Adhesives are chemical substances used to join surfaces. While initially strong and reliable, they can lose strength and performance over time. This change in properties is referred to as aging of adhesives.

Aging of adhesives can be caused by a number of factors such as UV light, moisture and temperature. However, not all adhesives are equally susceptible to aging. Some types of adhesives, such as UV-stabilized adhesives, are less vulnerable. Epoxy resin adhesives, on the other hand, are more vulnerable. To minimize aging of adhesives, it is important to store them properly before use and ensure they are used within their expiration date.