Light exposure can contribute to changes in a rubber grommet's surface and mechanical properties. Ultraviolet exposure, oxygen, temperature and moisture may act together, so outdoor durability depends on the complete compound and service environment.
Signs and limits of visual inspection
Discoloration, surface cracking or loss of flexibility can indicate deterioration. These observations do not identify a single cause or quantify the remaining life of a part. Inspect retention and other required functions as well as appearance.
Material selection
Polymers, pigments, fillers and stabilizers can influence weathering resistance. UV absorbers must be selected for the formulation; their suitability and concentration should come from validated compound data. Color alone does not establish a weathering rating.
For outdoor service, define the expected exposure and request relevant weathering-test results. Compare the measured changes with application-specific acceptance criteria. Avoid claiming a fixed lifetime from an unreferenced laboratory result or a generic material name.
