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Tunicate posted:Brian Blessed taught Keanu Reeves how to meditate. woah
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May 3, 2016 07:05
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Pile of Kittens posted:The one time I needed to use MEK I just skipped the triple bagging and used it bare-handed and extremely quickly. I probably have cancer of the hands now, but I got that resin out of the sink, god drat it. My ex-wife's grandfather contracted some kind of bone cancer which killed him within eight months of his noticing something was wrong and getting it diagnosed. He also maintained a smallish olive grove and insisted on mixing and otherwise working with the pesticides without gloves or any other kind of PPE. Dude's fingernails were all kinds of hosed up all of the time, and while that poo poo wasn't poisoning him obviously and immediately, bone cancer which goes systemic inside of a year probably didn't just come from nowhere. Also he was the frothiest and most smugly entitled kind of rank-and-file neocon, refusing to use pansy-rear end safety equipment because he's a Real Man fits entirely with the rest of his attitudes. What a maroon.
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May 3, 2016 07:29
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MEK is fantastic for glueing HIPS. What's MC in this context?
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May 3, 2016 11:54
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I took it as methylene chloride aka dichloromethane, but if theres another meaning please post.
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May 3, 2016 15:59
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As a chemical engineering undergrad I had to design a process plant that produced various chloromethanes. Can someone summarise just how bad tetrachloromethane is? I know it's real bad, but we never got much past "just recycle as much of it as possible back into chloro/dichloromethane  " 
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May 3, 2016 17:06
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Firos posted:As a chemical engineering undergrad I had to design a process plant that produced various chloromethanes. Can someone summarise just how bad tetrachloromethane is? I know it's real bad, but we never got much past "just recycle as much of it as possible back into chloro/dichloromethane What kind of people say "tetrachloromethane" instead of "carbon tetrachloride"?
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May 3, 2016 17:41
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IUPAC shills.
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May 3, 2016 17:45
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It makes it easier when you're referring to di/tri/tetrachloro hundreds of times in the same document 
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May 3, 2016 17:48
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Carbon tet is a CNS depressant like most other halogenated low MW organics so exposure can get you acting loopy and putting yourself in risks you might not normally. Chronic exposure is alarmingly stressful on kidneys and the liver and in the atmosphere it acts as a fairly potent ozone destroyer. Its not one of those comically mutagenic cancer starting chemicals someone was talking about a few pages ago, but its nasty enough stuff to make waves on risk assessments when you need to deal with the stuff.
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May 3, 2016 18:02
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Not as exciting as I'd hope ( ), but then again no one really uses chlorinated methanes for much anymore. Which was part of the reason why the plant we designed was almost assuredly going to operate at a loss lol.
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May 3, 2016 18:42
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For the adventurous among you, you can make chloroform at home from sodium hypochlorite (bleach) and acetone (nail polish remover). It's a rather exothermic reaction and you'll probably want to distill it afterward. Chloroform slowly oxidizes into phosgene which was used as a chemical weapon in WW1, so be sure to huff it fast.
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May 3, 2016 19:05
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zedprime posted:Carbon tet is a CNS depressant like most other halogenated low MW organics so exposure can get you acting loopy and putting yourself in risks you might not normally. Chronic exposure is alarmingly stressful on kidneys and the liver and in the atmosphere it acts as a fairly potent ozone destroyer. Its not one of those comically mutagenic cancer starting chemicals someone was talking about a few pages ago, but its nasty enough stuff to make waves on risk assessments when you need to deal with the stuff.
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May 3, 2016 21:29
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Makes phosgene/carbonyl fluoride is kind of the default combustion state for halogenated organics up to and including most of the polymers that make the modern world go 'round. I think Halon 1211 even comes with the disclaimer that you'll end up with HF and HBr at some point. Its often mitigated by the fact that if you are in a situation to be huffing combustion products you're fairly screwed already. Man, $5 is a hell of a deal for all that delicious anaesthetic that is only Might be apocryphal but I remember the prof mentioning during the halogenated organics unit about at the birth of anesthesia there were a number of patent anesthetics trying to distinguish themselves from purer chloroform anesthetics with the addition of carbon tet.
