QAC or Quaternary Ammonium Compound it is a biocide substance, which is widely used around the world for disinfection.
One of the main its characteristics is that QAC is absolutely secure for health and highly effective against many kinds of viruses and bacteria.

In the light of the current dramatic situation with the Covid-19, Quaternary Ammonium Compound went on the front line in all the issues of the disinfection measures, that are now taken throughout the world.
This substance is highly effective and is approved by such organizations as EPA, WHO and IATA.
EPA publishes a table ‘Disinfectants for Use Against SARS-CoV-2’ on the official site of the organization, where we can see a wide use of QAC treatment for Coronavirus Disease: https://www.epa.gov/pesticide-registration/list-n-disinfectants-use-against-sars-cov-2

As well, here is an extract from the guideline for airlines, written by IATA Organization – ’Preventing Spread of Coronavirus Disease 2019 (COVID-19)’:

‘…Preventive disinfection. It is recommended to use compound quaternary ammonium salts, double-quaternary ammonium, hydrogen peroxide or chlorine-containing disinfectants.’

The whole article here

The technical brief of the World Health Organization ‘Water, sanitation, hygiene and waste management for the COVID-19 virus’ from 3 March 2020: https://www.who.int/publications-detail/water-sanitation-hygiene-and-waste-management-for-covid-19