Well, this is for the OCR Advanced Physics Materials coursework the definition of toughness we got given was that it was simply the opposite of brittleness. which is stated in the tough definition:
Tough if the material does not break by snapping cleanly. A tough material is resistant to the propagation of cracks. Toughness is the opposite of brittleness. Metals are tough, and break by plastic flow. There is no one simple measure of toughness, but a tough material will dissipate a large amount of energy of energy per unit area of new fracture surface.
but when I search for the toughness of neoprene all I seem to get is the "Fracture Toughness" and loads of pages have different numerical values and different units. So I am unsure.
The breaking stress of neoprene (CR) is also a problem if you could help me there also.