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Author: Subject: latest glassware purchase
VeritasC&E
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[*] posted on 3-8-2022 at 13:54


Quote: Originally posted by flaminglasrswrd  
The only thing I paid was a few cuts from some broken glass. Well, that and all of the time invested in checking the dumpster each week for the last few years.

The results:

Boxes and boxes of glassware and equipment. Several 2 and 3 liter RBFs, a 3L sep funnel, 4 Friedrichs condensers, two Edwards RV3 vacuum pumps, one Welch 8907 pump, two Buchi r114 rotavaps with water baths, a thermo 6255 vacuum oven, a Fluke 412B HV PS, a thermo CL2 centrifuge, a Lytron mcs20g cooler, and a thermo electron 2870 shaking water bath, two cases of TLC plates, and a couple of variable reflux distillation heads.

Lots of other condensers, graduated cylinders, addition funnels, flasks, assorted ground glass adapters, gas valves, some quartz stuff, and more.

All of the equipment seems to work and I tossed all of the broken glassware already. Some things have minor damage but they work all the same.

I had to make several trips back to the dumpster to get everything. Like I said in my other post, apparently one of the chem professors retired and they cleaned out his lab. Lucky me!

I'm keeping most of it, but if something catches your fancy lmk and maybe we can work out a deal.




I am so jealous of you that I cannot put it in words.

I would never have imagined that anyone on earth possibly could put stuff like these in a dumpster. Part of me thinks this cannot be true and you are just trying to trigger the passionate chemists in us.
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[*] posted on 28-9-2022 at 17:29


Today i get to use my Friedrich's condenser for the first time. i am just using it to reflux, which I know it is not really designed for. But it is still lots of fun.
:)
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[*] posted on 28-9-2022 at 19:19


Quote: Originally posted by Organikum  
Anyways if somebody can help me finding those reactor flasks DN100, 1000 ml and 2000 ml that would be great!

they have 2 L in stock and sell to EU, certainly surrounding countries, I do not know how far... also not sure about the diameter of neck whether it would be compatible with your cover part... also minimal order is 150 EUR so they won't sell you only this one flask for 100 EUR
https://sklep-chemland.pl/en/szklo-laboratoryjne/szklo-z-ele...
the seals compatible with their glass seem to be 100 mm
https://sklep-chemland.pl/en/szklo-laboratoryjne/szklo-z-ele...




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Organikum
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[*] posted on 29-9-2022 at 17:06


Thanks for the link, sadly they use a different flange and the prices are also quite hefty. This PTFE O-ring for the reactors is insane nearly 80 €, In Germany they want over a hundred though. Just a core of silicone rubber with PTFE coating. I buy the thinner silicone or rubber o-rings and wrap them in three layers of 19 mm x 0,2 mm PTFE tape. Thanks to the cold-creep of PTFE the tape sinters to a solid coating in no time. Cost per O-ring about 6 € and never had a problem at no temperature and with no solvent.

And I got a 2-liter reaction flask meanwhile, not cheap but cheap compared to what they want at official sources. 90 € I think? Was new. 250 € usual price.




Irgendwas is ja immer
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B(a)P
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[*] posted on 11-10-2022 at 01:14


My latest purchase. Looking forward to putting it to use.


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[*] posted on 12-10-2022 at 11:00


Some 10 X 150 mm quartz test tubes with shipping came to $3.00 a piece from China.


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[*] posted on 22-11-2022 at 15:56


Not glassware but most recent purchase that I am excited about, it came with more stirrers than listed so extra happy, to compliment it I ordered a Teflon stirrer and bearings (2 of them)

I'll be making a protective splash shield for it as well to ideally extend its life!

It is a 3 phase drive dc motor, very strong and smooth speed control

https://www.ebay.ca/itm/174250439099 < Canada

I'm very happy with it

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[*] posted on 22-11-2022 at 19:01


Quote: Originally posted by HydrogenSulphate  
Some GL45 reagent bottles. There are red cap versions, which have a PTFE liner.


you can buy yellow caps, orange, green, white transparent of silicone...

I've yellow caps/liners, silicone ones... the silicone is for high purity menstruums... the others, many are only for color coding and some few are for especial liquids/works.

check the catalogs!!! :-)


[file]95827[/file]

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[*] posted on 1-12-2022 at 10:54


Uh... Why do I have 2 10ml quartz beakers on my desk ?

I got that in the mail today from China but I assume I would remember buying them / find a trace in my recent purchases on eBay!

Weird, but I'll take it :P




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[*] posted on 2-12-2022 at 00:37


Quote: Originally posted by XeonTheMGPony  

It is a 3 phase drive dc motor, very strong and smooth speed control


These overheads are beyond superior bang for buck. They are very silent, smooth running, have freely adjustable rpm and have a lot of torque. They merely register when running 10 liter volume reactions and can run days non-stop. Once you get to see one of these, you will loathe over any magnetic stirrer for the rest of your life. It's more like comparing toothbrush or a PC fan to a small drill press in performance.

