KN95 Chinese standard. Only N95 with NIOSH label is US-certified

来源: 2022-01-14 09:43:30 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读: 次 (62399 bytes)

KN95 is Chinese standard. Only N95 with NIOSH label is US-certified.

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How long you can wear your N95, according to experts

https://www.cnn.com/2022/01/13/health/n95-mask-wear-care-tips-wellness/index.html

By Kristen Rogers, CNN

Updated 9:43 AM ET, Fri January 14, 2022

 

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(CNN)You're ready to swap your old cloth masks for N95s as some experts recommend, but the higher price tag and two little words -- "single use" -- are giving you pause. How long can you really wear an N95 and still protect yourself and others from Covid-19 risk?

 

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Counterfeit N95 masks are everywhere. Here's how to spot them

 

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"I wear mine for a week," said Linsey Marr, a professor of civil and environmental engineering at Virginia Tech.

An N95 mask's material and filtration ability aren't "going to degrade unless you physically rub it or poke holes in it," Marr said. "You'd have to be in really polluted air ... for several days before it lost its ability to filter out particles. So, you can really wear them for a long time.

"People have been talking about 40 hours -- I think that's fine. Really, it's going to get gross from your face or the straps will get too loose or maybe break before you're going to lose filtration ability," she added.

The reason why N95 masks are designated as single use is because they're categorized as medical masks, said Erin Bromage, an associate professor of biology at the University of Massachusetts Dartmouth.

A man wears an N95 face mask.

A man wears an N95 face mask.

In medical settings, health care workers change masks more frequently to avoid "cross-contaminating a patient room with equipment that was worn in a room of an infectious person and then moving to the next room and bringing that infection with you," he said. "When you then take a medical-grade thing that's single-use and put it in the general public, we're not worried about you cross-contaminating different environments you're being in. It's really about providing protection to you."

N95s "used to be only $1 or so each," Bromage added, but prices have recently spiked as public demand for these masks has increased amid Omicron variant concerns. If you safely reuse N95s, you're getting at least two or three days of use from one mask, Bromage added, but "I realize that it still adds up to an expense."

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Some local public health departments, such as the Maryland and Milwaukee health departments, are offering free N95 masks.

Here's what else you should know about safely wearing and reusing N95 masks.

Why N95s?

Compared to cloth masks, properly fitted N95s better prevent tiny particles from getting into your nose or mouth thanks to certain materials -- such as polypropylene fibers -- acting as both mechanical and electrostatic barriers to shared air, the primary driver of coronavirus infection.

The difference between N95 and KN95 masks is where the mask is certified, according to Oklahoma's state health department. The US certifies N95s, whereas China approves KN95s. Around 60% of KN95 respirators sold in the US are counterfeit and don't meet the requirements of the National Institute for Occupational Health & Safety, according to the US Centers for Disease Control and Prevention.

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Why you should upgrade your mask as the Omicron variant spreads

"If they're made to the standard and certified by the appropriate boards in their country like NIOSH here, they all do basically the same thing," Bromage previously told CNN. "But there is a ton of knockoffs that are not certified in the KN95 side of things, that may meet the standards but they're not certified to meet it. And there's others that clearly don't."

N95 masks "are not made for kids," Marr said. "For larger kids, my 10-year-old wears an N95 that comes in a small size (intended for adults)."

"If you see an N95 as marketed for children, that should raise a red flag," Marr added. "There will be KN95 and KF94s that are designed for and marketed for children. With those, it's the same issue as we discussed for adults, which is to make sure you're getting them from a trusted, reputable source, because there's a problem with fake KN95s that are not nearly as protective as they should be."

Project N95, the National Clearinghouse working to provide equitable access to personal protective equipment and coronavirus tests, is a reputable source for N95 and KN95 masks, Marr said.

KF94s are Korean-standard masks.

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Little kids can likely read your emotions even when you wear a face mask, study finds

"Certainly, for children, a KN95 or KF94 will provide better protection on average than a surgical mask or cloth mask," Marr said.

You might have to try a few different brands or shapes of KN95s, KF94s or small N95s to find one that fits well and is comfortable for your child, Marr said. If you still have trouble fitting the mask to your child's face, you can tie the ear loops or use toggles or cord lock adjusters to ensure the mask fits tightly enough, she suggested. This CDC video on the knot and tuck method might also help.

Reusing an N95 mask -- and when not to

To reuse N95 masks as safely as possible, avoid touching the front outer part of the mask when putting it on, Marr said. Instead, try to handle it by the edges or straps. "Definitely avoid the part right in front of where you breathe, like right in front of your nose and mouth," she added.

