Environmental Stress Cracking (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. Environmental stress cracking may account for around 15-30% of all plastic component failures in service. ESC and polymer resistance to ESC (ESCR) have been studied for several decade... Found on http://en.wikipedia.org/wiki/Environmental_stress_cracking
(ESC) The susceptibility of a thermoplastic article to crack or craze formation under the influence of certain chemicals or aging, or weather and stress. Found on https://www.teampti.com/glossary-of-terms/