The stand included is also of exceptional quality and rigidity and weights several kg. The C-shaped stand is cast iron, and the two-piece shaft is 16mm steel with what looks like M10 thread. It could likely hold up your body weight no problem, the only major downside is it's very short, so you'd need to mount the motor to a 16mm round bar or a threaded rod mounted to a table or fume hood yourself. The stands excel as sep funnel or other tool holders.

You'd best get flexible shaft mount designed for linear controllers for 3D printers to mount a PTFE stirrer to the motor shaft. Set screw installation also ensures the stirrer won't drop into the flask and smash through the bottom during operation, especially vacuum.

They seem to work quite well with vacuum operations with PTFE ground joint bushing and fluorine rubber o-ring and paraffin oil lubrication. It will cut the high vacuum most likely because it naturally leaks a little, but it still enables distilling ~250C boiling liquids at 120-140C. High performance stirring improves reactions a lot by consistent and strong mixing and thermal balance, which enables both less or more cooling or heating depending on what is desired, and it creates similar effect to rotavap when distilling - stripping solvents that is - allowing you to input a lot of heat without bumping and it increases evaporation rate.

Funny enough I would say they are overkill for smaller than 2L flasks and really get to their working range with 5-10L flasks minimum and could likely stir reactions to 20-50 liters with zero issues over protracted times, hence they also suit for purposes like stirring mash for fermenting alcohol.
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[*] posted on 2-12-2022 at 17:37


Quote: Originally posted by Herr Haber  
Uh... Why do I have 2 10ml quartz beakers on my desk ?

I got that in the mail today from China but I assume I would remember buying them / find a trace in my recent purchases on eBay!

Weird, but I'll take it :P

I have it on good authority that you have made it onto the Nice List this year.
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[*] posted on 7-12-2022 at 11:27


Galileo thermometer from here: https://shop.es-drei.de/laborbedarf/laborzubehoer/13578/ther...
It was a reagent order, but I added this toy into the basket too.
When cold, everything floats on the top, that was also the case when I got the parcel (winter here). Now burning firewood in my stove so quite warm here, most of balls sank to the bottom and the one floating is telling 26 C.

IMG_20221207_201651_1_sm.jpg - 362kB

[Edited on 7-12-2022 by Fery]
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[*] posted on 7-12-2022 at 15:19


Quote: Originally posted by Fyndium  
Quote: Originally posted by XeonTheMGPony  

It is a 3 phase drive dc motor, very strong and smooth speed control


These overheads are beyond superior bang for buck. They are very silent, smooth running, have freely adjustable rpm and have a lot of torque. They merely register when running 10 liter volume reactions and can run days non-stop. Once you get to see one of these, you will loathe over any magnetic stirrer for the rest of your life. It's more like comparing toothbrush or a PC fan to a small drill press in performance.

The stand included is also of exceptional quality and rigidity and weights several kg. The C-shaped stand is cast iron, and the two-piece shaft is 16mm steel with what looks like M10 thread. It could likely hold up your body weight no problem, the only major downside is it's very short, so you'd need to mount the motor to a 16mm round bar or a threaded rod mounted to a table or fume hood yourself. The stands excel as sep funnel or other tool holders.

You'd best get flexible shaft mount designed for linear controllers for 3D printers to mount a PTFE stirrer to the motor shaft. Set screw installation also ensures the stirrer won't drop into the flask and smash through the bottom during operation, especially vacuum.

They seem to work quite well with vacuum operations with PTFE ground joint bushing and fluorine rubber o-ring and paraffin oil lubrication. It will cut the high vacuum most likely because it naturally leaks a little, but it still enables distilling ~250C boiling liquids at 120-140C. High performance stirring improves reactions a lot by consistent and strong mixing and thermal balance, which enables both less or more cooling or heating depending on what is desired, and it creates similar effect to rotavap when distilling - stripping solvents that is - allowing you to input a lot of heat without bumping and it increases evaporation rate.

Funny enough I would say they are overkill for smaller than 2L flasks and really get to their working range with 5-10L flasks minimum and could likely stir reactions to 20-50 liters with zero issues over protracted times, hence they also suit for purposes like stirring mash for fermenting alcohol.


My bearings arrived! very nice given the cost of em, love the feel of solid Teflon!

I got it for trying to make Acetic anhydride via our deal late friends post in the reference section

I'll be using Silicon grease for one, but oil is a good idea as all, was wondering what I could use other then the grease, now I know!


stirrer bearings..jpg - 32kB

[Edited on 7-12-2022 by XeonTheMGPony]
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