inCiTe Micro-CT Photo Friday: Flannel Sample


How long  does it take before a cloth mask becomes inefficient as protection? We used inCiTe Micro-CT to see a small flannel cloth sample. 

Flannel is a soft woven fabric that is originally made from carded wool or worsted yarn, but is now made from either wool, cotton, or synthetic fiber. Flannel can be found in any clothing item, especially in cloth masks – yes, those ones we have been all using to prevent the spreading of COVID-19.

Cloth masks have many advantages, such as affordability, reusability, and longevity. They effectively stop fluids from coughs and sneezes, making their overall protection higher1. It is recommended to change the mask every 8 hours and should wash it regularly1.

But do you know how long it takes before a cloth mask becomes inefficient against viral protection?

With inCiTe™ Micro-CT, we were able to see a small flannel cloth sample down to its fibers because some of our collaborators wanted to observe how multiple washes affect a cloth mask.   

Specialists advise that masks should be washed regularly and discarded if you notice any visible deterioration.  Visit the Health Canada website for more info on how to properly storage and wash cloth masks.


  1. Kluziak, M. & Miszewska, D. (2020). Coronavirus Mask Calculator. Retrieved from