Subject: Re: [DCHAS-L] 4% vs. 5% hydrogen
Date: Fri, 8 Jun 2018 07:19:17 -0600
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 002f01d3ff2b$4eafff70$ec0ffe50$**At_Symbol_Here**



Did these determination come from Safety Data Sheets?

Are these DOT hazard classes for the gases?

Unfortunately, SDS’s can be very unreliable.



Ron Harvey

Echelon Environmental






From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Debbie M. Decker
Sent: Tuesday, June 5, 2018 5:34 PM
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.





Debbie M. Decker, CCHO, ACS Fellow

Past Chair, Division of Chemical Health and Safety

Councilor and Programming Co-Chair

University of California, Davis





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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