How it Works
Metal
framework and panels on the exterior of buildings are easy to clean and
pristine in appearance when new. The metal becomes increasingly
difficult to clean and keep clean with exposure to natural weathering
and chemical attack that degrade the surface. The surface becomes
increasingly tarnished, discoloured and stained, making the metal
appear lifeless.
Natural
weathering is the result of sun, rain, frost and atmospheric pollution.
Chemical attack can be caused by many substances, both acidic and
alkaline. The greatest threats to metals – bare and coated
– include ultraviolet (UV) radiation, acid rain, seawater spray,
cleaning materials and run-off from mineral surfaces such as concrete
and brickwork.

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