Adhesives are a part of everyday life and are used in a wide range of applications. Maintaining the appearance of an adhesive or sealant is important for visual aesthetics as well as for what the change in appearance can signify.  

Both natural polymer materials and synthetic polymers in adhesives and sealants undergo induced discoloration as an result of degradation. The most common conditions causing color change are exposure to heat, light and the environment. Typically observed by an increase in yellowness or darkening, discoloration often appears prior to any measurable loss in physical properties. It is usually the first critical indicator that can be observed of damage which can determine the useful service life of the product.

Just as heat can destroy adhesives and sealants, so can light. Ultraviolet light, the same type that causes sunburn, can initiate chemical reactions in polymers, which result in their breakdown and loss of chemical and physical properties.

Consequently, adhesives and sealants used outdoors frequently require UV protection. There are two different classifications of light stabilizers: Ultraviolet light absorbers (UVAs) and Hindered amine (or amide) light stabilizers. Often hindered amines and UVAs are used together to provide a level of stability, which is higher than what would be provided by using either type of stabilizer by itself. Such combinations are effectively used in many adhesives.

Ciba Specialty Chemicals offers a broad range of stabilizers for use in adhesives and sealants.