Viscosity Testing Lab

Rheometer in action, close up of geometry

We provide a fast-turnaround viscosity testing lab service for your samples.
 
We can perform viscosity measurements at defined temperatures in units of centiPoise (cP or “cps”) or milliPascal seconds (mPa.s). On completion of testing you will receive a full report, including graphics, data tables and explanations.
 
We have a wealth of experience testing a variety of complex materials. We will also provide support for interpretation or application of the results as part of our service offering.

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Viscosity measurements for non-Newtonian liquids

Most samples we receive include soft multi-phase materials. This includes suspensions and emulsions which tend to be non-Newtonian fluids. Non-Newtonian fluids change their viscosity dependent upon the degree of shear applied. For shear-dependent products, it is very useful to measure viscosity across a range of shear conditions. The resulting “flow curve” can help identify which viscosity values are relevant to your product or process.

Controlled Rate Viscosity Profiles

Viscosity/shear rate or shear stress/shear rate profiles, often termed rheograms, are a great way of understanding product behaviour under “forced-flow” conditions such as in pumping, mixing or filling processes. In this test, we apply a range of shear rates to the sample and measure viscosity throughout.

Controlled Stress Viscosity Profiles

Viscosity/shear stress profiles are excellent for simulating altogether more gentle situations, where gravity, surface tension and capillary are the forces acting on the material. This is often the case in processes such as settling of suspensions, creaming of emulsions and draining and levelling of wet coatings.

Zero-shear viscosity measurements

Viscosity testing, a viscosity shear stress sweep clearly showing zero shear viscosity plateaus.
Viscosity profiles across a range of shear rates. We can clearly see the zero-shear viscosity plateaus.

Performing viscosity testing under very low shear conditions also enables the measurement of zero-shear viscosity. Zero-shear viscosity is a plateau value obtained at very low shear. Far below the range typically attainable with a viscometer. A high value of zero-shear viscosity can help to immobilise suspended solids or emulsified liquid droplets, contributing significantly to physical stability.

Viscosity and Temperature

The majority of liquids show a decrease in viscosity with increasing temperature. The degree of dependence can be significant thus, it is critical to measure viscosity, under as close as possible conditions encountered in use, processing or storage.

Brookfield viscosity

The term used to describe a viscosity value obtained with a Brookfield-type viscometer or similar other instrument employing, typically, a rotating spindle that dips into a beaker of the liquid to be tested. Brookfield viscosity can be fearsomely confusing however, with a multitude of instrument types and accessories, many combinations of which, deliver widely varying viscosity measurements. We have a full complement of Brookfield viscometer instruments and accessories and can identify and perform the most appropriate tests for your needs.

Calibration and Traceability

We can supply instrument calibration verification to certified, traceable viscosity standards.

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