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  6. Viscometer and rheometer: What is the difference?

Viscometer and rheometer: What is the difference?

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Discovery Core Rheometer

last updated:Jul 10, 2025

TA Instruments Japan  (TAInstruments)
TA Instruments Japan (TAInstruments)
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A rheometer can show changes in viscosity under various conditions rather than a single viscosity.

The Discovery Core Rheometer is the first system to provide extensive measurements of viscosity and viscoelasticity with simple operability. New feature: The RheoGuide user interface allows operation from a touchscreen, providing guidance, visualization, and verification at each step. 【Discover Insights Beyond Viscosity】 Viscometers only report a single viscosity value within a limited range, while the Core Rheometer captures a complete viscosity profile, representing material behavior under all relevant conditions. Complex fluids such as suspensions, emulsions, gels, pastes, and slurries are non-Newtonian fluids, and their viscosity changes depending on the applied shear rate and time. Characterizing the full range of viscosity is crucial for understanding flow behavior under real-world conditions. Related link: https://www.tainstruments.com/viscometer-vs-rheometer-discover-why-a-rheometer-offers-more-than-just-viscosity-measurement/

    Analytical Equipment and Devices
DCR

Viscometer and rheometer: What is the difference?

DCR (1).png
DCR (1).png DCR (1).png DCR (2).png DCR (3).png DCR (6).png DCR (7).png DCR (4).png DCR (5).png DCR (8).png
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basic information

Features: User-friendly interface: The new RheoGuide user interface makes operation easy with a touchscreen, displaying instructions and diagrams at each step. High-precision measurements: Precision air bearings and optical encoders enhance torque sensitivity, allowing for measurements of low viscosity and low shear rates. Versatility: Detailed evaluation of the viscosity properties of non-Newtonian fluids such as suspensions, emulsions, gels, pastes, and slurries. Rapid temperature control: The Peltier system enables accurate and quick temperature control, ensuring data reproducibility. Advantages: Ease of operation: Touchscreen operation allows even beginners to use it easily, achieving an efficient workflow. High accuracy and reproducibility: Precise torque sensitivity and temperature control provide reliable data. Cost reduction: The built-in air cooling system eliminates the need for a liquid circulation system, reducing operational costs. Compatibility with diverse materials: Capable of evaluating the viscoelastic properties of a wide range of materials, suitable for applications from research and development to quality control.

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Applications/Examples of results

Applications: Polymer Research: Evaluates the viscoelastic properties of polymers, aiding in the development of new materials and quality control. Food Industry: Measures the flow properties of food products such as sauces, creams, and gels to optimize texture and stability. Cosmetics: Measures the viscosity of creams and lotions to assess usability and stability. Pharmaceuticals: Measures the viscosity of gels and creams to optimize formulation properties. Paints and Coatings: Evaluates the flow properties of paints and coatings to optimize application and drying characteristics. Examples of Achievements: Polymer Research: Rowan University is advancing research on new polymer materials using TA Instruments technology. Energy-related Research: The Amanchukwu group at the University of Chicago is utilizing TA Instruments technology to design and synthesize new electrolyte media for batteries and electrode catalysts. Quality Control: Many companies are using DCR to enhance product quality control and optimize manufacturing processes. Food Industry: Food manufacturers are using DCR to evaluate product texture and stability, improving consumer satisfaction.

Detailed information

  • DCR_app.png

    Figure 1: A schematic diagram showing the range of shear rates at which the process occurs. All of these can be modeled using a rheometer. A narrow range of shear rates accessible with a viscometer is indicated.

  • DCR_app2.png

    Figure 2: Virtual data of a face cream showing how viscosity is affected by shear rate. The rheometer should be able to identify all the displayed actions, while the viscometer will only show the highlighted central portion.

  • DCR_app4.png

    We investigated the reasons why one formulation of liquid emulsion adhesive designed for high-speed coating, using a TA Instruments rheometer, significantly underperformed compared to competitors. This performance deficiency led to the occurrence of voids on metal substrates and an increase in cases of adhesion failure (Figure 3a). Figure 3: (a) A schematic showing the differences in operation between Formulation 1 and the competing product.

  • DCR_app5.png

    The viscometer showed the differences in viscosity between samples, but there was no data for either high shear rate or low shear rate. It was only when using the rheometer that it became clear that the zero shear viscosity of the competing product was eight times higher. This was the key. A high zero shear viscosity means that the competing product does not flow after application and stays in place. Figure 3: (b) Shear rate and viscosity data for the competing product, formulation 1, and formulation 2.

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TA Instruments Japan (TAInstruments)

Testing, Analysis and Measurement

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TA Instruments Japan is a wholly-owned subsidiary of TA Instruments in Japan. We sell and provide maintenance support for thermal analysis, rheology, microcalorimeters, and mechanical analysis equipment, conduct demonstration measurements, and hold technical seminars, offering the latest information on materials and engaging in the development of measurement technologies for materials. 【Main Equipment Handled】 ☆ Thermal Analysis / Differential Scanning Calorimeter (DSC), Thermogravimetric Analyzer (TGA), Simultaneous Differential Thermal Analysis (SDT/TG-DTA), Vapor Adsorption/Desorption Analyzer (Q5000SA) ☆ Viscoelastic Measurement (Rheology) / Rotational Rheometer (DHR・ARES), Dynamic Mechanical Analyzer (RSA・DMA・EF3200), Rubber Testing Cure Meter (RPA) ☆ Microcalorimetry / Isothermal Titration Calorimeter (ITC), Microcalorimeter (NanoDSC), Isothermal Calorimeter (TAM) ☆ Thermal Property Measurement Equipment / Thermal Conductivity Meter (DTC・FOX), Thermal Diffusivity Meter (DLF, DXF), Thermal Expansion Meter (TMA, DIL), Optical Thermal Expansion Meter (ODP, HM) ☆ Fatigue Testing Machines / ElectroForce Series, BioDynamic Series

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