These tools allow a fine characterization of viscoelastic behavior as a function of frequency and temperature. The analysis of the data makes it possible to determine the relaxation spectra and the molecular mass distributions. The tests can be carried out on samples in the solid state:

• in torsion (RDA III de TA Instruments)
• in traction or flexion ( Q800 de TA Instruments) 

and in the molten state:

• ARES de TA Instruments
• MCR 502 d' Anton Paar

Moreover, the variations of the viscosity with the shear rate can be determined using the rhéomètre capillaire de Thermo Haake