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Rheology Testing Services

1 Order Completed
Chapel Hill, North Carolina, US

About Rheology Testing Services

We offer an array of rheological tests that may help answer the questions, to drive the project, to meet the business need ranging from basic comparative screening to comprehensive characterization using a state of the art Malvern Kinexus Pro rheometer. We perform a broad range of analyses on solutions, suspensions, mixtures, oils, and semisolids covering food, cosmetic, pharmaceutical, and other industries to quickly and quantitatively model real life applications under highly defined and controlled conditions. Outputs from these tests may provide better insight into product manufacturing, handling, performance, efficacy, and sensory attributes.

More detailed information can be found at www.rheologytestingservices.com

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Our Services (3)


Rheology Analysis

Price on request

Below are summaries of the core tests offered. We can certainly perform other analyses to meet your needs. More detailed descriptions for each core test are found in other sections in this website. More detailed information can be found at www.rheologytestingservices.com.


•Yield Stress and Yield Viscosity (flow curves) measure the breaking point of the macro structure across a range of stress to model properties like spreadability and pumpability. It can be a useful tool to screen formulation properties.

•Thixotropy, a 3 step test, models product rebuild after shear thinning that often occurs during manufacturing, dispensing and application. For example, toothpaste is rheologically designed to remain in an open tube until sufficient stress is applied (flow), after which it quickly rebuilds to remain intact on the toothbrush. Paint and ketchup are also classic examples of thixotropic materials.


•Amplitude Sweep determines the LVER (Linear ViscoElastic Region) that tends to correlate with physical stability and is also a critical input parameter for other oscillation tests.

•Frequency Sweep generates a "rheological fingerprint” and also determines viscoelastic properties such as stiffness (complex modulus) and complex viscosity across a frequency range (1/time). Silly Putty rolled into a ball is an excellent example of the effect of frequency on material properties. At rest (slow event=very low frequency), it slowly flows as a viscoelastic liquid (G">G'), yet when dropped on a surface (fast event=high frequency) it bounces as a viscoelastic solid (G'>G").

•Temperature Sweep models properties over a temperature range. Is your product reversibly or irreversibly rheologically changed after storage in a hot or cold car? Is your product sensitive to temperature changes during manufacturing that affect product efficacy and quality?


•Pull-Away test quantitates the stickiness of a product, an important sensory consideration for consumer satisfaction and compliance.

It should be noted that several studies can be coupled in many interesting and informative ways. For example, a follow-up frequency sweep could be performed after LVER is determined, following a yield stress, thixotropy study, or temperature sweep to compare the changes in viscous (G'), elastic (G"), and complex (G*) modulii, along with complex viscosity and phase angle due to exposure to various controlled shear rates and/or temperatures.

Malvern Kinexus Pro Rheology Rheometry flow curve shear modulus shear rate shear strain shear stress Viscometry Viscosity yield stress yield viscosity oscillation rotational tackiness stickiness thickness R&D formulation development topical manufacturing process simulation in-process process thixotropy complex modulus complex viscosity elastic modulus viscous modulus Show 29 more tags Show less


Material Testing Services

Price on request

Material Characterization Services

Malvern Kinexus Pro complex modulus complex viscosity elastic modulus flow curve formulation development in-process manufacturing oscillation process process simulation R&D Rheology Rheometry rotational shear modulus shear rate shear strain shear stress stickiness tackiness thickness thixotropy topical Viscometry Viscosity viscous modulus yield stress yield viscosity Show 29 more tags Show less


Analytical Chemistry Services

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Analytical Chemistry Services

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Mark Patrick


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  • JM

    John MillerSeptember 2018

    I have known the owner - Mark Patrick - for many years and I recommend Rheology Testing Services very highly. He has an impressive expert understanding of the science of rheology. I worked with Mark for many years during our time with GlaxoSmithKline and saw first-hand the exceptional quality of his work. He conducts his work with great rigor and professionalism.

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