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Refinery
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Anti bike theft agent
https://www.youtube.com/watch?v=ixPFDFp8Cfo
I was wondering if an U lock could be fitted with a metal tube that is hermetically sealed and filled with gas that is highly irritant but possibly
not toxic so that if the lock is being cutted with bolt cutters or angle grinder, the ampoule would burst and force the thief to retract. The nature
of the irritant could be anything from common pepper spray agents to a more effective solution, preferably a system that is pressurized so the
contents will release at once when cut for full effect. A dye agent could also be included to cause semi-permanent marking for the perpetrator to
allow for later identification. A clear marking or branding of the device would act itself as a deterrent.
Another factor regarding to the design of the lock presented in the video above, the bulk can be made out of material that causes intense smoke when
cut with angle grinder. This concept is used in safes against torches.
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clearly_not_atara
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The problem with this idea is that there are legitimate situations in which it would be appropriate to cut a bike lock. As such toxic or noxious
materials are not a good plan.
With that said, I think that the most practical choice is superglue. It should destroy an angle grinder on contact with minimal risk to human life. A
similar choice would be gallium.
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Deathunter88
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Where did you get that gallium or superglue would stop an angle grinder at all? Seems unlikely to me.
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zwt2
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Pottery-grade manganese dioxide. It'll hamper cutting and leave stains like a dye pack.
Manganese can be toxic, but if you're cutting steel, you'll be exposed to several transition metals in dust form anyway.
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mackolol
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The best option, but rather theoretical is chloroacetone readily made from three reagents in simple synthesis in situ, but due to big toxicity and
being not legal at all not to be use like that. Speaking about dye agent just paint it, but it would be only visible on hands.
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B(a)P
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Something similar to what the banks use would work well. Not chemistry related, but there are some good anti theft GPS based products on the market
for bikes.
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karlos³
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I guess you would have to pay in the end when the thief sues you, that is nowadays nothing unheard of in many countries.
Of course I could imagine it being filled with a bromoketone very well... but thanks to the monopol of violent force, under which an attack with a
chemical agent surely fells, you would definitely be sued, especially in case innocent bystanders(i.e. the thieves friends) are affected, your
punishment would surely turn out harder than anyones else involved.
I would even guess that the bike thief won't be punished, as any thoroughly ideologised judge would deem him the victim in such a case.
If you can pull that off without getting caught, why not though.
Then I would recommend bromoacetophenone, easily made, not at all wiped away, and it doesn't need to be pressurised... it is enough if the thief get
it on his hands(its a weak blister agent though, add that to being possibly sued), but its not a gas.
He'll wipe them somewhere on himself(not possible without solvents), and he will feel the burn shortly afterwards.
If he even makes it on the bike, he will get maybe five meters away, and when you get back to your bike, you should probably call an ambulance because
of the crying and whimpering thief(and then get the hell away before they get there).
It sounds pretty cruel though.
I wouldn't do this myself.
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Chemetix
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Lol, a vial of TiCl4 would be fun to try, reasonably harmless. But there are situations where that could be inappropriate, like a busy street with car
traffic getting covered in thick white smoke.
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G-Coupled
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Fill your tyres with Mercury Fulminate when you lock your bike up.
[Edited on 30-5-2020 by G-Coupled]
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XeonTheMGPony
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Theifs deserve what ever they get, I'd be happy with Tabum!
50K of irreplaceable equipment stolen and my bike! they need to suffer greatly!
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Chemetix
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Since we've descended into comically exotic ways to murder thieves, there's cacodyl, a spontaneously flammable liquid in air. If the burns don't kill
them, the cloud of arsenic will finish the job. Arsine or phosphine could be substituted here, but you'll probably kill yourself trying to make this
anti theft device.
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SWIM
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You just need a depleted uranium hasp for that lock.
Anybody tries to use a grinder on that it's going to look like the fourth of July (Cinco de Mayo? Guy Fawkes day?...lots of fireworks is the idea.)
And if the sparks don't give the thief away the the uranium contamination should make for a short career anyway.
Pretty toxic, even as a chemical agent.
On a more serious note, a thicker hasp might be engineered with large internal differences in hardness so that any saw, drill, or perhaps even grinder
disc, encounters heavy stresses that will break it.
This was done for some safes back in the early 20th century. I think they cast some softer metal with a framework of something much harder inside. It
worked well against drills and saws- at least pre-WWII drills and saws- but I'm not sure it would defeat a grinder.
How about a thick steel tube for a hasp with notches like a flute cut in it so it whistles out a distress call when you put a grinder to it and it
warms up?
The Vocal Memnon Bike lock.
Now available at S-Mart.
Shop smart, shop S-Mart.
