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Dry oven heat can disinfect N95 COVID masks

Justin Rowell by Justin Rowell
29.09.2022
Home Science

An n95 mask sits on a blue background

A method that uses dry ovens can disinfect N95 masks for reuse in settings where new masks may not be available, a new study shows.

Entering a third year of the COVID-19 pandemic and the latest infection surge nationwide comes with many challenges. One of those is for a continued adequate supply of masks, including the often used N95 respirator masks for health care and other settings.

To combat any shortages of N95 masks during the pandemic, many institutions were forced to search for other alternatives to protect health care providers and their patients.

While some studies have evaluated the impact of various methods of decontamination on how well masks filter viral-sized particles, the new study in PLOS ONE adds to that research and also addresses the equally important concept of maintaining proper mask fit after decontamination.

“Our study demonstrated that treatment of N95 face masks using dry heat was sufficient to inactivate COVID-19, while preserving the ability of these masks to filter aerosolized particles for potentially exposed workers,” says lead author Kenneth Shroyer, professor and chair of pathology at the Renaissance School of Medicine at Stony Brook University.

Since heat is potentially more readily accessible than other methods of decontamination in many health care facilities, the researchers used dry heat sterilization to disinfect the masks. They also used X-ray diffraction, Raman spectroscopy, contact angle, and electron microscopy collected at the Center for Functional Nanomaterials—a US Department of Energy (DOE) Office of Science user facility at DOE’s Brookhaven National Laboratory—to test for changes in the material of N95 masks post decontamination.

By contrast, other methods for disinfection, including treatment with hydrogen peroxide vapor, may be equally effective in specially equipped facilities, but are usually not available in most hospitals or outpatient clinical care facilities.

Shroyer and colleagues also tested autoclaving, which is widely available in most hospitals and is a proven method of sterilization but found that this caused the fit of the respirator onto the user’s face to fail. Thus, the researchers ruled out autoclaving as a safe method to decontaminate N95 masks.

Shroyer emphasizes that the findings from the study highlight the importance of both optimal disinfection and mask fit and suggest that when no other decontamination alternatives are available, N95 masks can be reused after dry heat treatment to ensure the safety of health care workers.

Additional coauthors are from the Center for Functional Materials at Brookhaven National Laboratory and Stony Brook University.

Source: Stony Brook University

The post Dry oven heat can disinfect N95 COVID masks appeared first on Technovanguard.


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