Grain size measurement

Grain size measurement allows for the characterization of the particle size distribution of a solid material, whether it be metals, ceramics, polymers, industrial powders, or minerals . This analysis provides essential information on the morphology, texture, and internal structure of materials, directly influencing their mechanical, thermal, and rheological properties.

Depending on the nature of the sample and the required precision, grain size can be determined by optical microscopy, scanning electron microscopy (SEM) , or laser diffraction . These methods provide a detailed view of particle distribution and allow for optimization of product formulation, manufacturing processes, or quality control.

Analytical methods

Different techniques are used to measure the size and distribution of grains:

• Scanning electron microscopy (SEM) : allows observation of the surface structure of materials with nanometric resolution and direct and precise measurement of grain size.
• Optical microscopy : used for materials with larger grains (metals, semi-crystalline polymers), it allows us to obtain an estimate of the average size and distribution.
• Laser diffraction : a fast and statistically representative method, suitable for powders and suspended particles (parameters D10, D50, D90).
• Image analysis : digital processing of micrographs to quantify the size, shape and distribution of grains.

These approaches can be combined to provide multi-scale characterization of the material, from the micron to the nanometer.

To learn more, also check out:

• analysis D10/D50/D90 ,
• scanning electron microscopy (SEM ) ,
• or the analysis of powder cohesion to evaluate the mechanical behavior of particles.

Industrial applications

Grain size measurement is a key step in many fields:

• Materials and polymers : control of crystalline structure, evaluation of mechanical and thermal properties, monitoring of sintering or molding processes.
• Packaging : study of the surface and texture of polymer materials to ensure good adhesion and resistance.
• Metallurgy : measurement of grain refinement to determine the hardness and ductility of metallic alloys.
• Technical ceramics and powders : optimization of sintering properties, density and homogeneity of the material.
• Cosmetics and nutraceuticals : control of the particle size of powders, pigments and dry extracts to ensure homogeneous dispersion and a suitable texture.

These analyses make it possible to anticipate the behavior of materials during the transformation and use stages, guaranteeing the stability and performance of the finished products.

Analytical interest and complementarity

Grain size directly influences the physical properties of a material: the finer the grains, the higher the specific surface area, which impacts mechanical strength, dissolution, porosity, and thermal conductivity .
This is why this analysis is often combined with other tests for a complete understanding.

• Porosity analysis to correlate grain size with material density;
• DSC thermal analysis to identify crystalline transitions related to the microstructure;
• Hardness test to measure the influence of grain on mechanical strength;
• FTIR infrared spectroscopy to analyze the chemical composition of the material.

These combinations make it possible to link the microstructural and functional characteristics of the material, promoting targeted optimization of industrial processes.

YesWeLab Services

YesWeLab provides you with a network of partner laboratories accredited to ISO 17025 and/or COFRAC , specializing in microscopy, particle size analysis, and the characterization of solid materials .
Our experts will assist you in defining the method best suited to your matrix (powder, metal, polymer, ceramic) and your objectives (R&D, production, certification).

Thanks to the YesWeLab digital platform , you can centralize your analysis requests, track your samples, and access your results online. Since 2020, YesWeLab has been supporting manufacturers in the materials, packaging, and powder industries with their structural and performance analyses.

For any specific request or quote, contact our scientific team now.