Density Measurements


Density Lab Services

Quantachrome Instrument’s contract lab, LabQMC, offers analytical services for measurement of true or skeletal density by gas expansion pycnometry. True (skeletal) density is determined by automatic gas expansion pycnometer so there are no solubility issues as might be encountered with liquid pycnometers. True (skeletal) density measurements are typically performed using helium or nitrogen gases, but argon, carbon dioxide, and sulfur hexafluoride can also be used. The correct selection is made according to sample type (mineral, vegetable, etc).



Porosity Lab Services

For a regular shaped material of known dimensions, calculation of porosity follows directly from the density measurement. For powders and irregular shaped materials, density measurements can be coupled with our gas adsorption or mercury porosimetry analytical services in order to determine porosity of your sample. Our laboratory personnel are happy to provide advice or discuss your application in order to determine the correct testing methods to obtain the desired information about your material.





Polymer Foam Lab Services

Gas pycnometry is also used for open/closed cell determination of polymer foams and cellular plastics. Analytical services for corrected or uncorrected measurements are possible. The customer should provide a 1 inch (2.54 cm) cube sample for analysis. Additionally, foam compressibility measurements using nitrogen pycnometry can be performed over the approximate pressure range from 2-20 psig.





Tapped Density Lab Services

LabQMC also offers analytical services for measurement of tap density. Tapped density, a space-filling property of bulk powders, is reported not as a single value, but as the trend according to a number of taps. Hausner Ratio and Carr’s Index, both indicators of flow and compressibility properties, are reported at no additional charge. Dry powder pycnometry measurements can also be performed to determine geometric (envelope) volume/density of irregular shaped pellets or granules.

Density measurements are often used in the following industries:



  • Polymer and Cellular Foam
  • Packaging
  • Battery
  • Oil and Gas
  • Soil and Geological
  • Medical and Dental
  • Metal Powders, Oxides, and Alloys
  • Environmental
  • Rubbers
  • Plastics
  • Ceramics
  • Pharmaceutical
  • And many more


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