Even after wearing an N95 in a crowded indoor setting -- such as a subway -- Marr said "these masks are really designed to handle a lot of particles and will continue to work."

However, a known exposure should affect your approach. If "I was working in an office and I was wearing an N95 and someone in my office had tested positive, I'd know I was well-protected," Bromage said. "But I'd probably throw out that mask. Because that mask has done its job of trapping the virus and I don't even want to take the risk of it being there and getting on my hands or whatever."

There are plenty of N95 masks, but they're not designed for your kids

 

There are plenty of N95 masks, but they're not designed for your kids

That you could have unknowingly been near an infected person in any other public space -- such as a subway or grocery store -- while wearing an N95 mask is possible. Staying at least 6 feet away from others as much as possible can help reduce Covid-19 risk.

If the mask becomes damp, visibly dirty, bent, creased or otherwise damaged -- including from wearing makeup -- you need to replace it since these conditions could decrease the mask's effectiveness, Marr and Bromage said.

"The longer you wear it, the more it's actually trapping material -- which means that the breathability, the resistance of the mask, starts to decrease," Bromage said. "One of the first indicators of being able to change it if it looks nice and clean is that it just feels a little harder to breathe through. There appears to be more resistance with every breath."

How to sanitize N95 masks

The longer and more frequently you wear an N95 mask, the more contaminated it can become. But particles will die off over the course of a few to several hours, Marr said, and even faster if you set the face covering aside in sunlight.

"Things like temperature and sunlight have an effect, but you don't want to be throwing it in an oven or microwave," Bromage said. "I used to stick mine on the dashboard of my car in summer, and that would do more than enough in regards to the heat and the direct light that it was getting. But in reality, there's nothing you can really do to extend its life through cleaning that is accessible to an average person."

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Because N95 masks have that special static charge that helps filter out viruses, you shouldn't wash the masks, as water will dissipate the charge, Marr said.

Overall, the contamination risk in reusing N95 masks is "lower, much lower, than the risk of you not wearing an N95 and breathing in particles," Marr said. "I don't want people to avoid wearing an N95 because they're worried about contamination on an N95. The N95 is going to provide a major net benefit."

This story has been updated with additional detail about children's masks.

所有跟帖: 

差不多了 -fuz- 给 fuz 发送悄悄话 fuz 的博客首页 fuz 的个人群组 (0 bytes) () 01/14/2022 postreply 09:50:49

我们几周前刚开始使用一种新的N95,Aura 9205,也是3M的,比原来的N95 1860带着舒服多了。 -老道- 给 老道 发送悄悄话 老道 的个人群组 (88 bytes) () 01/14/2022 postreply 11:17:15

戴上是这样的。 -老道- 给 老道 发送悄悄话 老道 的个人群组 (88 bytes) () 01/14/2022 postreply 11:23:31

Where did you get 3M 1860 NIOSH N95 or 3M Aura 9205 NIOSH? from -TJKCB- 给 TJKCB 发送悄悄话 TJKCB 的博客首页 TJKCB 的个人群组 (94 bytes) () 01/14/2022 postreply 11:51:18

No. At work. -老道- 给 老道 发送悄悄话 老道 的个人群组 (0 bytes) () 01/14/2022 postreply 11:57:08

找万能 Amazon。这个是吗? -pickshell- 给 pickshell 发送悄悄话 pickshell 的个人群组 (196 bytes) () 01/14/2022 postreply 12:03:23

Got it. Like in the photo. Thx! -TJKCB- 给 TJKCB 发送悄悄话 TJKCB 的博客首页 TJKCB 的个人群组 (0 bytes) () 01/14/2022 postreply 13:36:53

这个应该是NIOSH批准可以在医院使用的(和1860一样)。在我知道的范围内医院没有在医护人员中发放使用KN95。 -老道- 给 老道 发送悄悄话 老道 的个人群组 (0 bytes) () 01/14/2022 postreply 14:11:16

这个看着很像KFN95型 -白兔妈- 给 白兔妈 发送悄悄话 白兔妈 的博客首页 白兔妈 的个人群组 (0 bytes) () 01/14/2022 postreply 12:28:11

看着不错/你们有人试过韩国产的KF94吗?跟这个也有些像 -awr- 给 awr 发送悄悄话 awr 的个人群组 (0 bytes) () 01/14/2022 postreply 12:39:29

我用了很久了 -白兔妈- 给 白兔妈 发送悄悄话 白兔妈 的博客首页 白兔妈 的个人群组 (29 bytes) () 01/14/2022 postreply 13:29:49

