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What is UV-C?


The UV Spectrum

  • UV-A results in skin tanning and is used in medicine to treat certain
    skin disorders.
  • UV-B has a very high penetrating ability and results in sunburn. Prolonged exposure is responsible for some types of skin disease, skin ageing and cataracts.
  • UV-C has extremely low penetrating ability and is nearly completely
    absorbed by the outer, dead layer of skin where it does little harm. This type of radiation is filtered out by the ozone layer so that none reaches the earth’s

Existing technology makes use of the bacterial effect of UV-C light through UV-C disinfection.


  • Ultraviolet light in the C spectrum (UV-C) is energy-rich light with a
    wavelength of 200 – 400 nanometers (nm).
  • It is very versatile and can be used for disinfecting water, destroying harmful microorganisms in other liquids, on surfaces, on food products and in ‘air’.
  • Ultraviolet C is germicidal.


  • It is a non-chemical approach to disinfection.
  • It deactivates the DNA of bacteria, viruses and other pathogens and destroys their ability to multiply and cause disease. Specifically, UV-C light causes damage to the nucleic acid of microorganisms by forming covalent bonds between certain adjacent bases in the DNA. The formations of such bonds prevent the DNA from being unzipped for replication, and the organism is unable to reproduce. In fact, when the organism tries to replicate, it dies.
  • It has lethal effect on all microorganisms such as bacteria, fungi, molds,
    yeasts and viruses.


Microorganisms are microscopically small. They are everywhere and have an extremely high metabolism. For example, in hot and humid weather the number of molds and bacteria increases exponentially.

Furthermore, microorganisms produce mucus substances that are deposited on surfaces and can contaminate food and cause microbial decay of the

The cell nucleus of microorganisms contains thymine, a chemical element of the DNA / RNA. This element absorbs UV-C light at a specific wavelength of 253.7 nm and changes to such an extent (formation of thymine dimers) that the cell is no longer capable of multiplying and surviving.