PVDF coatingPVDF

A continuous, factory controlled process in which paint is roller applied to coiled metal strip, cured in ovens and rewound before the strip is cut and formed into components. It is the basis of pre-finished steel and aluminium sheet used for roofing, cladding and rainwater goods.

A thick, usually embossed coating based on PVC dispersed in plasticiser, applied by coil coating over primed, galvanised steel used for profiled roofing and cladding sheets. It offers good formability and durability, but cut edges and mechanical damage need maintenance to prevent edge corrosion and peel back.

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.

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.