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Rotational viscometers
+ infoRotational viscometers for accurate viscosity measurement
Rotational viscometers are among the most widely used laboratory instruments for measuring the dynamic viscosity of liquids, semi-solids and non-Newtonian materials. They provide reliable, repeatable and accurate measurements across a broad viscosity range.
Using spindle rotation and torque measurement, rotational viscometers help laboratories evaluate product consistency, optimise formulations and maintain quality control throughout the manufacturing process.
Fungilab manufactures a complete range of professional rotational viscometers together with specialized accessories and temperature control systems for demanding laboratory applications.
Our products
Viscolead Series
Viscolead ONE
Viscolead ADV
Accessories
LABORATORY DIVISION
Dynamic viscosity
Viscosity is part of the science of Rheology which quantifies the resistance materials give to changing shape.
Proper interpretation of viscosity data can reduce the rate of rejects while keeping production and formulation development costs to a minimum. Consistent product quality is ensured through proper viscosity measurements, either alone or in conjunction with compatible tests.
Dynamic viscosity testing can help with:
- Material characterization or “finger-printing”
- Standard testing methods to check for differences between batches
- Indirect way of measuring quality
- Product formulation
- Quality control
- Process control
- Design, optimization and operation of process equipment
Material characterization or “finger-printing”
Standard testing methods to check for differences between batches
Indirect way of measuring quality
Product formulation
Quality control
Process control
Design, optimization and operation of process equipment
Viscosity types
Dynamic viscosity
Centipoise (mPa*s)
Kinematic viscosity
Centistokes (mm2/sec)
Apparent viscosity
Centipoise (mPa*s)
Newton’s Law
According to Newton’s law, the viscosity of a fluid is constant. As shear rate changes, shear stress changes in proportion such that viscosity is constant. Common fluids that exhibit such behavior are:
Unfortunately for us, not all fluids follow Newton’s law. In fact, most fluids do not. For this reason, fluids are classified into two categories:
Rotational Viscometer
The viscosity is calculated from the measured torque and rotational speed, as well as the dimensions of the measuring geometry.
A fluid’s resistance to flow is measured by the torque it exerts on the rotating shaft of the viscometer.
Absolute viscosity: the measuring geometry fulfills certain requirements (which is the case of coaxial spindles).
Relative viscosity: the dimensions of the measuring geometry are not well defined.
Advantage
Flexibility in:
- Viscosity Range
- Temperature range
- Shear rate range
Application
For Newtonian and non-Newtonian substances and temperatures different from room temperature.
Professional rotational viscometers for laboratory and industrial applications
Rotational viscometers determine dynamic viscosity by measuring the torque required to rotate a spindle immersed in the sample. This measurement principle makes them suitable for analysing both Newtonian and non-Newtonian fluids over a wide viscosity range.
Their versatility has made rotational viscometers the preferred choice for quality control laboratories, research centres and industrial production facilities across numerous sectors.
Fungilab rotational viscometer range
Fungilab offers professional solutions for virtually every viscosity measurement requirement, including:
- Viscolead Series for intuitive routine viscosity measurements.
- V-Series for advanced laboratory applications requiring enhanced functionality and connectivity.
Specialized accessories
To adapt the instrument to different sample types and testing conditions, Fungilab provides several dedicated accessories.
- Low Viscosity Adapter (LCP) for low-viscosity liquids.
- Small Sample Adapter (APM) for reduced sample volumes.
- HELDAL Unit for highly viscous materials.
- Thermosphere for viscosity measurements at temperatures up to 300°C.
Temperature-controlled viscosity measurements
Because viscosity varies with temperature, accurate testing requires stable thermal conditions. Fungilab offers heating circulators and refrigerated circulators that maintain precise sample temperatures throughout the measurement process.
Industries and applications
- Pharmaceutical products.
- Cosmetics and personal care.
- Food and beverages.
- Paints and coatings.
- Adhesives and sealants.
- Chemical products.
- Petroleum and lubricants.
- Research and development laboratories.
Instrument verification
Routine verification using certified viscosity standard oils ensures accurate, repeatable and traceable viscosity measurements while supporting laboratory quality management procedures.
Why choose rotational viscometers?
Rotational viscometers provide exceptional flexibility, allowing laboratories to measure a wide variety of sample types while supporting multiple spindle configurations, temperature-controlled testing and specialized accessories. Their ability to analyse both Newtonian and non-Newtonian materials makes them one of the most versatile viscosity measurement solutions available.
Frequently asked questions about the Viscolead ADV
What is a rotational viscometer?
A rotational viscometer measures dynamic viscosity by determining the torque required to rotate a spindle immersed in a liquid or semi-solid sample.
Which materials can be measured with a rotational viscometer?
They are suitable for liquids, creams, gels, paints, coatings, adhesives, food products, oils and many other Newtonian and non-Newtonian materials.
What are the advantages of rotational viscometers?
They provide accurate, repeatable measurements across a wide viscosity range and can be adapted to many different sample types using specialized accessories.
Which Fungilab rotational viscometers are available?
Fungilab offers the Viscolead Series and the V-Series for routine quality control, research and advanced laboratory applications.
Why is temperature control important during viscosity measurements?
Since viscosity changes with temperature, precise thermal control is essential for obtaining reliable and repeatable measurement results.
Can rotational viscometers measure non-Newtonian fluids?
Yes. Rotational viscometers are particularly well suited for measuring both Newtonian and non-Newtonian materials.
How can instrument accuracy be verified?
Routine verification using certified viscosity standard oils helps maintain accurate, repeatable and traceable laboratory measurements.
Which industries commonly use rotational viscometers?
They are widely used in pharmaceutical, cosmetic, food, chemical, coating, adhesive, petroleum and research laboratories worldwide.
