Back in mid-Feb. I decided to research and educate myself on the differences of the various disposable respirator masks, with the intention on purchasing some for us. As many of us discovered, the recommended N95 face masks had already been sold out on Amazon and other retailers. Upon further research and online searching, I decided to purchase a number of 3M P95 Particulate Respirators, (Model 8577). It is a universally-sized, molded, disposable latex-free, respirator with an exhalation valve and nose clip and dual head strap. I learned that compared to N95 respirator masks, the P95 masks have a broader spectrum of protection that surpasses that of N95 masks, to include oily-based particles. Also, as an added benefit, the P95 masks have a rated 40-hour service life, as opposed to only and 8-hour rating for the N95 masks.
Amazon was already sold out of the P95’s, but I was able to find them on eBay. They ordinarily sell for $9.00 for a 2-pack. Of course, the sellers had already started to greedily mark up the price. I ended up paying $24.00/each for two 2-packs. Now, it is almost impossible to find these respirators anywhere for any remotely reasonable price.
Now in mid-April in NJ, we are required by State mandate to wear some form of protective face masks when we are going grocery shopping. It is also strongly recommended by healthcare experts that people wear face masks when they go to other places where other people will be congregating. So the whole face mask issue of material type, filtration, re-usability and disinfection, has now become important topics.
As has been stated earlier, due to the acute shortages and unavailability of new replacement N95/P95 face masks, those of us who have a small number of them are forced to re-use these protective face masks. Therefore, figuring out the best way to disinfect these N95 and P95 face masks is very important in order to prolong their usability and filtering effectiveness, while also regularly disinfecting any pathogens that may have landed on them.
After discussing various face mask disinfecting/sterilizing approaches and options with my regular medical doctor and my dentist, their consensus was that using ultra violet light, specifically Ultra Violet Germicidal Irradiation (UVGI), was the most effective method to kill germs and bacteria, including the COVID-19 pathogen. They recommended this method because it was also considered to be the least detrimental method that would diminish the protective filtration quality of the mask, in its task of preventing penetration of the harmful particles in the air. They cautioned that while this method is not perfect, in that repeated use of this method of exposure to the UVGI will very slightly degrade the filtering quality against aerosol penetration. But they said that it was far better than using 70% isopropyl alcohol or soap & water, since those methods would seriously reduce the masks effectiveness and longevity.
To verify their opinion, both doctors referred me to a published report on a study that was performed in January 2016 by the National Institute of Health, titled: “Effects of Ultraviolet Germicidal Irradiation (UVGI) on N95 Respirator Filtration Performance and Structural Integrity”. If you are interested in reading this document it can be found online in the archive of biomedical and life sciences journal literature at the U.S. NIH, National Library of Medicine’s (NLM), PubMed Central (PMC). Here is a general link:
https://search.nih.gov/search?utf8=✓&affiliate=nih&query=UVGI&commit=Search
My dentist also had referred me to a disinfecting device that his patients who have Sleep Apnea and use CPAP machines to help them get a good night’s sleep, in addition to not snoring. The device is the 3B Medical Lumin CPAP Mask and Accessories Cleaner. That device, the size of a large toaster oven with a large drawer, is used on a regular basis to disinfect CPAP face masks, water reservoirs and hoses, by using ultra violet light. It uses a strong UV light to kill 99% of bacteria, pathogens and fungi present on items placed inside the device. He said I can use that same device to also effectively disinfect and sterilize our P95 face masks, as well as our cell phones. I purchased this device and now I put the mask into the drawer, face up and start the automatic timed disinfecting process of the entire outside surface of the mask. Once finished, I turn the mask over 180 degs. and start the process again, in order to disinfect the inside surfaces as well. I do the same for our cell phones. Here is a link to that device:
https://www.cpap.com/productpage/3B-medical-lumin-uv-cpap-sanitizer
So far, using these face masks (respirators) and UVGI disinfecting method with this device has been working well for us and we will continue to use them as long as necessary.
AVB-AMG