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May 3, 2016 22:19
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GWBBQ posted:It's pretty nasty on the liver and over 200°C it starts decomposing into phosgene. I bought an old fire extinguisher with the original liquid in it at a tag sale this weekend so I was double checking the safety sheets. It was $5 and not leaking, how could I lose? I thought most fire extinguishers used a dry chemical powder to smother flames? Or is this some fancy chem lab fire extinguisher?
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May 4, 2016 06:51
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Elmnt80 posted:I thought most fire extinguishers used a dry chemical powder to smother flames? Or is this some fancy chem lab fire extinguisher? Depends on the type of fire likely to happen. Chemical powders don't do well against self-oxidizing fires, for instance. The typical ABC extinguisher works by making a barrier between fuel and oxygen. Doesn't work well if the fuel is the oxidizer. Chlorine-containing fires turn into death too due it being an ammonium phosphate salt.
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May 4, 2016 06:57
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Elmnt80 posted:I thought most fire extinguishers used a dry chemical powder to smother flames? Or is this some fancy chem lab fire extinguisher? They do today, carbon tet fire extinguishers haven't been used in decades. You know, all that stuff about liver degredation and kidney failure, and how it turns to mustard gas when you heat it up. I honestly have no idea how to put out a fire where the combustion material provides its own oxygen. Memento has a new favorite as of 07:01 on May 4, 2016 |
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May 4, 2016 06:58
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Memento posted:I honestly have no idea how to put out a fire where the combustion material provides its own oxygen. You can try and use compressed gas as a coolant to bring it down below the ignition point. Or you can run away.
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May 4, 2016 07:04
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The Lone Badger posted:You can try and use compressed gas as a coolant to bring it down below the ignition point. Or you can run away. Yeah you can try and cool it with a massive heat sink or do the wise thing by using the fire safety tools attached to your knees.
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May 4, 2016 07:06
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Remember the fire triangle. Fuel-oxidiser-heat. Can't take away the fuel or oxidizer so you'll have to try to cool the fire to below ignition temperature. Water is actually good here as long as whatever's burning doesn't react with it. If that's not an option I guess you just try to prevent it from spreading and let it burn out.
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May 4, 2016 07:08
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If you need something cold why not just pour liquid oxygen on it
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May 4, 2016 07:40
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Pouring liquid helium/nitrogen on your fire might work as a way to displace oxidizer(assuming your ignition source isn't also functioning as its primary source of oxidizer)Moist von Lipwig posted:If you need something cold why not just pour liquid oxygen on it Get that tan you've always wanted, in 3 seconds or less!
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May 4, 2016 07:48
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Vitamins posted:I took it as methylene chloride aka dichloromethane, but if theres another meaning please post. You are correct. It's also called plastic weld if you go to a model shop. Its' icy cold touch when you accidentally inject it into a finger is pleasant reminder of my college days. If you don't hit a vein, it won't kill you, so that isn't too bad.
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May 4, 2016 15:20
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mostlygray posted:You are correct. It's also called plastic weld if you go to a model shop. Its' icy cold touch when you accidentally inject it into a finger is pleasant reminder of my college days. If you don't hit a vein, it won't kill you, so that isn't too bad. Humbrol Liquid Poly is butyl acetate AFAIK. It has a very pleasant fruity smell. Apparently it's also used as a flavoring, which is slightly disturbing.
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May 4, 2016 15:48
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KozmoNaut posted:Humbrol Liquid Poly is butyl acetate AFAIK. It's not entirely butyl acetate, they just use it as a solution to dilute the real solvent in it and of course it smells like fruit, many fruits produce butyl acetate.
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May 4, 2016 15:57
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Kwyndig posted:It's not entirely butyl acetate, they just use it as a solution to dilute the real solvent in it and of course it smells like fruit, many fruits produce butyl acetate. Nothing else is mentioned in the safety data sheet: http://www.technologysupplies.com/downloads/msds/SDS0162.pdf
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May 4, 2016 15:58
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Ahhh yes, the good old 60-100% of something, unmentioned 0-40% of ???????? style SDS.
