ISO 6721-5

ISO 6721 Part 5 is one of the most commonly used test standards for conducting DMA of Plastics in Flexure. The test procedure characterizes the viscoelastic properties of thermoplastic resins, thermosetting resins and composite systems. Using rectangular specimens, ISO 6721-5 determines the storage (elastic or E’), loss (viscous or E”) and complex (E*) moduli, as well as tan delta (Tan δ), as a function of frequency, temperature, or time. These properties provide insights into the thermomechanical performance, including glass transition temperature (Tg), damping behavior, and effectiveness of cure.

 

NOTE: When characterizing polymer materials using DMA, it is particularly critical to have accurate test data. This is especially true when generating Master Curves, the most practical way to predict long-term product life using short-term test data. Leveraging the Williams-Landau-Ferry (WLF) model and its frequency-temperature test data shift procedures, this invaluable master curve methodology increases both the capabilities and the efficiency of the test lab. Accurate test data is so important here because small data errors can lead to large errors in material life estimation.

 

Solutions for ISO 6721-5 typically include these types of components:

 

Both the MTS Acumen® and the MTS Landmark® High-Force DMA test systems are ideal for conducting dynamic mechanical analysis (DMA) of polymers per ISO 6721-5. They offer a variety of force capacities and deliver up to 100 Hz (covering three decades) of precise frequency controlled test protocols to accommodate a wide variety of DMA and other fatigue testing needs. The compact MTS Acumen systems’ electrodynamic actuation consumes less energy than other technologies, and provides a clean, quiet, and cost-effective system operation. The MTS Landmark 100 Hz Elastomer Test System is a tabletop system that features MTS servohydraulic actuation technology, and is the preferred test system when testing requirements demand higher force capacities.