Viscosity Testing Lab

Rheometer in action, close up of geometry

We are an expert viscosity testing lab providing a fast-turnaround viscosity characterisation service for liquids and semi-solids.

Our lab can perform viscosity measurements at defined temperatures in units of centiPoise (cP or “cps”) or milliPascal seconds (mPa.s) across a range of shear conditions. On completion of testing you will receive a full report, including graphics, data tables and explanations. Whether you have a limited sample run, insufficient time to perform testing, or simply lack of equipment/expertise, we can help.

We have a wealth of experience testing a variety of complex materials. Every report includes ongoing Q&A support for interpretation or application of the results as part of our service offering.

Send A Sample For Characterisation of Viscosity

Send a sample

Viscosity Testing of non-Newtonian liquids

A viscosity flow curve comparing Newtonian and non-Newtonian behaviour Most samples we receive include soft multi-phase materials, typically including suspensions, gels or 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. We provide a fully detailed results presentation with an explanation of the equipment, methods and techniques used. We are happy to host a discussion of what the results mean in the context of your application of interest and can also provide viscosity training and consulting services. Whether you are interested in the viscosity of your material for quality control, scale-up, research or stability assessments, we can work with you to identify an appropriate method as well as high quality data.

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 temperature dependence can be significant thus, it is critical to measure viscosity, under as close as possible conditions encountered in use, processing or storage. Our viscosity testing is performed under rigorous temperature controlled regimes. Our high sophisticated testing equipment enables us to study viscosity as a function of static or dynamic temperature conditions.

Brookfield Viscosity Testing

The term used to describe a viscosity value obtained with a Brookfield-type viscometer, rotational viscometer or similar-acting benchtop viscometers. These machines employ, typically, a rotating spindle that dips into a beaker of the liquid to be tested. Brookfield viscosity can be fearsomely confusing due to a multitude of instrument types and accessories, many combinations of which can deliver widely varying viscosity measurements. Our laboratory 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.

Contact us now to receive a quotation

Contact Us