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Aereus Shield™ Copper Coating and Chalking

Copper Alloy CoatingFor architects and designers around the world, an alloy coating must meet certain specifications; these specifications have been standardized by organizations such as the AAMA (American Architectural Manufacturers Association) and Qualicoat. When looking at a product and its finish, some of these standards include chalk resistance, gloss retention, and colour retention for coating weatherability.

What is Chalking?

Chalking is that fine powder layer that forms on the surface of a finished product. It is always preceded by gloss loss (surface roughening) and over time can cause a product’s colour to fade. Unfortunately all paints eventually chalk and many powder-coated products also chalk.

What Causes Chalking?

More often than not, chalking is the result of the alloy coating having an insufficient resistance to ultraviolet (UV) light. Sunlight or any UV light or radiation actually break down the molecules in the coating. Although epoxy-based coatings are extremely susceptible to UV, almost all types of coatings that are exposed to UV light for an extended period of time will have their molecules break down.

Some other causes of chalking include:

  • Using a low-grade resins
  • Using high-pigmented paints
  • Exposing the coating to both ultraviolet rays and moisture/humidity in the environment
  • “Over-thinning,” also known as overspreading paint
  • Not priming or preparing a surface substrate, and
  • Not sealing a porous surface

  • Why is Chalking a problem?

    Chalking causes a finish to lose colour and fade with time and if the chalking is severe, it can make repairing or refinishing a problem. Severe chalking could mean there are weaknesses and cracks in the finish, which allow moisture and other substances to get between the substrate and the finish. Heavy chalking can also negatively affect touch-ups and refinishing of an alloy coating because the new coating will try and bond with the surface powder or the cracked finish.

    How does Aereus Shield™ Copper Coating Prevent Chalking?

    Proper surface preparation is the most important aspect of coating, especially utilizing a topcoat with a higher UV resistance. Aereus Shield™ copper alloy coating is not affected by the chalking common in other finishes. Since colour is determined by the alloy, it retains its colour over time to look like stainless steel or brushed nickel, depending on the finish you choose. As with any copper, Aereus Shield can lose some of its luster but this is easily restored with products like Bar Keepers Friend. Aereus Shield must not be coated, waxed or have any other top layer applied. It is a copper alloy coating that exploits the antimicrobial properties of copper, which can only be experienced when Aereus Shield is used as the final surface coating.

    Aereus Technologies is a Canadian biotech company headquartered in Burlington, Ontario. Our research and development into copper alloy-based technology has resulted in the antimicrobial alloy coating Aereus Shield™. Contact us at 888-633-8460 to learn more about antimicrobial surfaces and how Aereus Shield™ can help enhance healthcare safety.

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    Michelle Berelowitz

    Michelle Berelowitz has 15+ years commercializing technology start-ups in the Toronto-Waterloo corridor with strong strategic, operational and management skills within both publicly traded and technology based start-up companies. Michelle has a background in manufacturing, ICT and biotech combined with degrees in political science, finance &strategic management and Masters of Business, Entrepreneurship and Technology from the University of Waterloo.