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thoughts on laboratory lattice
I still have some used 1/2" Al lattice rod and connectors. I have sold most for 1/2 to 1/4 than th ...
13-8-2018 at 09:36
by: Dr.Bob
Is an automatic transfer pipette useful - which one ?
The Eppendorf repeater is positive displacement, so it handles low bp solvents much better. I hav ...
1-8-2018 at 16:43
by: Dr.Bob
Catalytic hydrogenation - preparation of hydrogen in situ
Pd on carbon is sometimes made by coating the carbon with PdCl2 and then reducing in situ, so not ha ...
1-8-2018 at 16:38
by: Dr.Bob
Is an automatic transfer pipette useful - which one ?
If you can find a used Gilson Pipetteman (not a cheap rip off) for a good price, it might be worth i ...
31-7-2018 at 17:30
by: Dr.Bob
Increasing water pump pressure using 2 pumps in series?
[rquote=525793&tid=85787&author=wg48temp]
Say you are gravity filtering a liquid and the in ...
30-7-2018 at 17:25
by: Dr.Bob
Conversion of Acetone to a Gasoline Alternative
[rquote=524775&tid=85118&author=Melgar]Just my take on it though, I could easily be wrong.[/ ...
26-7-2018 at 09:25
by: Dr.Bob
Sealing ground glass - Glindemann rings (PTFE) vs sleeves vs grease?
I have not used his PTFE rings, but tried many PTFE sleeves. Most are too thick and don't seal wel ...
24-7-2018 at 17:01
by: Dr.Bob
How do you clean stubbornly dirty glassware when no solvent seems to work?
I like a base bath for stubborn stains. Just dump 4-8 ounces of NaOH per gallon of EtOH, let disso ...
21-7-2018 at 04:34
by: Dr.Bob
replacement of diethyl ether
THF works pretty well in most cases, and using salt (brine) can lower its solubility in water. A mi ...
10-7-2018 at 10:57
by: Dr.Bob
Relocating labs ? Any experiences?
It is illegal to ship almost any hazmats via the US Mail. They are very picky and it is a federal ...
25-6-2018 at 07:26
by: Dr.Bob
Inspecting and destressing glassware
The number of times I have used glassware above 200 C is pretty rare. There have been a few times, ...
23-6-2018 at 06:15
by: Dr.Bob
Inspecting and destressing glassware
[rquote=522535&tid=84361&author=coppercone]Dr bob, really the internal stresses go away over ...
22-6-2018 at 06:20
by: Dr.Bob
Inspecting and destressing glassware
I have used lab glass for 30 years and you are likely worrying too much unless you are doing actual ...
21-6-2018 at 12:43
by: Dr.Bob
Phenylpiperazine Formation From Aniline
Most commercial aryl piperazines are made via Ullman or Buchwald chemistry now. Those are the simp ...
19-6-2018 at 16:45
by: Dr.Bob
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
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