ISO 6721-6:2019 pdf free.Plastics — Determination of dynamic mechanical properties — Part 6: Shear vibration — Non-resonance method. ISO 6721-6 describes a forced, non-resonance method for determining the components of the shear complex modulus G* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz. Higher-frequency measurements can be made, but significant errors in the dynamic properties...