UV stabiliser

An additive that protects polymers, coatings and sealants against degradation by ultraviolet light, either by absorbing the radiation (ultraviolet absorbers) or by scavenging the free radicals it generates (hindered amine light stabilisers). It is used to delay chalking, colour fade and embrittlement in exterior applications.

Also known as: light stabiliser, UV stabilizer

Related terms

Weathering

The gradual change in the appearance and properties of a material caused by outdoor exposure to ultraviolet radiation, moisture, temperature cycling and airborne pollutants. Coating and material durability is assessed by natural exposure trials and by accelerated weathering tests in the laboratory.

Coatings & protectionMaterials science (general)AerospaceAutomotiveConstructionMarineGreen energyIndustrial

Chalking

A coating defect in which ultraviolet degradation of the binder at the surface leaves a loosely bound, powdery layer of pigment that can be rubbed off. It is a normal long term weathering mode of many exterior coatings and is more pronounced in binders with poor ultraviolet resistance.

Coatings & protectionAutomotiveConstructionMarineIndustrial

Topcoat

The final coat of a coating system, providing the specified colour, gloss and resistance to weathering, ultraviolet light and chemical exposure. It is the system's first line of defence against the environment and largely determines how the finish looks over time.

Coatings & protectionAerospaceAutomotiveConstructionMarineGreen energyIndustrial

UV degradation

The breakdown of polymer surfaces by ultraviolet radiation, causing chalking, discolouration, embrittlement and loss of gloss. Exposed resins, membranes and coatings are protected with UV stabilisers, pigmented gelcoats or sacrificial surface layers.

Materials science (general)Coatings & protectionRoofing & waterproofingAerospaceAutomotiveConstructionMarineGreen energyIndustrial

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