Fighting COVID-19 with technology: what is medical-grade photocatalyst? Notes on purchase and usage (2)

Table of Contents

What is photocatalyst? In the last article, we introduced that medical grade photocatalyst can disinfect and effectively decompose Coronavirus for a long time. In this article, we will talk about the notes to take when buying and using photocatalyst products.

What makes photocatalyst effective?

  1. Hardness: disinfection ability

Most companies claim that their photocatalyst products are valid for several months to 5 years. When the coating of the spray photocatalyst drops, the place without the protective film no disinfection effect. The photocatalyst itself will not be consumed, but will be consumed due to wear during cleaning.

Therefore, for places where with frequent friction and touching (such as door handles, sofa, etc.), in order to achieve long-term disinfection, it is necessary to use strong photocatalyst products or sprays more frequently. We must also pay attention to the effective time reading the product label.

  1. Concentration: Decomposition rate

Fighting COVID-19 with technology: what is medical-grade photocatalyst? Notes on purchase and usage (2)

The photocatalyst relies on titanium dioxide to produce chemical reactions to decompose toxic substances. The higher the concentration of titanium dioxide, the more active the ingredients and the faster the decomposition rate. The concentration of photocatalyst products currently on the market varies from 2% to 10%. The high-concentration spray is milky white in colour.

Photocatalyst usage: Home use and professional use

In addition to have the professionals to spray photocatalyst with high-pressure spray guns, you can also buy a simple spray can for your own use. Using high-pressure spray guns to spray the photocatalyst is more effective and it can last longer as it can perform uniform spraying.

The disinfection effect using DIY method is relatively weak, but it is convenient and easy to use. Most of the spray canned photocatalyst claim to last one year. We all may not be able to hire a professional to do the work, so spraying photocatalyst by yourself on the frequently contacted areas is an ideal choice.

Notes on buying photocatalyst

How long do I need to wait after spraying the medical grade photocatalyst?

We need to wait until the photocatalyst is completely dry. The wait is for the coating to harden to prevent it from falling. Some medical grade photocatalyst products can dry in about 30 seconds after spraying and reach the maximum hardness after 10-14 days. Unless they are scraped with a hard object, they are not easy to wear.

Notes to take after spraying the medical grade photocatalyst

Dust will be generated when spraying medical grade photocatalyst. When the dust settles, dust may accumulate on horizontal surfaces (such as floor and countertops). Do not wipe away the dust immediately, otherwise the photocatalyst coating may be wiped off.

  • After 3 minutes: you can touch
  • After 2 hours: lightly wipe with dry cloth
  • After 8 hours: wipe with a damp cloth
  • The air outlet of the vacuum cleaner will blow away the dust. It is more suitable to clean the dust with a wet mop.

How to clean after spraying photocatalyst?

  • The photocatalyst coating is as hard as marble after 48 hours. It can resist vigorously wiping even with cleaning agent. Smooth surfaces require more time.
  • Avoid using organic solutions to clean the areas where medical grade photocatalyst are sprayed. Alcohol, nail polish remover and WD40 will dissolve the adhesive agent and peel off the coating.


For more information about air photocatalyst, please visit the Decoman blog:




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