Physical Analysis

Particle Size Distribution

Particle Size DistributionMany industries are interested in knowing the size and distribution of particles that comprise materials because they affect such things as materials strength, reactivity, stability and flowability. Typical applications include the analysis of pharmaceuticals, cosmetics, paints, food products, metal powders, ceramics, and polymers.

MRA’s Particle Size Analyzer uses laser diffraction technology to determine particle size distribution on a wet basis. The analytical testing range is 0.1 to 700 microns on a volume basis. Samples can be analyzed as organic or inorganic suspensions. Very detailed reports provide information that includes statistics, percentiles, channel data information, and general setup procedures. The particle information is presented as size distribution graphs, which provide valuable feedback in a variety of properties.


Our laser particle size analyzer is capable to measure the particle size distribution of dry powders and suspensions in a wide range from 0.1 microns to 700 microns.


Powder Surface Area

Powder Surface AreaSurface area is an important control parameter for the processing of ceramic bodies. Since chemical additives in ceramic suspensions and bodies interact with particle surfaces, control  of surface area is a major contributor to the consistency of daily body properties. Relative to their masses, the finest particles contribute the greatest surface areas. When body surface areas vary widely from batch to batch, coverage densities and efficiencies of additives vary equally widely, and consistency of daily body processing will be difficult to achieve.

MRA’s Surface Area Analyzer uses BET technique to measure surface areas of powder samples. The specific surface area of a powder is determined by physical adsorption of a nitrogen gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface.


Our surface area analyzer is capable to measure the surface area or powders and small granules with high precision and reproducibility of the results.


Powder Density

Powder DensityAs a fundamental property of all materials, density can be used to help identify materials as well as to determine the purity of materials. Due to the presence of closed pores in solid materials, large chunks tend to be less dense than finally ground powders of the same material. The true density of a powder is the mass per unit volume of material without any included pores. For this reason, most true density measurements are made on finely milled powders.

MRA employs a helium gas pycnometry to measure the true density of materials with very high precision and reproducibility of the results. Samples measured using this technique can be powders, porous materials, or objects with volumes of 0.1mL to 100mL.


Our powder density analyzer is capable to measure the true density of a variety of the materials with high precision and reproducibility of the results.


Viscosity and Rheology

Viscosity and RheologyViscometers measure viscosities of fluids and suspensions. When viscosities are measured at a variety of shear rates, viscometers can also estimate rheological properties. Viscous and rheological properties are routinely measured for daily process control purposes, as well as for research and development activities.

MRA utilizes “infinite sea” rotational viscometer to measure the forces on rotating spindles while they are immersed in containers of suspension. The container holds an infinite sea of suspension and the wall of the container is usually a great distance from the surface of the rotating spindle. The viscosity measurements are performed at variable shear rates to estimate the rheological properties in addition to the sample’s viscosity.


Our viscometer analyzer is capable to measure viscosity and rheology properties of the suspensions in a wide range of the viscosity values up to 10McP.