我买的就是这种。戴着觉得确实不太难受。不知道是否有同样的保护效果 -viewfinder- 给 viewfinder 发送悄悄话 viewfinder 的博客首页 viewfinder 的个人群组 (0 bytes) () 01/14/2022 postreply 16:26:29

我这两种都有,感觉还是1860更有效但没有数据支持,可能是先入为主吧。在接触已知阳性病人时,还是选择1860的人多一些。 -老道- 给 老道 发送悄悄话 老道 的个人群组 (0 bytes) () 01/14/2022 postreply 16:37:35

谢谢!小心为上,多保重! -viewfinder- 给 viewfinder 发送悄悄话 viewfinder 的博客首页 viewfinder 的个人群组 (0 bytes) () 01/14/2022 postreply 16:41:22

谢了。 -老道- 给 老道 发送悄悄话 老道 的个人群组 (0 bytes) () 01/14/2022 postreply 17:34:11

压紧点让人放心,除非戴很长时间 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 17:37:12

这有篇可供参考。有9205 vs 1870 的比较,简单说都属N95 都能提供较好保护,设计上9205更舒适,而 -pickshell- 给 pickshell 发送悄悄话 pickshell 的个人群组 (335 bytes) () 01/14/2022 postreply 18:04:49

多谢多谢!9205 看来不错 -viewfinder- 给 viewfinder 发送悄悄话 viewfinder 的博客首页 viewfinder 的个人群组 (0 bytes) () 01/15/2022 postreply 03:05:13

KN95流行于美国,是美国制造业彻底没戏的表现。2020年,美国舆论大肆抨击中国口罩,现在新闻里各行业工会大声疾呼要KN95 -L1- 给 L1 发送悄悄话 L1 的博客首页 L1 的个人群组 (2903 bytes) () 01/14/2022 postreply 12:52:04

前两天在超市看到美国产的肥皂盒,不容易,就像我们国内70-80年代的那种,或者更早,1刀两个 -zongzaipiao- 给 zongzaipiao 发送悄悄话 zongzaipiao 的个人群组 (0 bytes) () 01/14/2022 postreply 15:35:12

美国塑料行业是很发达的 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 15:51:17

这么可能?米国产的一刀两个,, -tt10- 给 tt10 发送悄悄话 tt10 的个人群组 (0 bytes) () 01/14/2022 postreply 17:36:30

千真万确的写着made in USA.我也很不解,不过是很简单老式的,估计是库存? -zongzaipiao- 给 zongzaipiao 发送悄悄话 zongzaipiao 的个人群组 (0 bytes) () 01/15/2022 postreply 06:48:33

美国的塑料行业很发达,以前中国是从美国进口原料。台塑在休斯顿好象有厂。 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/15/2022 postreply 09:22:39

忘了在哪看到的,说现在市面上的口罩60%不合格,估计就是映射外来的口罩,可美国自己的口罩又供应不上,而且很贵 -zongzaipiao- 给 zongzaipiao 发送悄悄话 zongzaipiao 的个人群组 (0 bytes) () 01/14/2022 postreply 15:38:02

中国产的很多KN95密封很差,还不如普通口罩 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 15:54:45

估计我买的就是这种,感觉还没有普通医院口罩好,所以我现在在人多的地方都是一般医用口罩,外加kn95 -zongzaipiao- 给 zongzaipiao 发送悄悄话 zongzaipiao 的个人群组 (0 bytes) () 01/15/2022 postreply 06:44:41

至于中国产的普通口罩,我手上就有几个缺铝条的;还是某大公司出品的 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 15:56:36

可以单买铝条,这个是我买的,很好用。 -TBz- 给 TBz 发送悄悄话 TBz 的博客首页 TBz 的个人群组 (1079 bytes) () 01/14/2022 postreply 18:31:05

这个好玩,谢了 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 20:21:09

美国产的口罩也不咋地 -fuz- 给 fuz 发送悄悄话 fuz 的博客首页 fuz 的个人群组 (0 bytes) () 01/14/2022 postreply 17:10:56

现在挑口罩,跟你去挑蔬菜一样难 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 17:38:49

俺在前几个月低谷时买了一堆各式口罩,(便宜啊),选了一种尺寸较大的医用口罩,和一种符合脸型的KN95,留给自己用 -fuz- 给 fuz 发送悄悄话 fuz 的博客首页 fuz 的个人群组 (0 bytes) () 01/14/2022 postreply 19:11:30

所见略同,我准备了至少一年的量。 -周老大- 给 周老大 发送悄悄话 周老大 的博客首页 周老大 的个人群组 (0 bytes) () 01/14/2022 postreply 20:22:52

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