Talk:Chloromethane

Water treatment
Is'nt chloromethane now used in place of chlorine in municipal water, as in Los Angleles DWP? —Preceding unsigned comment added by 12.52.198.89 (talk) 21:24, 23 October 2010 (UTC)
 * That's highly unlikely. I think you are mistaken.  ChemNerd (talk) 15:40, 21 May 2015 (UTC)

Density
Density given is for the liquid. Methyl chloride is a gas at stp so density should be 2.3 kg/m3 (reference: Perry's). 88.96.247.172 (talk) 09:49, 14 September 2012 (UTC)

Cocoanut Grove
At this time the article includes a statement to the effect that a 1997 investigation concluded chloromethane used as refrigerant R40 was a major cause of the 1942 fire. That statement appears to lack a verifiable factual basis and should probably be removed from this article.

The 1997 investigation appears to be summarized in a 1997 report from a consultant that enumerates and explores several scenarios that the concluding statements deny. (A citation was added to the Wikipedia article) The numbered concluding statements of section C begin by affirming that there are many ways for flammable gas to escape and burn, and end by noting that there was no way for the gas to get to where the fire started. The report's tone suggests that the consultant knew the client sought to support the hypothesis and contradicts it obtusely to preserve some chance of prompt, full payment of the consultant's fee. Apparently this is sufficiently obtuse for casual readers to misinterpret the subject of the investigation as its conclusion.

A search for an alternate source that may have been confused with the 1997 report found an article published in the May 2000 NFPA Journal. That article speculates provocatively on a role for chloromethane, but fails to advance a cogent theory. The factual basis is an observation in the 1942 fire investigation report that refrigeration pipe joints in an adjoining equipment room had separated. The 1942 report concluded that this had occurred due to the heat of the fire, and affirmed the eyewitness accounts of the fire starting at the ceiling on or near an artificial palm tree and spreading rapidly on the ceiling. The 1942 report noted the air conditioning and refrigeration equipment was in an adjoining room behind a solid wall and reported it to be using a non-flammable Freon. The 1942 report did not note damage in that equipment room consistent with ignition or combustion of flammable gas. The 2000 article hypothesized that due to wartime shortages flammable R40 might have been substituted for Freon, and that the 1942 investigators were unaware of it because those responsible had enlisted and were not interviewed. The 2000 article did not speculate how the heavy gas chloromethane could have passed through the wall to the nightclub, collected at the ceiling, ignited, and burned along the ceiling, etc. — Preceding unsigned comment added by PolychromePlatypus (talk • contribs) 15:13, 20 May 2015 (UTC)

Paint strippers
Methyl chloride and methyl alcohol are the principle ingredients of commercially available paint strippers such as Jasco and Kleenstrip. These are available from consumer outlets such as Home Depot. These are wicked concoctions mandating thick rubber gloves and eye protection since they are very strong skin irritants. --108.231.72.219 (talk) 03:46, 21 May 2015 (UTC)
 * Methyl chloride is a gas and is therefore highly unlikely to be used in such products. Perhaps you are confused with dichloromethane which is an ingredient in some paint strippers.  ChemNerd (talk) 15:40, 21 May 2015 (UTC)
 * Also known, maybe more commonly, as methylene chloride. Gah4 (talk) 15:26, 2 March 2020 (UTC)
 * Also known, maybe more commonly, as methylene chloride. Gah4 (talk) 15:26, 2 March 2020 (UTC)

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Freon-40
Why is there a graphic depicting Freon-40 in this article? Is there a connection that needs to be made, or is a correction needed? Theneedforsneed (talk) 22:35, 14 June 2020 (UTC)
 * There is a numbering system that DuPont uses for naming their halogenated refrigerants. Freon is the trademark that they use. Some people have extended the numbering system to compounds that DuPont doesn't use it for. As well as I know, there is no Freon-40 from DuPont. I suppose they (or Chemours) should sue for trademark infringement, but that isn't our problem. Actually, I am not sure about the use of trademarks in WP, and the possibility of infringement. In any case, I am not against removing it. Gah4 (talk) 04:35, 15 June 2020 (UTC)
 * There is a numbering system that DuPont uses for naming their halogenated refrigerants. Freon is the trademark that they use. Some people have extended the numbering system to compounds that DuPont doesn't use it for. As well as I know, there is no Freon-40 from DuPont. I suppose they (or Chemours) should sue for trademark infringement, but that isn't our problem. Actually, I am not sure about the use of trademarks in WP, and the possibility of infringement. In any case, I am not against removing it. Gah4 (talk) 04:35, 15 June 2020 (UTC)