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Subject: Re: [DCHAS-L] Nickel Carbonyl

Date: Aug 15, 2020 22:23 UTC

Author: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

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Subject: Re: [DCHAS-L] Nickel Carbonyl

Date: Aug 15, 2020 23:58 UTC

Author: Eugene Ngai <eugene_ngai**At_Symbol_Here**COMCAST.NET>

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From: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>

Subject: Re: [DCHAS-L] Respirator physicals?

Date: Aug 15, 2020 22:29 UTC

Reply-To: Monona Rossol

In-Reply-To: Re: [DCHAS-L] Respirator physicals?

Demystify: 

Or you have metal ears.  Ear loops just can't anchor a mask tightly enough to get a seal.  Monona


-----Original Message-----
From: Reinhardt, Peter <peter.reinhardt**At_Symbol_Here**YALE.EDU>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Sat, Aug 15, 2020 4:51 pm
Subject: Re: [DCHAS-L] Respirator physicals?

Anything that covers a mucous membrane will reduce your risk of infection-masks, respirators, safety glasses. With aerosols, an N95 respirator will prevent inhalation.
 
Nearly all KN95s what we have received has ear loops. You just can't get a tight fit with any mask with ear loops unless the sizing is perfect.
 
Pete
 
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of John Callen <jbcallen**At_Symbol_Here**GMAIL.COM>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Date: Thursday, August 13, 2020 at 8:32 AM
To: "DCHAS-L**At_Symbol_Here**Princeton.EDU" <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] Respirator physicals?
 
Pete,
 
Thanks for adding into the conversation!
 
Just several comments and/or questions..
 
  • Paragraph 2, Sentence 2: Is the risk based upon an infectious person not having or having a mask or respirator on, or it doesn't make a difference?  Also, where does the use of safety glasses or goggles fit into the picture.
 
  • There is a reason why many of the KN95 masks may not fit.  Anthropomorphically speaking, they are designed for the smaller Asian and not the American or even Polynesian face.  Going back to the original Los Alamos Protection Factor Study by Ed Hyatt et al (UC-41, May 1974), please see Figures 14 &16, Pages 25 & 26  with the 16-man and 25-man Test Subject Panels or for that matter any of the panels today which also include women. You are looking these KN95 respirators fitting more easily on the 9-cell matrix of Face Length versus Face Width in the Middle Left & Middle Center and Bottom Left & Bottom Center cells.  With that in mind, where you not even able to fit any Asian Yale students or faculty?   
 
Thanks!
 
Be Safe, Secure & sound, Vigilant and Well!
 
All My Best,
 
John B. Callen, Ph.D.
3M Personal Safety Division - Retired
ACS/DCHAS Founding Member
(312) 632-1095
 
 


On Aug 13, 2020, at 4:58 AM, Reinhardt, Peter <peter.reinhardt**At_Symbol_Here**YALE.EDU> wrote:
 
Lots more research is necessary, here.. Aerosols appear to be an important means of COVID-19 transmission, however the evidence still points to large droplet spread as being the predominant means of transmission. (Fomite transmission contributes also, but in minor way.) Thus, in public areas, the six foot distancing rule is an every effective for reducing transmission and should be one of our key messages, along with mask-wearing, hand washing and not touching one's face.
 
Regarding aerosols and droplets, we still don't know how many virus particles will cause an infection, but it is likely that a droplet will contain more of them than a finer particle. Further, distance, space, dispersion will all generally result in a lower probably of an infectious dose landing on your mucus membranes. Your risk will always be higher when standing within six feet from an infectious person than if standing twenty feet away.
 
p.s., Yale has 100,000 KN95 masks and we can't fit people to any of them.
 
p.s.s., We don't normally do spirometry as part of our respirator medical evaluations, unless the person's medical history indicates its necessity.
 
p.s.s.s., Re the "medical paper mask" comment, ASTM surgical masks used in hospitals are effective droplet protection and do provide some filtration. Years of evidence has proven their effectiveness in preventing disease in healthcare workers. See https://www.cebm.net/covid-19/what-is-the-efficacy-of-standard-face-masks-compared-to-respirator-masks-in-preventing-covid-type-respiratory-illnesses-in-primary-care-staff/ For infection control, these same masks are used in healthcare facility for "source control" (e.g., transporting a TB patient), which I agree is not PPE.
 
Pete Reinhardt, Yale EHS Director
 
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Reply-To: Monona Rossol <actsnyc**At_Symbol_Here**cs.com>
Date: Wednesday, August 12, 2020 at 8:39 PM
To: "DCHAS-L**At_Symbol_Here**Princeton.EDU" <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] Respirator physicals?