Questions & Answers

Q: What is "Cu+"?
A: "Cu+" is a brand for antimicrobial copper and copper alloys, which have been verified to work very effectively against some of the most toxic species of bacteria, fungi and viruses, including MRSA.

Q: How does copper and copper alloys work as antimicrobial?
A: Copper and in many copper-bearing alloys have inherent antimicrobial properties. It has been demonstrated clearly in many scientific studies that copper has rapid, broad spectrum antimicrobial efficacy.

Q: Where can Cu+ antimicrobial copper be used?
A: in hospitals, schools, public transport, etc, where people are contacting surfaces. For example, replacing the most bacteria contaminated surfaces in clinical test in an intensive care unit of a hospital showed initial results of 40-69% lower risk of acquiring a hospital infection.

Q: Where can Cu+ copper and copper alloys and products be purchased?
A: Aurubis group is supplying Cu+ copper & alloys with several partners together with the global antimicrobial team support from ICA and CDA.

Do you have more questions?
Please contact us at antimicrobialcopper(at)aurubis.com

More detailed info about Cu+
http://www.antimicrobialcopper.com
More Q&A's

Information in Scandinavia can be found at: http://www.scda.com

Why and how does copper change colour?

Copper has excellent atmospheric corrosion resistance. It becomes naturally covered with a oxide film changing colour dark brown/black in normal atmospheric conditions. Later the green patina forms on copper outdoors with a varying rate depending on where and how the surface is exposed. Copper doesn’t need additional technical maintenance (like painting) by time.

How can the staining of materials by copper be prevented?

Care should be taken when using copper above or close to mortar, cement, marble, stone and other porous materials. Copper runoff may cause bluish stains for these materials. To prevent such stains, the use of longer overhangs, sloping of copper surfaces away from other materials, gutters, and drip edges are all recommended.

What is galvanic corrosion and how it can be prevented?

Metals are rated according to their nobility ratings. When dissimilar metals are in contact with each other in the presence of oxygen and moisture, the more noble metal will corrode the less noble. Copper is one of the most noble of metals and must be separated from other less noble metal. Contact between dissimilar metals should always be avoided. Painting, taping or gasket with non-absorptive materials is also effective.

Care should be taken to prevent the wash from copper surfaces onto adjacent, exposed less noble metal surfaces, since the traces of copper salts carried in the wash can accelerate the corrosion of less noble metal.

How is possible to remove finger marks from copper?

Grease, oil and finger marks can remove by using low alkali washing agents even the acetone can be used. This should do as soon as possible after staining. Washing agents including ammonia or chlorides should not be used.

There are many commercial polishing chemicals available in the market. E.g. 5% citric acid liquid is environmental and user friendly option when slightly oxidized surface want to polish.

How is possible to remove graffiti’s from copper?

Removing of the graffiti is challenging. Chemicals like acetone are needed to remove paint. Very often also mechanical abrasion is needed to remove all graffiti from material. The dark oxide layer will remove together with graffiti leaving bright area. There’s certain copper darkener chemicals on markets. The use of those may cause constant colour difference between naturally oxidized and chemical treated area. Good option is to wait and let natural oxidation process cover bright area with new layer of dark oxide.

How can copper be coated to prevent staining and oxidation?

Clear coats help preserve the natural or mill finish. A clearcoat may be as simple as a coat of wax or as advanced as a hi-tech acrylic lacquer. The choice depends on the situation. Clear coats are typically formulated to keep the metal very reflective, and their use is also intended to prevent tarnishing of the metal from fingerprints and oxidation. One drawback is they are not permanent and will require maintenance over the years. Typically clear coats applied to an interiorfeature will have a longer life than exterior applications, but they are subject to abrasion and may be susceptible to ultraviolet degradation.

What are the environmental concerns regarding water run-off from copper-roofs?

The risk assessment and 16 years of run-off studies for copper building sheets conclude that using copper as building material is totally safe for water, soil and agriculture.

More information e.g. http://copperalliance.org.uk/resource-library

http://copperalliance.org.uk/copper-and-society/environment

How can copper be coated to prevent staining and oxidation?

Another option which can be considered for applications indoors is clear coatings. Clear coats help preserve the natural or mill finish. A clearcoat may be as simple as a coat of wax or as advanced as a hi-tech acrylic lacquer. The choice depends on the situation. Clear coats are typically formulated to keep the metal very reflective, and their use is also intended to prevent tarnishing of the metal from fingerprints and oxidation. One drawback is they are not permanent and will require maintenance over the years. Typically clear coats applied to an interiorfeature will have a longer life than exterior applications, but they are subject to abrasion and may be susceptible to ultraviolet degradation.

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Antimicrobial Copper

Antimicrobial Copper