Applications Lubricants, oils and fuels

Absolute viscosities and interfacial properties – precisely measured according to international standards


The change in viscosity due to temperature fluctuations is of importance in those places where oils and liquids are produced, pumped, and moved. The minimization of friction losses due to the selection of suitable oils is essential when it comes to the design of machines and pneumatics. As mentioned before, capillary viscometry is the most precise and strictly standardized method to measure absolute viscosities. Measuring routines need to be executed efficiently, quickly, with absolute safety, and reproducibly at any time. With the modular concept of LAUDA Scientific, system configurations can be put together which combine the functionalities required for the respective purpose.

Important indicators of oil quality, for example, to check the deterioration of transformer oils, are also the surface tension (ST) to air, but particularly the interfacial tension (IT) to water or aqueous solutions. The surface/interfacial tension also serves to characterize additives for fuels and lubricants or to analyze tertiary crude oil production and all sorts of surfactants, e.g. emulsifiers, wetting agents, etc. Alongside the conventional lamellae tension methods of Du Noüy and Wilhelmy, LAUDA Scientific provides the drop volume and bubble pressure methods with which adsorption processes of amphiphilic additives or aging products can also dissolve over time on interfaces.

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Lubricants and fuels

Viscosity index and kinematic viscosities of SAE/ISO motor oils

Insulating oils

Kinematic viscosity and interfacial tension of transformer oils


Recovery rate in tertiary oil production with surface active substances

Oil transport

Pumpability of crude oils (record of viscosity temperature characteristics)

Waxes, resins, silicone and polyols

Absolute, kinematic, and dynamic viscosities of highly viscous liquids

LAUDA Scientific Viscometer systems – Advantages and benefits at a glance



ASTM D445 DIN 51562

Intuitive measuring principle

Unrivalled precision

Constant calibration not dependent on temperature

Up to eight parallel measurement positions


Easy, affordable execution with stopwatch

Better than 0.3 per cent guaranteed

Only one capillary constant from -40 up to 200 °C

Acceleration of the process

International comparability independent of the measuring device

Calculation of the viscosity index according to ASTM D 2270/ISO 2909

Automatic control of the temperature

Extreme measurement range from -60 up to 200 °C

Comparison of the specifications with current figures from the quality check

Work-free periods can be used for long-term measurements

Complete viscosity scan possible at all application temperatures

LAUDA Scientific Tensiometer systems – Advantages and benefits at a glance



Sensitive to amphilic molecules

Standardized sensors

Ring method TD, interfacial tensions

Drop volume method

Computer software running Windows

Low concentration of impurities, additives and aging products detectable

International comparability

Provide values in thermodynamic equilibrium

Provides additional information on adsorption on interfaces

Flexible experiment running, also for research tasks

Intuitive operation, high degree of flexibility