@XEON below: Yeah, I forgot about that move. Some guys were doing that in Palo Alto for a while too.
They had a flat-bed truck and they'd take racks with a dozen or more bikes chained to them.
[Edited on 30-5-2020 by SWIM]
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XeonTheMGPony
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if the lock is hard they just grind off the bolts on the bike holder and take the whole thing in my parts
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mackolol
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Quote: Originally posted by Chemetix  | Lol, a vial of TiCl4 would be fun to try, reasonably harmless. But there are situations where that could be inappropriate, like a busy street with car
traffic getting covered in thick white smoke.
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Reasonably harmless!? Isn't it maybe burning your skin and lungs as well as eyes and covering them in oxide?
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karlos³
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| Quote: Originally posted by mackolol | | Quote: Originally posted by Chemetix | Lol, a vial of TiCl4 would be fun to try, reasonably harmless. But there are situations where that could be inappropriate, like a busy street with car
traffic getting covered in thick white smoke.
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Reasonably harmless!? Isn't it maybe burning your skin and lungs as well as eyes and covering them in oxide? |
Well yes, it actually is.
Don't go full chemophobia with this, you wouldn't call muriatic acid out for burning your lungs, skin, eyes, either, no?
Its not bad because the fumes are obnoxious and repulsive and anybody will retreat from the area in such a case.
I'll give you an example: during my back then still mandatory basic training in the military, a few months less than a year, most of us got exposed to
the stuff, in quite sizeable quantities even.
Not only once as well!
They haven't even told us about the stuff and its dangers, I guess it just wasn't that seriously harmless in their judgement(connected with eventual
legal problems though if someone gets affected badly).
Only found that out a few years ago on accident what this "smoke" consists of.
I've always assumed it was some other fuming metal chloride, or PCl3 instead.
The reason to get exposed to this stuff was by the way its use in the so-called "smoke/fog throwers", which are used to generate thick and dense fumes
and clouds to hide vehicles or such behind.
Those things are as far as I know loaded with only TiCl4, and the generates fumes are really biting, smelly, suffocating and generally unpleasant.
You are told to avoid the clouds, but well, you will do that anyway when you get to close and smell and breathe that accidentally in.
And guess what? Nobody died, actually not even one got hurt.
Its just not as bad as it sounds, and I mean, isn't it like this for every chemical?
When you read all the descriptions of its possible dangers, what it can do in the worst case, etc, etc....
I know so many who sound really harmful just from their warning labels, for example triethylamine sounds bad, causing chemical burns in your lungs,
together with coughing bloody sputum out, etc... sounded quite scary and a friend who read that was quite shocked.
Everyone who worked with triethylamine knows it is a pretty tame chemical which isn't problematic to handle at all.
Luckily I read that only after I worked the first times with it, I only remember that because of the visibly horrified friend, who looked like his
worst fear in that moment was me opening the bottle with it... 
I simply wouldn't go after the description only, yes it is helpful and yes it should definitely be read, but you have to keep in mind they have to
list completely every possible risk, without paying attention to the likelyhood of these risks.
Its for legal purposes, so it is actually more like some sort of scary sounding bureaucracy.
*Disclaimer: I can't actually say if it was really TiCl4 in those smoke thrower things, nobody told us.
But TiCl4 is the most widely used agent for this purpose here, so I am like 80-90% sure that I am correct with my guess.
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brubei
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cover the bike with COVID or AIDS
I'm French so excuse my language
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Herr Haber
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@karlos: those things used to be hexachloroethane and zinc most of the time.
Google "HC Smoke"
Zinc AND Hcl to breathe for the infantry when the tanks pops them.
Though effective they were / are being changed for that reason.
Clearly not atara's suggestions are good ! A friend working historical buildings as a stone mason told me what happens when you use an angle grinder
on lead. I can imagine your solution being as effective at least.
The spirit of adventure was upon me. Having nitric acid and copper, I had only to learn what the words 'act upon' meant. - Ira Remsen
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lavenatti
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If you fill your sealed tube with butyl mercaptan you'd certainly end up with a youtube worthy video when a thief cut through it.
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Tsjerk
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| Quote: Originally posted by lavenatti | | If you fill your sealed tube with butyl mercaptan you'd certainly end up with a youtube worthy video when a thief cut through it.
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That stuff smells so bad I'm sure you will stink your place up and there will be a smell around the bike for at least the first couple of weeks...
Which will probably help against theft, but there is little to steal when the fire squad takes the bike first...
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yobbo II
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Electric shock device?
