EPDM is especially resistant to cracking, especially when installed and maintained correctly. Impropoer installation or physical damage may weaken the EPDM's structure and lead to eventual cracking. This includes excess tension or stress caused by physical impacts. Age and exposure to chemicals can also eventually lead to cracking in the material. It's important to inspect your liner and ensure that its functioning properly over time.
Long periods of exposure to extereme temperatures or contact with solvents, acids, and oils can cause the material to become brittle and more prone to cracking. Do your research into what your exposing your liner material to, and how it may affect its ability to withstand stress and tension.
