15%. Therefore, bubble gums can withstand more substantial stresses before break-up than normal chewing gums. This distinction is mainly due to its on-purpose design, which allows it to form and maintain large, stable bubbles when blown up through sizeable shear stress on the tongue.

The different values of Hencky strain rates can lead to either extensional viscosity plateaus before sagging (macroscopic failure) or necking (strain hardening) following a low/high strain rate.