On Wed, Jun 6, 2018 at 10:33 AM, Dan Nowlan <dnowlan**At_Symbol_Here**berrymanproducts.com> wrote:

This ISO method is intriguing-and expensive ($162). I'm curious if it might be suitable for screening refrigerants/HFCs/HFOs for use as a flash point suppressant in an otherwise flammable chlorinated solvent (or solvent mixture containing a splash of IPA for water take-up). Any constructive feedback would be greatly appreciated.

Best regards,

Dan Nowlan

Chemist, R&D

Berryman Products, Inc..

(817) 640-2376, ext. 147

From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU] On Behalf Of Whitney Rochelle Hess
Sent: Tuesday, June 05, 2018 8:38 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: Re: [DCHAS-L] 4% vs. 5% hydrogen

Hi Debbie,

This is related to the molar heat capacity of the inert gas. The larger the molar heat capacity, the greater the inerting effect. Argon has a smaller molar heat capacity compared to nitrogen, so a lower concentration of H2 in argon would support flame propagation. ISO 10156 is a good reference for this.

Best,

Whitney

_______________________________
Whitney Hess, PhD

EHS Coordinator
Microsystems Technology Laboratories
MIT, Room 39-213
Phone: 617-253-8567

Email: wrhess**At_Symbol_Here**mit.edu

---

From: ACS Division of Chemical Health and Safety [DCHAS-L**At_Symbol_Here**PRINCETON.EDU] on behalf of Debbie M. Decker [dmdecker**At_Symbol_Here**UCDAVIS.EDU]
Sent: Tuesday, June 05, 2018 7:34 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] 4% vs. 5% hydrogen

Hi all:

Riddle me this - why is 5% hydrogen in nitrogen considered NOT flammable and 4% in argon considered flammable? Tried to reach Praxair but no one is home.

This makes absolutely no sense to me.

Thanks,

Debbie

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."

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