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What are the hard white rubber stoppers made of ?
Those are just butyl rubber, or natural rubber, likely with many additives. The red rubber is basic ...
18-6-2018 at 12:26
by: Dr.Bob
FREE chemicals
That is awesome. I would go get the isopropanol, sodium hydroxide and other inorganics, then repack ...
14-6-2018 at 04:27
by: Dr.Bob
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Usually BuLi is added slowly, over many minutes. Often at low temps, so that seems unusual to go q ...
12-6-2018 at 15:42
by: Dr.Bob
Are there chinese hotplates & heating mantles as good as others but significantly cheaper?
I can agree that some Chinese glassware is fine. But having used some Chinese electronics, I would ...
11-6-2018 at 17:37
by: Dr.Bob
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Did they not cool the reaction before adding the BuLi? That is pretty standard to avoid spikes in ...
10-6-2018 at 13:58
by: Dr.Bob
temp probes for thermoSci and IKA hotplates
Why, are you busy this time of year? ;-)

I have a photo of a few of the thermocouples and some ...
6-6-2018 at 05:38
by: Dr.Bob
temp probes for thermoSci and IKA hotplates
I have lots of various thermocouples also, including some long Teflon ones, and many other varieties ...
5-6-2018 at 09:26
by: Dr.Bob
Is there a solvent I can use to wash my vacuum pump oil reservoir?
DCM will kill the gaskets, seals, and metal in pumps, so don't let that get into the pump if possibl ...
30-5-2018 at 17:55
by: Dr.Bob
Science equipment looking for a home
Here is an updated copy of the inventory. I have a hard time keeping it updated, but I am trying. ...
29-5-2018 at 18:00
by: Dr.Bob
Is there a solvent I can use to wash my vacuum pump oil reservoir?
The biggest issue with doing that is any solvent left in the pump can wreck it when you restart it. ...
29-5-2018 at 12:56
by: Dr.Bob
Good sources of cerium
Ceric Ammonium Nitrate is used in many labs, that would be my first thing to try to find a sample of ...
27-5-2018 at 18:19
by: Dr.Bob
Synthesis of Hexane from Cellulose/Glucose
I worked in biofuels for a short time. This (conversion of cellulose to anything useful) type of w ...
22-5-2018 at 17:59
by: Dr.Bob
3-acetylindole
Might be better to protect the indole NH with a alkylprotecting group, like benzyl. But even with a ...
15-5-2018 at 03:37
by: Dr.Bob
Is this kit any good?
For the price, it is hard to go wrong, as I sell used 24/40 kits for more than that. The Chinese go ...
14-5-2018 at 11:22
by: Dr.Bob
Oxalyl Chloride Challenge
Did you simply chlorinate the solvent TCE to add Cl across the double bond? Not sure how easy that ...
14-5-2018 at 11:14
by: Dr.Bob
What's the most expensive substance you've bought?
Had to use a gold catalyst (AuCl3) once, back in grad school, when gold was a bit cheaper, but still ...
8-5-2018 at 12:58
by: Dr.Bob
How should I choose glass joint size?
small, cond is 34/45
med, cond is 45/50
large, cond is 55/50
7-5-2018 at 16:24
by: Dr.Bob
How should I choose glass joint size?
[rquote=516964&tid=81955&author=fusso]So I think I also need a soxhlet extractor for extract ...
7-5-2018 at 10:37
by: Dr.Bob
Buchner funnel: glass or ceramic?
[rquote=517029&tid=82545&author=Sulaiman]I use 90mm filter papers and a porcelain Buchner fu ...
7-5-2018 at 10:26
by: Dr.Bob
Do this kind of pumps exist?
There are simple syringe pumps that can push and pull, with the right valves, you can move small vol ...
3-5-2018 at 17:47
by: Dr.Bob
possible free ethanol sample
[rquote=516551&tid=82350&author=Hegi][rquote=516381&tid=82350&author=VSEPR_VOID]They ...
3-5-2018 at 11:47
by: Dr.Bob
The Sciencemadness TLC Apparatus Challenge
I am remembering when we used to make our own TLC spotters in the undergraduate research lab by heat ...
2-5-2018 at 09:10
by: Dr.Bob
ozonolysis alkene->aldehyde, used in industry?
I used to run ozonolysis reactions in industry all of the time. They liked them because the reagen ...
30-4-2018 at 17:17
by: Dr.Bob
possible free ethanol sample
They sell a mixture of ethanol and n-heptane (as the denaturing agent). They likely distill off tog ...
30-4-2018 at 12:59
by: Dr.Bob
Well time to start making SO3 and Bromine! (Ampoules)
Having tried to seal ampules before, I can say that sealing small ones is hard, 5-10 ml is harder, a ...
29-4-2018 at 17:56
by: Dr.Bob
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