Elongation at Break, also known as fracture strain or tensile elongation at break, is the ratio between increased length and initial length after breakage of the tested specimen at a controlled temperature.
It is related to the ability of a plastic specimen to resist changes of shape without cracking.
https://omnexus.specialchem.com/polymer-properties/propertie...Physical and mechanical properties of natural fibers
S.R. Djafari Petroudy, in Advanced High Strength Natural Fibre Composites in Construction, 2017
3.4.2 Elongation at break (%)
https://www.sciencedirect.com/topics/engineering/elongation-...Solid Rubber that exhibits a high Elongation at Break but a low Tensile Strength may be indicative of a poorly mixed or under cured polymer, which if used to produce Rubber Gaskets or Seals will see premature failure.
https://maclellanrubber.com/definitions/elongation-at-break(a) Tensile strength; (b) elongation at break and (c) tensile modulus of plasticized PLA.
https://www.researchgate.net/figure/a-Tensile-strength-b-elo...(All from the 1st page, where material is specified)