BS EN ISO 7368:2021, also known as "Determination of dynamic viscosity using rotational viscometers - Cone/plate viscometer operated at a high rate of shear," is an international standard that specifies the method for measuring the dynamic viscosity of liquids using rotational viscometers with cone/plate geometry under high shear rates.
Importance of Dynamic Viscosity Measurement
Dynamic viscosity is a fundamental rheological property of fluids that describes their resistance to flow under the influence of an applied force or shear. It plays a crucial role in various industrial processes, such as the manufacturing of paints, coatings, adhesives, and polymers. Accurate measurement of dynamic viscosity helps ensure product quality, optimize process conditions, and meet regulatory requirements.
Measurement Procedure
The measurement procedure outlined in BS EN ISO 7368:2021 involves the use of a cone/plate rotational viscometer. This type of viscometer consists of a flat circular plate (the cone) and a stationary circular plate with the same diameter (the plate). The liquid sample is placed between the two plates, and the cone rotates while the plate remains fixed. As the cone rotates, it generates a shearing force on the liquid sample, causing it to flow.
The viscometer measures the torque required to rotate the cone at a constant speed and calculates the dynamic viscosity based on the known dimensions of the plates and the measured torque. The high rate of shear employed in this method ensures accurate measurement of dynamic viscosity even for fluids with non-Newtonian behavior, i.e., those whose viscosity changes with the shear rate.
Benefits of BS EN ISO 7368:2021
BS EN ISO 7368:2021 provides several benefits for manufacturers, researchers, and regulatory bodies:
Accuracy: The standard ensures accurate measurement of dynamic viscosity under high shear rates, resulting in reliable data for product development and quality control.
Reproducibility: The standardized measurement procedure allows for consistent results across different laboratories and instruments.
Compatibility: The method described in the standard can be applied to a wide range of liquids, including Newtonian and non-Newtonian fluids.
Regulatory Compliance: Adhering to this international standard helps companies meet regulatory requirements and industry guidelines.
In conclusion, BS EN ISO 7368:2021 provides a robust and standardized method for measuring the dynamic viscosity of liquids using cone/plate rotational viscometers. This standard plays a crucial role in ensuring product quality, optimizing industrial processes, and meeting regulatory requirements. By following the guidelines outlined in this standard, manufacturers can obtain accurate and reproducible viscosity data, leading to improved product performance and customer satisfaction.
Nina She