Rubber grommet aging is a change in material properties during storage or service. A part may become harder, softer, sticky or cracked, depending on the compound and exposure. Not every form of deterioration begins at the visible surface.
Heat, oxygen, ozone, light, fluids and mechanical loading can influence aging. Their importance varies with the application. Indoor parts can also deteriorate, and damage does not always require contact with oxygen.
Inspect the grommet's fit and function as well as its appearance. Record the operating conditions and investigate changes such as swelling, loss of retention or cable abrasion. Select replacement material using the actual exposure requirements and relevant compound data; appearance alone cannot establish remaining service life.
