Polymer Viscosity Measurement: Key Changes in EN ISO 1628-1:2024
The EN ISO 1628-1:2024 standard officially introduces a second method for determining the viscosity of polymers in dilute solution: the differential pressure method. This complements the traditional Method A (flow time method), expanding the options available to laboratories and industries seeking efficiency and automation.
What is the Differential Pressure Method?
The differential pressure method (Method B of the EN ISO 1628-1:2024 standard) measures viscosity by comparing the differential pressure generated by the simultaneous flow of a polymer solution and its pure solvent through capillary tubes. This approach enables continuous and automated measurement, making it ideal for industrial environments that demand high productivity and real-time quality control.
AIMPLAS has enhanced its viscosity measurement capabilities by acquiring a new viscometer capable of measuring differential pressure in each capillary.
Advantages of Method B
According to the standard, both methods provide equivalent results in terms of intrinsic viscosity and K-value. However, the differential pressure method offers key advantages:
- Simplified automation: Facilitates integration into automated systems, reducing manual intervention.
- Increased safety: Minimizes operator exposure to solvents and reduces sample handling.
- Lower solvent consumption: Requires less capillary cleaning, optimizing resource usage.
What Are the Applications of These Measurements?
Intrinsic viscosity is closely related to the mechanical, thermal, and processability properties of polymers. It is used in:
- Evaluation of resins such as PET, PVC, polyacrylonitrile, polyamides, among others.
- Quality control in plastic production lines.
- Comparison of raw material batches.
- Determination of thermal or mechanical degradation in recycled materials.
The incorporation of the differential pressure method in EN ISO 1628-1:2024 represents a significant advancement in polymer viscosity measurement. It offers a modern and efficient alternative to the traditional method, aligning with current industry needs for automation and sustainability.
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