About the super antibacterial performance of brass

Brass is an alloy mainly composed of copper and zinc, and mainly contains 60% to 70% copper and 30% to 40% zinc. It is known that not only copper, which is the main component, but also copper alloys containing more than 60% copper have super antibacterial properties.

In March 2008 , the U.S. Environmental Protection Agency (EPA) approved that copper, brass, and bronze ( alloys containing about 85% copper ) are effective for public health by sterilizing active ingredients that are harmful to the human body and can be lethal. The label has been legally approved.


[Antibacterial < sterilization ≤ sterilization < sterilization]


You may be unfamiliar with the expression super antibacterial, but if you apply it to the above formula, it is more than antibacterial and less than sterilization.

Since the word sterilization can only be used for pharmaceuticals or quasi-drugs whose effects have been approved by the Pharmaceutical Affairs Law, metal products are almost excluded.

Since sterilization means "removing bacteria", it is often used for products that actively remove bacteria, such as detergents, alcohol sprays, and cleaning sheets.

The actual definition is "when using a product with a disinfecting effect and a product without a disinfecting effect, the one with a disinfecting effect reduces the number of living bacteria after use", and is used in products according to the voluntary standards of industry groups. is the word

Unlike the above, antibacterial is an expression that is widely used regardless of the target, but it means "to suppress the growth of bacteria." As mentioned above, the words that can be used differ depending on the product, and the expression "super antibacterial" has been proposed for copper and copper alloys, which are recognized to have a bactericidal action that goes beyond the suppression of bacteria.

Metals other than copper ( copper alloy ) have antibacterial properties, and silver is a typical example of a metal that is less harmful to the human body than copper.

In addition to the above, Cobalt, Aluminum, Nickel, Zinc, Palladium, Molybdenum, and Tungsten were commonly found to have antibacterial properties in tests against Escherichia coli and Staphylococcus aureus.

Also, when copper and silver are compared, it is said that silver is more effective at around body temperature (37 °C ) , but is much less effective below standard pitch (25°C) . Copper always kills bacteria to less than 1/1000 in 2 hours regardless of temperature (MRSA , O-157 , Pseudomonas aeruginosa ) .

Shiseido has a series of antiperspirants called Ag + ( recently shifted to Ag DEO 24 ) that uses the antibacterial and bactericidal action of silver, but since silver is expensive, it is added in the form of silver ions, which can cause body temperature and metal allergies. It seems to be suitable for the application because of its low nature. On the other hand, copper and copper alloys are cheaper than silver and are widely used (copper in 10 -yen coins and brass in 5 -yen coins ) . I can say


The super antibacterial properties of copper and copper alloys are effective when fungi come into contact with the surface. It seems that the higher the purity, the higher the effect, but it seems to be effective even if the surface is discolored due to oxidation, etc., so it is good news for brass lovers who enjoy the change in color from platinum gold to antique gold over time. .

Based on the above information, it can be said that products made of brass can be expected to have super antibacterial performance semi-permanently in daily use due to the copper component.

While each consumer is searching for a lifestyle that conforms to the "new lifestyle" advocated at the expert meeting in the environment of with Corona, DIARGE will continue to brush up lifestyle proposals that are rich in mind and body, centered on brass products. I would like to try to actively develop products and disseminate information so that I can improve and meet the expectations of customers.

[Reference site]

Super Antibacterial Performance of Copper / Japan Copper Center


Antibacterial properties of metallic materials / Yoshihiro Sato


Surprisingly unknown difference between "sterilization", "antibacterial" and "sterilization" / For your LIFE powered by Fumakira