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What is Rheology?

Dynisco, with its diverse portfolio of sensing and polymer testing equipment, brings rheology to the masses.

Rheology is the study of the flow and deformation behavior of materials when forces are applied to them. MFI and IV are sensitive to thermomechanical degradation of polymers and are therefore important parameters for quality control during the plastic extrusion process.                                                                                                                                                    Click the button below to contact our industry professionals to ask more about Rheology and understand how you can impliment this knowledge to your production environment.                                                                                   Contact Our Professionals





Rheological Measurements and The Plastic Extrusion Process                                                                                                                                                                                          In the plastic extrusion process, the elevated temperatures associated with melting processes, combined with the time that polymers spend in the barrel, can affect the molecular weight of the extrudates.                                                                                                                                                    Performing rheological measurements of a compound before, during, and after the melt processing is an efficient way to detect if any thermomechanical degradation has taken place during the extrusion process.



Why It Is Important to Avoid Degradation and Keep Polymers in Specification?

Polymer degradation has a direct impact on the properties of the final plastic product.

  • Short-term and long-term properties such as impact resistance, fatigue resistance, and enviornmental stress cracking resistance are all sensitive to the changes in molecular weight. 
  • As recycling mandates require corperations to use a certain percentage of recycled content, it is important to keep producers' reprocessed scrap or the purchased recycled materials as close to their virgin specifications as possible to maintain quality.
  • Also, the polymer is a "blind item". Recyclers and manufacturers can not tell the polymers' specifications just by looking at them.


Verification of the rheological properties of polymers is thus important to:

  • Minimize degradation during the recycling process
  • Ensure that the polymer does not degrade to affect the quality of the product



It can provide companies with accurate information that allows them to validate and if necessary adjust their process to ensure the products they make either meet or exceed their specifications. This is especially important as plants often process tens of thousands of pounds of material at a time. Without having real-time knowledge of the rheological properties of the materials, manufacturers risk spending hours producing bad products before realizing it, thereby wasting time and money, sacraficing process consistency.


Online Rheometers

Take the next step by adding a Dynisco ViscoIndicator Online Rheometer to your standard extruder that enables full lot-to-lot measurement of your production run while allowing you to send an automatic signal to your blender or feeder for real-time adjustment of your production line.
Online Rheometers

Melt Flow Indexers

Melt flow indexers provide plastics processors and recyclers with valuable information that either confirms a polymer's specification on a polymer data sheet or, in the case of recycled material, informs operators of the current melt flow index (MFI) or intrinsic viscosity (IV) of the recycled plastic.




Melt Flow Indexers






























Dynisco IoT Cloud Connect

Dynisco is now manufacturing products that can be merged with data science. IoT Cloud Connect, for example, provides a window into your processes and can help you discover new insights previously unseen. All test samples can be uploaded to the Dynisco IoT Cloud Connect by phone, tablet, or PC. This is where your polymer data can be stored and compared by device, production run, operator, and global location. The aggregation of data gives insight into the process and helps to better understand and manage control strategies that adjust the process to improve material quality, material verification at each stage of the process using correlations, variations in the properties of plastic that effected product quality, and enviornmental conditions that lead to variations in test or production processes.                                                                                           
Dynisco Cloud Connect™




Rheology Blog  Dynisco ViscoIndicator Webinar  Simplified Rheology for the Masses: A Technical Discussion


Have A Question? Ask a Dynisco expert for more information.

  • Dynisco

    38 Forge Parkway,
    Franklin MA 02038

    +1 508 541 9400  

  • Dynisco Europe GmbH

    Pfaffenstr. 21, 74078,
    Heilbronn, Germany

    +49 7131 297 0

  • Dynisco-Viatran Instrument Sdn Bhd

    Lot 3615, Jalan SM 6/8
    32040 Seri Manjung, Perak, Malaysia     

    +605 6884014

What is Rheology?
What is Rheology?