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Determination of density

The density is used in different areas of application to characterize material or product properties, like the concentration. The determination of the density is one of the most used applied gravimetric procedures in laboratories. We offer the determination of the density by means of either pyknometers or the oscillation method (vibrometer).


The pycnometer is a volume-calibrated glass flask and is used for the determination of the density by means of weighing. It is a very precise method and is suitable for solids, powders, granulates, liquids and dispersions. Due to our manifold equipments the available temperature range is barely limited.


Schematic draft of a pycnometer


For the determination of the density we use a Kratky-apparatus, which consists mainly of a vibrometer with known volume. The vibrometer will be filled with a liquid and initiated to oscillate. After calibration of the measuring cell with two liquids with known density, the measured resonance frequency can be estimated to the density of the analysed liquid. The temperature range of the measuring device is from -10 up to 80°C.


Schematic draft of the vibrometer

In the table you can find some test methods, which we offer. If you cannot find a desired test method, do not hesitate to address us.

Test methods:

DIN EN ISO 2811/1

Paints and varnishes - Pycnometer method

DIN EN ISO 2811/3

Paints and varnishes - Oscillation method

DIN EN ISO 1183/1

Non-cellular plastics - Pycnometer method

ISO 8130/3

Coating powders - Pycnometer method

ISO 1675

Liquid resins - Pycnometer method

ISO 2781

(Thermoplastic) Elastomers

ISO 845

Cellular rubbers and plastics: Determination of apparent density

Determination of densities under elevated pressures / elevated temperatures

Due to thermal expansion and compressibility of matter the density depends on temperature and pressure. Our equipment consists of a pressure and temperature resistant oscillating U-tube and enables the determination of densities for temperatures up to 140°C and pressures up to 400 bar. By means of the Tait equation the values can normally be reliable extrapolated up to 1,000 bar.

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