Yob
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Sulaiman
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fill the tube with compressed air, CO2 etc. and some talcum powder,
put a notice like:
"You may have been poisoned, please telephone xxxxxxxxx within 90 minutes to return my bicycle and purchase the antidote"
CAUTION : Hobby Chemist, not Professional or even Amateur
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mackolol
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| Quote: Originally posted by karlos³ |
Don't go full chemophobia with this, you wouldn't call muriatic acid out for burning your lungs, skin, eyes, either, no?
Its not bad because the fumes are obnoxious and repulsive and anybody will retreat from the area in such a case.
Its just not as bad as it sounds, and I mean, isn't it like this for every chemical?
When you read all the descriptions of its possible dangers, what it can do in the worst case, etc, etc....
I know so many who sound really harmful just from their warning labels, for example triethylamine sounds bad, causing chemical burns in your lungs,
together with coughing bloody sputum out, etc... sounded quite scary and a friend who read that was quite shocked.
Everyone who worked with triethylamine knows it is a pretty tame chemical which isn't problematic to handle at all.
I simply wouldn't go after the description only, yes it is helpful and yes it should definitely be read, but you have to keep in mind they have to
list completely every possible risk, without paying attention to the likelyhood of these risks.
Its for legal purposes, so it is actually more like some sort of scary sounding bureaucracy.
|
Okay... maybe I overreacted it, but I just got pissed when I have read that it is harmless. In considered situation, even though it isn't even likely,
one wouldn't know that he is exposed to anything dangerous. If he breathed lungful of it, it would be a problem.
Thank you for sharing your experience about such chemical. When I was making smoke grenades from hexachloroethane and Al, I avoided the fumes as I
didn't want to be exposed to something I knew about.
It is also something new for me that TEA can induce blood coughing, even though if I thought about it, I would probably invent that excessive
inhalation would cause such problems.
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mackolol
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I think that good option for bike theft agent would be something very stinky. Maybe thioacetone, but due to polymerisation and excessively spreading
smell it would be hard to spot the thief.
I would probs go for cadaverine, putrescine or maybe some very impure amphetamine (the thief would have problems as it is illegal and well known for
police smell, at least in Poland which has biggest amphetamine production in the Europe).
Some chemical that stinks very much and can help to spot the thief but is harmless.
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Refinery
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tert-Butyl Isocyanide it is, then.
If there is something that causes emergency evacuation of public places due to incapacitating odor, this thing comes handy.
It doesn't matter if the thief gets away, they will kick them out of every town.
I don't know what amphetamine smells like? Is it easily detectable, strong odor? Does pure/purified and dried amphetamine smell as well?
[Edited on 11-6-2020 by Refinery]
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andy1988
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| Quote: Originally posted by Herr Haber | @karlos: those things used to be hexachloroethane and zinc most of the time.
Google "HC Smoke"
Zinc AND Hcl to breathe for the infantry when the tanks pops them.
Though effective they were / are being changed for that reason. |
Recent article on non-toxic, or lower toxicity smoke alternative, the coloured smokes look dull, easter coloured:
| Quote: | The reaction between the basic component of the conventional formulation (potassium chlorate) and the organic substances that provide the colors gives
rise to polychlorinated compounds that are carcinogenic.
Furthermore, mixtures based on hexachloroethane are often used to generate white smoke—and their combustion leads to the formation of toxic
by-products such as hexachlorobenzene, hexachlorobutadiene, chlorinated dibenzofurans and dibenzodioxins. In the new formulation developed by
Klapötke and his colleagues, potassium chlorate is replaced by the non-toxic nitrogen-rich salt guanidinium-5,5'-azotetrazolate, which is combined
with several organic dyes as coloring agents. |
Abstract:
| Quote: | | In this study, a progressive halogen‐free multi‐colored smoke system to obtain white, red, violet, yellow, green and blue smoke color impression
is presented. In detail, the nitrogen‐rich salt guanidinium 5,5’‐azotetrazolate (GZT), which is usually applied as gas generator or propellant
ingredient, was combined with different smoke dyes (Solvent Red 1, Solvent Violet 47, Solvent Green 3, Solvent Yellow 33). These two‐component smoke
mixtures offer a convenient and safe multi‐color approach without any need of hazardous material. The author’s determined common smoke
characteristics with respect to burn time / burn rate, yield factor, transfer rate as well as energetic properties and compared them with classic
chlorate‐based in‐use formulations. To the best of our knowledge, nothing comparable is known in the literature. Therefore, nitrogen‐rich
compounds as only ingredient in smoke mixtures open a completely new research area in modern pyrotechnics. |
In the paper's conclusion on “nitrogen-rich-only” smokes:
| Quote: | | However, also the toxicity of these combustion products should be further evaluated to satisfy health aspects. |
[Edited on 13-6-2020 by andy1988]
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