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Capillary Viscometer Bath
+ infoDynamic viscosity measurement for laboratory and industrial applications
Dynamic viscosity measurement is essential for evaluating how liquids and semi-solid materials resist flow under applied force. Accurate viscosity data supports product development, quality control and process optimisation across a wide range of industries.
Fungilab provides complete dynamic viscosity measurement solutions based on precision rotational viscometers, temperature control systems and specialized accessories designed to deliver reliable, repeatable and traceable laboratory results.
Whether measuring low-viscosity liquids or highly viscous materials, Fungilab offers instruments adapted to routine laboratory testing as well as demanding research 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.
Precision temperature baths for capillary viscometers
A capillary viscometer bath is an essential part of any kinematic viscosity measurement system. Since viscosity is highly dependent on temperature, maintaining the sample at a constant temperature is critical for obtaining accurate and repeatable test results.
The Fungilab THERMOCAP has been developed specifically for laboratories performing kinematic viscosity measurements with glass capillary viscometers. Its precision temperature control helps laboratories comply with internationally recognised testing standards while improving measurement repeatability.
Designed for laboratory viscosity testing
THERMOCAP precision baths are suitable for use with the most common capillary viscometer designs, including:
- Cannon-Fenske Routine.
- Cannon-Fenske Opaque.
- BS/U-Tube viscometers for transparent liquids.
- BS/IP/RF U-Tube viscometers for opaque liquids.
- Ubbelohde viscometers.
Why temperature stability matters
Even small temperature variations can significantly affect kinematic viscosity values. A precision temperature bath ensures that every measurement is performed under controlled conditions, improving repeatability, reducing uncertainty and ensuring compliance with ASTM and ISO test methods.
Main advantages
- High temperature stability for viscosity testing.
- Excellent measurement repeatability.
- Suitable for multiple capillary viscometer types.
- Designed for laboratory quality control and research.
- Supports internationally recognised viscosity testing standards.
Complete kinematic viscosity solution
In addition to THERMOCAP precision baths, Fungilab supplies a complete range of glass capillary viscometers and laboratory accessories for kinematic viscosity measurement.
For instrument verification and calibration checks, laboratories can also use certified viscosity standard oils, providing confidence in measurement performance and long-term traceability.
Applications
Capillary viscometer baths are widely used in petroleum laboratories, lubricant manufacturers, chemical industries, research centres and quality control laboratories where precise kinematic viscosity measurements are required.
Frequently asked questions about the Viscolead ADV
What is a capillary viscometer bath?
A capillary viscometer bath is a precision temperature-controlled bath used to maintain constant sample temperature during kinematic viscosity measurements with glass capillary viscometers.
Why is a temperature bath necessary for viscosity testing?
Kinematic viscosity is highly temperature-dependent. A precision bath ensures stable measuring conditions, improving accuracy, repeatability and compliance with testing standards.
Which capillary viscometers are compatible with THERMOCAP?
THERMOCAP is suitable for Cannon-Fenske Routine, Cannon-Fenske Opaque, BS/U-Tube, BS/IP/RF U-Tube and Ubbelohde glass capillary viscometers.
Which industries use capillary viscometer baths?
They are commonly used in petroleum, lubricant, chemical, pharmaceutical and research laboratories where precise kinematic viscosity measurements are required.
Can one bath be used with different capillary viscometers?
Yes. Precision viscosity baths are designed to accommodate multiple types of glass capillary viscometers, depending on the holder configuration.
Does temperature affect kinematic viscosity?
Yes. Even small temperature changes can alter viscosity values, making precise temperature control essential for obtaining reliable laboratory results.
Can THERMOCAP be used for ASTM viscosity testing?
Yes. THERMOCAP is designed to provide the temperature stability required for kinematic viscosity measurements performed according to internationally recognised ASTM and ISO methods.
How can the accuracy of capillary viscosity measurements be verified?
Measurement performance can be verified using certified viscosity standard oils together with properly calibrated glass capillary viscometers and a precision temperature bath.
