We have a temporary exhibit on firefighting.  One of the artifacts is a
breakable "gas grenade" that contains CM-7 fluid, used to extinguish
fires.  We are aware that this substance is extremely dangerous and it
has been handled with a very high degree of caution.  But what is CM-7
fluid, exactly?  The donor identified it as carbon tetrachloride, but
that is apparently not correct.  One source identified it as azeotropic
chloromethane, also known as methyl chloride, but another source tells
me they are not the same because they have different CAS numbers.  This
is totally out of my field of expertise-they didn't cover it in my high
school chemistry class 35 years ago, so any response definitely needs to
be in layman's language. 

 

Kim Elmore

Outreach Coordinator

Gwinnett History Museum

Lawrenceville Female Seminary

455 South Perry Street

Lawrenceville, GA  30045

tel:  770.822.5178

email:  [log in to unmask]
<mailto:[log in to unmask]> 

web:  www.gwinnettparks.com

 


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