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Topic: Copper against Covid  (Read 638 times)

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Offline Enthalpy

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Copper against Covid
« on: March 18, 2020, 02:34:58 PM »
Hello everybody!

A new study is available on medrxiv prior to peer-review and publication
it tells that Covid-19 "lives" shorter on a surface of copper than of stainless steel, cardboard or polymer. Silver was not tested.

A friend of mines proposes and will try to cover doorknobs with copper tape in collective houses. If the quite thin copper foil doesn't hurt the hand, this seems a good idea.

I suppose the intricate shape takes narrow tape to cover, where individual layers are loose but two overlapping layers cover the knob completely. The copper tape would end where hands don't touch if possible, and be covered by usual adhesive tape there.

All retail is closed here, but copper tape exists at Web sellers, as long as deliveries work.

Online Corribus

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Re: Copper against Covid
« Reply #1 on: March 18, 2020, 06:55:32 PM »
FYI: It is now published at NEJM.
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline wildfyr

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Re: Copper against Covid
« Reply #2 on: March 19, 2020, 02:17:26 PM »
It's still on the order of hours to disinfect. I am not surprised that the toxic effects of copper on micro-organisms works with this virus. I would be more shocked if it didn't.

It makes superoxides, and will ligate virtually any amine to snarl up molecular machinery. It will also peroxidate lipids, ruining the envelope of the virus.

Offline Enthalpy

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Re: Copper against Covid
« Reply #3 on: March 21, 2020, 10:49:15 AM »
The friend sent me pictures of copper tape on the doorhandle, appended here.

The sheet's edges are a weak point of the construction. They might hurt the user or accumulate dirt and viruses at the concave angles, spoiling the benefits of copper.

That reason favours the broad copper tape over my proposed helical winding of narrow tape.

Rounded corners would stay glued on the handle and be less dangerous.

Maybe solder would secure the edges and fill the concave angles, drawing appended. I'd also flatten the edges by pressing with a hard round tool, maybe a light hammer, before sticking and soldering, and sand after soldering.

It's not investigated against Covid, but usually silver sterilizes better than copper does. Solutions exist to deposit it on copper by immersion.

Offline Enthalpy

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Re: Copper against Covid
« Reply #4 on: March 23, 2020, 09:24:39 AM »
One step better, IF silver destroys the Covid virus efficiently:

Deposit a silver film directly on the handle or the item. Solutions exist for that. The surface acts as a catalyst, and it doesn't have to be metallic. Easier than copper, mechanically safer.

Primers or treatments may be useful, or not, to let the silver layer adhere on varied materials. Handles are often coated with some unreactive polymer. Degreasing is a minimum, maybe sanding a little bit with quite fine paper.

Silver handles could be useful in hospitals for instance.

Marc Schaefer, aka Enthalpy

Offline buzneg

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Re: Copper against Covid
« Reply #5 on: March 27, 2020, 09:23:28 PM »
I've been doing very extensive research on this. I wonder if different surface finishes, on the copper, or different types of copper would work faster. Copper sulfate, copper oxide, and zinc nano particles seem to be favored by the companies who are developing Covid killing masks. 

Here are some of links I have collected on the subject:

Korea Covid, a Virus Died within 1 minute on mask**********see comments

Two Israeli companies are finalizing development of revolutionary antiviral reusable face masks. Jan 28 2020.

Comment, all buttons in south korean hospital covered in copper plastic film

Korea Response, they spray floors
Hospital in Virginia infused coppers on fabrics, reduced spread of hospital acquired infections (HAI) by 78%. Copper Medical.

Copper Medical

"Copper is a superior metal compared to silver in terms of antibacterial properties. Copper can kill 99.9% of bacteria in 30 minutes. Silver can kill 99.9% of bacteria in 60 minutes. Copper can kill bacteria in all conditions. Silver can only kill bacteria in humid and wet conditions. Copper can also exert a Halo effect meaning that copper can even kill bacteria on objects in close proximity to the copper."

Mar 18, US government back study.
Covid-19 can survives:
in air up to 3 hours
on copper 4 hours
on Cardboard 24 hours
on plastic or stainless steel 2-3 days

Metals vs Bacteria

Copper Hard surfaces used in hospitals reduces HAI by 40-50+%

When copper alloys were used in three hospitals, it reduced infection rates by 58%

Copper kills superbug MRSA in 5 minutes

Doctor has compound with copper that kills pneumonia bacteria in a couple of hours

Copper workers in Paris were protected from several cholera epidemics

Copper works better when dry - Feb 2011
"hospital-acquired infections are becoming increasingly common and costly, killing 50,000-100,000 Americans annually, and costing more than $8 billion, according to one estimate."
"It is important to note that only dry copper surfaces are amazingly lethal to bacteria. The difference between dry and wet surfaces, such as copper pipes, is that only dry surfaces are inhospitable environments for bacterial growth. Bacteria can easily grow and reproduce in wet environments, and in so doing, they can develop resistance to copper. Resistance has not been observed to develop on dry copper surfaces."

80% of infections are spread by touch. 37,000 die in Europe per year from HAI's, as many as die on the road. 100,000 die in the USA per year from HAI's.

List of Copper products:

Copper swimming pool anodes

Copper Zap

World Health Organization report on HAI's
WHO Canada has a high rate of HIA's, outdated
2017 HAI's in Canada 7.9%
HAI's stats with video abstract.


Copper Halo Effect and more products see related articles

EPA registered copper supplies

Copper Zap on TV

Copper air ducts

Brass wallet

Thin copper coat

To kill viruses when cleaning you're susposed to keep the surface wet for 4 mins

Microban, spray on, add to paint, made of silver, copper, or zinc.

Antimicrobial door handle covers, though they only use silver

Door handle covers that secreet alchole gel

EPA list of products to use on CoV 2

Offline Enthalpy

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Re: Copper against Covid
« Reply #6 on: March 30, 2020, 05:44:20 AM »
Thanks buzneg!

Silver has an excellent reputation and a virus killer, so in comparison to copper, I wish to have the credo of Silver Medical and not just Copper Medical... Or even better, a comparative study by a research team having no obvious commercial interest in one nor the other.

Offline buzneg

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Re: Copper against Covid
« Reply #7 on: April 21, 2020, 03:39:13 AM »
I've read that silver is better in wet environments, whereas copper is better in dry, and also that silver is not as good against viruses.

Offline Enthalpy

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Re: Copper against Covid
« Reply #8 on: April 22, 2020, 05:35:03 AM »
Source? Describing experimental setup and results.

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