Under which conditions does plastic resin glue deteriorate?

Plastic resin glue, commonly used in composite materials and applications involving wood in aviation, is particularly susceptible to deterioration when exposed to cyclical stress and moisture. This is because the adhesive properties of plastic resin glue can weaken over time under repeated loading scenarios, such as flexing or bending, combined with the presence of moisture. Moisture can lead to hydrolysis, which breaks down the molecular structure of the resin, further compromising its bond strength and durability.

High pressure and heat can affect adhesives, but typically, plastic resin adhesives are designed to withstand certain levels of both. Low temperature and humidity do not generally lead to deterioration; instead, they often have minimal impact on the adhesive properties. Continuous exposure to sunlight can degrade some adhesives due to UV radiation, but that’s more relevant for specific formulations rather than plastic resin glue's overall performance with cyclical stress and moisture, which directly influences its long-term integrity in structural applications.