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May 4, 2016 16:01
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That is like the third data sheet I have seen for that. Is there no standards in the UK?
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May 4, 2016 16:01
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KozmoNaut posted:Humbrol Liquid Poly is butyl acetate AFAIK. Spoiler alert: a lot of nice-smelling things are aldehydes and keytones. DID YOU KNOW THAT YOUR SO-CALLED "AMARETTO" IS LOADED WITH BENZALDEHYDE, HYDROXYETHANE (WHICH IS RELATED TO ETHYLENE, A VALUABLE FRACKING PRODUCT), AND THE DEADLY (2R,3R,4S,5S,6R)-2-[(2S,3S,4S,5R)-3,4-dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol WHICH HAS BEEN LINKED TO DIABETES????
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May 4, 2016 20:06
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Elmnt80 posted:I thought most fire extinguishers used a dry chemical powder to smother flames? Or is this some fancy chem lab fire extinguisher? 
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May 4, 2016 20:13
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Collateral Damage posted:Remember the fire triangle. Fuel-oxidiser-heat. I suggest running like hell
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May 4, 2016 20:41
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Relevant to chloromethane chat:
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May 4, 2016 22:24
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Bertrand Hustle posted:Jesus. I did a report on organophosphate poisoning for a medical terminology class last year, probably because of either this thread or the OSHA thread that spawned it. Fun fact: most nerve agents (Sarin, VB, etc; as far as I can tell from Wikipedia VX was specifically designed to kill people, but the previous ones were accidental) were discovered in the search for better insecticides. Also, VB was actually sold to the public for a brief time under the brand name Amiton. Munin posted:The reaction of Fluorine and Sulphur in one of their other videos is really rather beautiful: Pfft. How about fluorine and the one diagonally opposite it? With same guest, apparently he's the only guy in the UK working with fluorine. https://www.youtube.com/watch?v=TLOFaWdPxB0 It's actually kinda disappointing, once you get higher than magnesium in air it's just "welp, that's a hell of a white-hot flame," at least visually. I'd like to see graphs of the heat and non-visible EM radiation compared to those of magnesium burning in air, though.
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May 6, 2016 00:22
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Bad Angus! Bad!|
I imagine alot of detail is getting lost in the limited color range of the-current cameras. I'd love to see them redo those with modern HDR capabilities and see if there is a better picture.
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May 6, 2016 05:03
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I don't think there's really any cameras on earth with a good enough dynamic range to capture that properly, maybe with a shitload of neutral density filters.
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May 6, 2016 05:05
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Moist von Lipwig posted:I don't think there's really any cameras on earth with a good enough dynamic range to capture that properly, maybe with a shitload of neutral density filters. A girl can dream though 
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May 6, 2016 05:14
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May 6, 2016 05:16
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Moist von Lipwig posted:I don't think there's really any cameras on earth with a good enough dynamic range to capture that properly, maybe with a shitload of neutral density filters. Split it with pellicle mirrors, send it to multiple sensors with different numbers of neutral density filters in the path. Platystemon has a new favorite as of 06:51 on May 6, 2016 |
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May 6, 2016 05:40
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rapidly adjusting variable ND with multiple polarizers would work
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May 6, 2016 06:19
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atomicthumbs posted:rapidly adjusting variable ND with multiple polarizers would work That’s pretty clever. Now I’m wondering if anyone has built a camera on that principle. You might have to use something like a Geneva drive to avoid artefacts as the polarisation changes within a frame (well, sub‐frame. Field?). 
Platystemon has a new favorite as of 06:58 on May 6, 2016 |
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May 6, 2016 06:52
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The polarizing filters trick is actually exactly how the rapatronic camera worked, used for taking photos of atomic bombs going off in the 40s and 50s. It could take photos with a 10 nanosecond exposure time in order to avoid overexposure from the sheer light output of the bombs. And by overexposure I mean vaporizing the film, probably.
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May 7, 2016 02:16
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