DCHAS-L Discussion List Archive

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Yup.  That's the "pardon me for coughing in your face" study. I got it.  Take a look at the drawiings.  A simulated cough goes directly toward the front of the shield, and OF COURSE, only a few percent of the droplets get around the shield.  Good, one down and 359 other directions someone could cough at you and the numbers would be very different.  And it doesn't count at ALL for the aerosol that would now be suspended in the air and floating all over.

Moona

-----Original Message-----
From: Jeffrey Lewin <jclewin**At_Symbol_Here**MTU.EDU>
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Sent: Thu, Jun 4, 2020 3:32 pm
Subject: Re: [DCHAS-L] cloth face masks

Debbie,

This has been posted to other forums.

Jeff

Moving Personal Protective Equipment Into the Community
Face Shields and Containment of COVID-19

https://jamanetwork.com/journals/jama/fullarticle/2765525 

 

On Thu, Jun 4, 2020 at 3:21 PM Debbie M. Decker <00001204b93f9a5e-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:

Bulwark is marketing an FR face covering.  They are expensive and expected to be washed by the wearer.  I'm not recommending FR face coverings, any more than I recommend an FR head covering for those who wear a head covering for religious or cultural reasons.

 

I am, though, recommending natural fibers as much as possible which is similar to guidance for proper lab attire, under a lab coat.  Personally, I'm wearing a two layer face covering, made from close-woven cotton fabric.  Easily laundered and comfortable to wear all day, if need be. Managing fogged up safety eyewear is another conversation.

 

I've heard some chatter about substituting a face shield - either a medical/animal care style or an impact-resistant face shield - for a cloth face covering.  Thoughts on that option?  I haven't seen research on effectiveness, just some anecdotes.

 

My $0.02.  Your mileage may vary.

 

Debbie M. Decker, CCHO, ACS Fellow

Past Chair, Division of Chemical Health and Safety

Councilor and Programming Co-Chair

University of California, Davis

(530)754-7964

(530)304-6728

dmdecker**At_Symbol_Here**ucdavis.edu

 

Birkett's hypothesis: "Any chemical reaction

that proceeds smoothly under normal conditions,

can proceed violently in the presence of an idiot."

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Patricia Redden
Sent: Thursday, June 4, 2020 11:13 AM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] cloth face masks

 

CDC is recommending the use of cloth face mask in academic institutions, but the question is what is the best fabric for them.  Lab coats in academic labs are supposed to be chemical- and fire-resistant.  Does this apply to face masks as well?  If so, is there a source for them?

 

Patricia Redden, Ph.D.

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