Duke researchers used masks, face covers for testing :: WRAL.com

Julian Grace, WRAL Anchor/Reporter

Durham, North Carolina — How can consumers know how much protection their face is actually providing? The new Duke University study is just trying to answer that question.

The surveys conducted at Duke are useful not only for triangles, but for all parts of the country.

Studies have shown that the fitted N95 mask works very well by keeping the droplets inside the mask. But some covers didn’t work that well.

“Keeping people healthy,” said Dr. Martin Fisher, an associate professor of chemistry. He said that each time the researcher wore a mask and uttered a phrase, he recorded the droplets that remained on each mask.

“I want to make sure I wear a working mask,” Fischer said.

Droplets were recorded using a box, laser, lens and cell phone camera. In terms of protection, the N95 Fit Mask worked well. It sealed the droplets and prevented them from leaving the mask.

“The striking mask was the N95, which is a true-fitting N95 mask,” said Fisher.

Fisher said the surgical mask was “really good”.

Despite testing, the surgical mask didn’t work as well as the N95. This is because there is a gap in the mask where droplets can escape. Researchers have found that a two-layer fabric mask has little room for droplets to escape. However, it is not as airtight as N95.

“The cloth mask was pretty good,” said the physician, Dr. Eric Westman. “They were doing pretty well. They blocked most particles.”

Bandana’s face cover didn’t work in the study. Researchers said it might look fashionable, but it did little for protection.

“Because the material is thin, it penetrates many droplets,” Fisher said. “There are many gaps in bandanas.”

Finally, and perhaps most surprisingly, the neck fleece ejected more drops than if the mask were not worn. Researchers believe this material breaks large droplets into smaller particles.

“We put them on, and we saw what more droplets would appear to come out without a mask,” Fisher said.

Duke’s researchers said the goal is to help you make an informed decision about which mask to use to protect yourself.

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