By VarmaSteel (9:40 am, 10/25/2022)
Are you noticing that your roof colour is fading? All paints, no matter how durable, will eventually show colour change, loss of gloss and chalking on exposure. However, there are parameters that influence its aesthetic which include pigment type, resin type, UV and thermal considerations and influence of pigment on the resin.
These parameters vary wildly based on where the roofing coil was manufactured and the quality control process behind it. So how do you limit colour loss on your roofing sheet? Well here are are some answers.
Paints consist of:
The resin in paint holds all the constituents together and is sometimes called the "binder" or "vehicle". As it is organic in nature, eg, a polyester resin, it will, over time, gradually degrade or "weather" on the surface layer with other resultant effects to cause some degree of chalking, loss of gloss and colour change.
To enable paints to flow freely as a liquid during roller strip coating, solvents must be added. The proportion is important for control of curing rate and the prevention of some paint defects, eg, solvent boil or frosting.
Additives are added for a variety of reasons including gloss control, Corstrip® release, and improvement in paint rheology.
Pigments are particles which are dispersed in the organic resin of a paint in order to provide:
The chemical composition of pigments can vary widely, but they can generally be put into one of the following 3 categories:
To ensure paint stability, inorganic paints are highly recommended. Most manufacturers use organic paints to achieve their brighter colours however to limit UV degradation and colour loss, we use manufacturers like BlueScope Steel that has a consistent reputation in using pigments that aren’t highly susceptible to UV degradation.
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