I gotta be honest, I never heard the use of 'DCM' to refer to dichloromethane until about 7 years into my chemistry career. I know, that's weird. I'm a little freaked out myself.
DCM and chloroform have this thing - they are both irritating on their own but the problem gets far, far worse if they contain traces of HCl: because that acid - diluted as it might be - soaks right into your skin. You may want to treat it as organic acid burn, with neat ethanolamine for half a minute then wash away thoroughly, the hurt should go away promptly.
Dont try old chloroform sprinkle into your eyes - it is one of the most painful things I experienced (and you cannot use ethanolamine there)
Also, anhydrous HCl in dioxane is extremely unpleasant on your hands.
Maybe you should check what kind of DCM grade you are using - try it on wet pH paper, to see if it goes pink. Since we started using olefin-stabilised DCM, HPLC grade, we rarely have the "caustic DCM" problem anymore.
it butns under the ring because it cannot evaporate there as easily - so the exposure is longer and in fact the acid will concentrate there. You can get the same "enhanced burning" if you dip your shirt sleeve in it
Milkshake: Thanks. That makes sense. As for the grade, my most recent use was for stripping the varnish off a table. The small drop of varnish remover I got on my arm was very painful. I'm sure this is the lowest grade available, not to mention the other stuff mixed with it.
Eschew acronymns and non-informative common names in the lab. Confusion is the rock under which the troll of danger lurks.
No, it MUST be called lovingly by its full name:
Dichloro-Meethane (trained by ex-patriot Brits, spent time in the UK).
As for why it hurts I don't know but I do know that it's the only solvent I've found that will efficiently strip silicon grease off a ground glass joint.
Although think milkshake is correct about possible traces of HCl I thought DCM "dehydrates" skin as absorbs into fats/proteins repelling H2O and breaking up tissue structure thus triggering nerve responses.
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I tend to call it DCM, but I have a special love for acronyms.
ReplyDeleteWhenever I've spilled it on myself I always get a blistery rash, which makes me think I have a sensitivity to it.
DCM!
ReplyDeleteI've always wondered that too. Hopefully someone out there knows.
So far 100% DCM.
ReplyDeleteI gotta be honest, I never heard the use of 'DCM' to refer to dichloromethane until about 7 years into my chemistry career. I know, that's weird. I'm a little freaked out myself.
DCM and chloroform have this thing - they are both irritating on their own but the problem gets far, far worse if they contain traces of HCl: because that acid - diluted as it might be - soaks right into your skin. You may want to treat it as organic acid burn, with neat ethanolamine for half a minute then wash away thoroughly, the hurt should go away promptly.
ReplyDeleteDont try old chloroform sprinkle into your eyes - it is one of the most painful things I experienced (and you cannot use ethanolamine there)
Also, anhydrous HCl in dioxane is extremely unpleasant on your hands.
Maybe you should check what kind of DCM grade you are using - try it on wet pH paper, to see if it goes pink. Since we started using olefin-stabilised DCM, HPLC grade, we rarely have the "caustic DCM" problem anymore.
I didn't start calling it DCM until I got into industry and surrounded by other lazy chemists.
ReplyDeleteUp through and including grad school, it was methylene chloride.
I've never understood as to why it burns so badly under the ring. Maybe Sauron blew up and became DCM, and he's trying to get it back.
Leave it to me to LOTR-ize a perfectly fine chemistry post. :D
it butns under the ring because it cannot evaporate there as easily - so the exposure is longer and in fact the acid will concentrate there. You can get the same "enhanced burning" if you dip your shirt sleeve in it
ReplyDeleteI guess that explains why it hurts more when you let it soak through the gloves.
ReplyDeleteBy the way...nitrile gloves don't stop it.
Milkshake: Thanks. That makes sense. As for the grade, my most recent use was for stripping the varnish off a table. The small drop of varnish remover I got on my arm was very painful. I'm sure this is the lowest grade available, not to mention the other stuff mixed with it.
ReplyDeleteMatt: LOTR-ize anytime.
Eschew acronymns and non-informative common names in the lab. Confusion is the rock under which the troll of danger lurks.
ReplyDeleteNo, it MUST be called lovingly by its full name:
Dichloro-Meethane (trained by ex-patriot Brits, spent time in the UK).
As for why it hurts I don't know but I do know that it's the only solvent I've found that will efficiently strip silicon grease off a ground glass joint.
"Meethane"
ReplyDeleteI have always loved that pronunciation.
Although think milkshake is correct about possible traces of HCl I thought DCM "dehydrates" skin as absorbs into fats/proteins repelling H2O and breaking up tissue structure thus triggering nerve responses.
ReplyDeleteGet a Brit to "ligand".
I don't know if anonymous is right or not, but it certainly sounds more painful.
ReplyDeleteTime to do an experiment. HPLC-grade DCM vs. varnish-stripper-grade DCM.
I need someone's arm.
I've always wondered and now I am asking the world: Why does methylene chloride hurt when I get it on my skin? It's especially bad under a ring
ReplyDeleteI would not purchase DCM from Belgium. I heard it is more painful that the one made in U.S.A. :-)
ReplyDeleteWhat's Belgium?
ReplyDeleteEspecially not the belgian stripper grade - I traveled to Lutich once...
ReplyDeleteIf you've gotten enough on your skin to burn, you've definitely gotten enough into your system to be trashing your liver.
ReplyDeleteThe skin burn would be the least of my worries...ever heard of angiocarcinoma?
And ethanolamine to treat a burn? My gawd you organic chemists are nuts. How about NaHCO3, it's only a heck of lot safer and cheaper...
i like Belgian strippers!
ReplyDeleteHi There,
ReplyDeleteThank you for sharing the knowledgeable blog with us I hope that you will post many more blog with us:-
Buy Methylene Chloride quality products, excellent customer service and competitive prices, is the ideal choice for all your chemicals online
Contact US
Number: +1 (612) 208-7112
E-mail: info@researchchemicalshops.com
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