particle size distribution by centrifugal liquid sedimentation methods - Part 2: Photocentrifuge method

ISO 13318-2:2007 covers methods for determining the particle size distribution of particulate materials by means of centrifugal sedimentation in a liquid. Solids concentrations are determined by the transmission of a light beam. The resulting signal enables conversion to a particle size distribution. The method of determining the particle size distribution described in ISO 13318-2:2007 is applicable to powders that can be dispersed in liquids, powders that are present in slurry form and some emulsions. Typical particle size range for analysis is from about 0,1 µm to 5 µm. The method is applicable to powders in which all particles have the same density and comparable shapes and do not undergo chemical or physical change in the suspension liquid. It is usually necessary that the particles have a density higher than that of the liquid.

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ISO 13318-3:2004

Determination of particle size distribution by centrifugal liquid sedimentation methods - Part 3: Centrifugal X-ray method

ISO 13318-3:2004 describes a method for determining the particle size distributions of homogeneous particulate material using centrifugal sedimentation in a liquid. Solids concentrations are determined by the attenuation of an X-ray beam. The resulting signal enables conversion to a particle size distribution. The method of determining the particle size distribution described in this standard is applicable to powders which can be dispersed in liquids or powders which are present in slurry form. The typical particle size range for analysis is from 0,1 m to 5 m. The method is applicable to powders in which all particles have the same effective density, chemical composition and comparable shapes. Materials possessing elements with an atomic number greater than about 12 can be expected to produce adequate X-ray opacity. Particles should not undergo chemical or physical change in the suspension liquid. It is necessary that the particles have a higher density than that of the liquid.

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