UV Technology


The Spread of Viruses

Strictly speaking, viruses can't die, for the simple reason that they aren't alive in the first place. Although they contain genetic instructions in the form of DNA (or the related molecule, RNA), viruses can't thrive independently. Instead, they must invade a host organism and hijack its genetic instructions.

Ultraviolet Light

The Science of UV-C (Ultraviolet Light)
  • UV radiation is present in sunlight, and contributes about 10% of the total light output of the Sun. There are three different types of UV rays; A, B and C. While they are similar, each type of ray has a different wavelength and can penetrate surfaces to a certain extent.

  • UV-C light is weak at the Earth's surface as the ozone layer of the atmosphere blocks it. The absorption length of UV-C radiation in human skin is extremely short so that almost no UV-C radiation can reach the living cells in the skin; all the absorption occurs in the dead cell layers. However, the HoldSafe unit does not emit any UV light externally and poses ZERO risk to the public. 


  • UV-C light has a short wavelength of 100-280 nm and is germicidal. It deactivates the DNA of bacteria, viruses and other pathogens and thus destroys their ability to multiply and cause disease. 

  • The UV process is a physical process as opposed to a chemical process. This is important, because it allows UV to kill bacteria and other microorganisms without creating what is known as disinfection by-products (like trihalomethanes, called THMs for short, which are proven to be carcinogenic).

How UV-C Eliminates Pathogenic Spread

In simple terms, when a pathogen (virus, bacteria or another type of microbe) is directly exposed to UV-C light, the DNA (its fundamental building block) of the cell is damaged, preventing it from replicating.


If a cell cannot reproduce, then the cell cannot cause infection, which is how UV light eliminates pathogens ability to spread

Testing shows that after the first hour of typical use, a 98% bacteria elimination level is maintained continuously as the escalator or walkway operates. Conventional disinfectants can quickly kill and reduce the number of bacteria on a surface,  however, once the solution dries, the bacteria regrows and returns to unsafe levels. The HoldSafe unit operates continuously and does not allow bacteria to regrow. Persistent prevention is the only solution to prevent the spread of viruses.

UV-C Effectiveness Verification Test Results

SGS is the world's leading inspection, verification, testing and certification company.


Test Type: 

  • Microbiological Challenge


Test strains:

  • Staphylococcus Aureus ATCC 6538

  • Escherichia coli ATCC 8739


Test Method:

  • Closed test with 5 second exposures, 2cm from UVC unit.  

Test Results:

  • Over 99% clearance effectiveness / bacteria elimination

The HoldSafe unit has been tested in certified labs and real-world applications. The use of UV-C to eliminate pathogens has been proven in multiple medical journal studies and research. Please contact us for detailed references and our test reports. 


UV Resouces

UV Basics

UV-C Studies

UV-C Test Data

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