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Anyone want to swap chemistry stuff?
I still have some flasks, jointed glassware, and much more, mostly for sale, but might be willing to ...
13-11-2017 at 17:57
by: Dr.Bob
reuse of HDPE pesticide jugs
HDPE containers cost under a $1 each, just buy some new ones, any over a few years are a liability. ...
9-11-2017 at 19:13
by: Dr.Bob
A Pump capable of Pumping Exotic Fluids
A peristaltic pump with Chemflex (Gore) tubing will survive that, not much else will flex at -78C. ...
9-11-2017 at 19:09
by: Dr.Bob
Boron- Skylighter
Many of the boron reagents are used for making greens without barium. Not sure if all are, but tha ...
9-11-2017 at 19:05
by: Dr.Bob
Vigreux and reflux column combo. Custom piece
Might have allowed mixtures of solvents to be distilled, the higher boiling fractions went the lower ...
5-11-2017 at 16:48
by: Dr.Bob
Dean Stark Apparatus : Worth it?
I have lots of them used in virtually every glass joint size imaginable. (14/20, 24/40, 29/42, etc ...
2-11-2017 at 12:01
by: Dr.Bob
Air compressor powered vacuum pump
I agree with the above, it will require massive amounts of air, so unless you have a 20-30+ gallon c ...
1-11-2017 at 07:14
by: Dr.Bob
Reduced pressure distillation question and smoke?
You should allow the apparatus to cool before releasing the vacuum. The smoke was possibility from ...
30-10-2017 at 12:32
by: Dr.Bob
Help Getting a New Magnetic Stirrer
I think I still have some working used Corning hotplates in storage, I have been selling them for $1 ...
29-10-2017 at 14:17
by: Dr.Bob
Chemistry anylizer? -Siemens Dimension RxL Max
Many of these types of machines require a kit for each analysis, which makes them useless without th ...
25-10-2017 at 05:03
by: Dr.Bob
Explosions in movies
One of the EOD team nearby uses a block of C4 (on top of a piece of cardboard) with a plastic sack ( ...
16-10-2017 at 19:00
by: Dr.Bob
Boron- Skylighter
Sad to heat that they are closing, I know Harry was trying to sell the business, but likely no taker ...
16-10-2017 at 18:45
by: Dr.Bob
clearly marked pipettes
I have scads of pipettes in those sizes. Most are clearly marked in color, some are one volume, so ...
16-10-2017 at 18:37
by: Dr.Bob
Sources of choline chloride in Australia
Choline will be very soluble, and likely hygroscopic, so it may not ever form a nice solid. Just us ...
14-10-2017 at 05:12
by: Dr.Bob
Stabilizer for Cinnamaldehyde Storage
I would try to store in a amber glass bottle, and don't lead much head space, that way little air wi ...
14-10-2017 at 04:57
by: Dr.Bob
Degasser units HPLC (really needed??)
It also depends on what pressures you go to, if you have a fancy new system that goes to 5000 psi, t ...
11-10-2017 at 06:02
by: Dr.Bob
Fluorinating the benzene ring
A stated, the CF3- group is like a really large, but electron withdrawing alternate to a methyl grou ...
11-10-2017 at 05:59
by: Dr.Bob
Fisher Scientific & Restricted Chemicals
You won't save on shipping with any vendor like Fisher, they usually charge a fee per chemical, and ...
10-10-2017 at 15:18
by: Dr.Bob
Degasser units HPLC (really needed??)
It just bubbles N2 or He through the solvent, not essential, we rarely bother with it. Either take ...
10-10-2017 at 15:13
by: Dr.Bob
I would guess that adding any acid may form some form of mixed anhydride, some of which are better a ...
6-10-2017 at 17:32
by: Dr.Bob
Distilling adapters, 75 Bend 45/40 to 24/40
I have never seen quite that combination. I do have some adapters and some distillation heads, but ...
1-10-2017 at 17:14
by: Dr.Bob
absolutely HUGE chem glassware sale.
Shipping costs to Canada might bankrupt you, sadly. And the cvustoms paperwork is a real pain. O ...
24-9-2017 at 16:36
by: Dr.Bob
Candles question
Parafin is a complex mix of hydrocarbons, not just one compound. Much like gasoline contains many ...
16-9-2017 at 18:01
by: Dr.Bob
System to seperate Ethylene Glycol & PG from water - most efficient method?
AFAIK, distillation is the only good answer. You will have a hard time getting "pure" water from E ...
12-9-2017 at 17:43
by: Dr.Bob
Does anybody work in the "chemistry field"?
I agree that going back to school for new knowledge is always great and I recommend it.

However ...
12-9-2017 at 17:32
by: Dr.Bob
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