Sciencemadness Discussion Board

latest glassware purchase

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j_sum1 - 18-11-2020 at 19:26

Quote: Originally posted by Heptylene  
I just got an Anschütz-Thiele receiver, which is the german version of the Perkin triangle. I've been trying to find one for some time now since they cost an arm when new. Thankfully, ebay exists and an opportunity finally presented itself :)

This is actually a really useful piece of equipment: it allows the collection of many fractions during vacuum distillation without having to bring the whole apparatus back to atmospheric pressure. Normally you are limited to 3-4 fractions if you're using a cow receiver, but not with this!

That is gorgeous, Heptylene. Nice acquisition.

Fery - 27-11-2020 at 03:36

Heptylene congrat. Recently I managed to buy Anschütz-Thiele receiver too :)

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here nicely explained how does it work:
https://www.bcp.fu-berlin.de/chemie/chemie/studium/ocpraktik...
https://en.wikipedia.org/wiki/Perkin_triangle

HydrogenSulphate - 29-11-2020 at 13:15

Some GL45 reagent bottles. I really like these! Although they are not exactly cheap, they are of high quality. There are red cap versions, which have a PTFE liner. The PTFE lined ones are even more expensive. Do you think that the blue cap bottles will suffice for most situations? When would you prefer the red caps over the blue caps?

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[Edited on 29-11-2020 by HydrogenSulphate]

HydrogenSulphate - 29-11-2020 at 13:22

Quote: Originally posted by Db33  
i posted that i needed some good dry/wet chem storage bottles. So i found a lot on eBay the guy was selling the lot for $85 but he accepted my offer for $50 so im very happy with the deal. You cant see it but theres also a top shelf with a lot of tiny vial sized bottles. I actually got this little cupboard specifically for this so i think its a pretty good start.




I am a big fan of the old fashioned Apothecary bottles. Adrian ('Plasticraincoat1' or 'Adrian's Chemistry Laboratory' on youtube) has a lot of the old fashioned bottles in his lab

[Edited on 29-11-2020 by HydrogenSulphate]

[Edited on 29-11-2020 by HydrogenSulphate]

DraconicAcid - 29-11-2020 at 13:22

I was browsing online for gifts for other people, and then couldn't resist buying myself a couple cheap nickel crucibles from AliX. I'm hoping to hydrolyze piperine to the acid without a twelve-hour reflux (higher temp, ethylene glycol, KOH).

Fluorite - 19-12-2020 at 10:40

i found someone IN TUNISIA willing to sell me a flask for 6$ but the condenser is a bit expensive i guess 28$ but idk where to find adapter so i can use this just for reflux

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RustyShackleford - 19-12-2020 at 11:13

Quote: Originally posted by HydrogenSulphate  
When would you prefer the red caps over the blue caps?

When storing something like bromine or low boiling stuff like ethyl ether or bromoethane

Fery - 12-1-2021 at 12:49

Here without looking for them I found these Anschutz-Thiele receivers with good price and various joints sizes:
https://www.ebay.com/itm/14-23-19-26-24-29-29-32-Female-x-Ma...
https://www.ebay.com/itm/182711306166
https://www.ebay.com/itm/14-23-Female-x-14-23-Male-Joint-Gla...

wg48temp9 - 14-1-2021 at 04:55

I have been after some cheap SS 1/4" VCR hi vacuum/pressure gas fittings for some time. I finally won an auction on a job lot of used ones for £12.50. They arrived today. I did not win 55mm diameter vacuum valve that i also needed. That sold for more than £100.

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earpain - 30-1-2021 at 12:13

So you guys probably saw these kits flood the Chinese shill vendors who may or may not have warehouses right next to you(but it always says they do).

Looks like the 'guild' has raised the price. My order went like this:
posted as ~$60 or best offer. Hmmmm, normally for $60USD i might get two of those items at best. So i went through his history for this item, and almost all the orders said "accepted offer". So brazenly, I offered $7 below asking. I said it was a great deal but i'm very poor. Response was warm and friendly. And discount #1: he countered at $3.00 below asking price. I said hell yes.
So then of course i get a tracking number that for over a week is stuck at "waiting for package to arrive at facility/" I know what this means. I sent him a message saying I thought that was a bit sleazy, since the marketing included a map of my country with regions showing either 1, 2, or 3 days! I was in the 2 day zone.
BAM: Instant Discount #2 - $10 refunded to my PayPal right away.

I kind of have to now confess that this is the best deal ever for glassware. It is branded, however the company's name is in Chinese characters. But the Glassware is up to par with Deschem if not better.
The cut out foam is now the 'case' for safe storage.
The leibig and the vigereux column are so much longer in real life than it looks like in the picture. This really makes a huge difference for distillations.
The addition funnel has some new design for its stopcock that I cannot explain. But somehow it allows both for perfect drip...drip.. control, and yet if a bunch of salt or gunk clog up the bottom, i can turn it and it all plops out. It's the perfect separation stopcock.
Yes I have enough 3-way adapters now to last me several life times.
Lastly: I was SURE i had received the wrong keck clamps at first, they looked like 19/x. Then I thought 'hmmm', with some extra thumb muscle, it snaps on, and it SNAPS on any joint. Like these keck clamps will hold big flasks and condensors while they patiently wait for me to find my support hardware(do not do that ever, so stupid)
(the thermometer went up to 100C and broke the first day. Nothing else has broken at all)





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Fyndium - 30-1-2021 at 13:51

I don't know who and how these glassware are made, but for the price, someone's gotta do them very fast and easy, or then they get paid pennies. What I've watched glassware making videos, it's not difficult for a professional glassworker to churn out a pressure compensated funnel, but it still takes it's time.

I mean, you get dozen of hours of work worth of glass with $60 including shipping.

arkoma - 30-1-2021 at 15:22

just got a new 500ml triple neck, five stoppers, a gas inlet and a couple glass petri dishes from nanshin. amazingly, only took three weeks from china.

earpain - 30-1-2021 at 17:15

Quote: Originally posted by Fyndium  
I don't know who and how these glassware are made, but for the price, someone's gotta do them very fast and easy, or then they get paid pennies. What I've watched glassware making videos, it's not difficult for a professional glassworker to churn out a pressure compensated funnel, but it still takes it's time.

I mean, you get dozen of hours of work worth of glass with $60 including shipping.


One of the Dutch companies that's famous for making cannabis bongs a la scientific glassware has a documentary where they reveal their process.
Robots. Robots that can hold glass tubes, robots with 8 arms, each one with an oxy-acetylene torch extending simultaneously, and so on.

I have basic training in glass work, and you're absolutely right, if these were man made. The reason I say it's quality work is because i examined the usual stress spots. Such as inside meets water jacket meets air meets ground glass joint on a condenser. Traditionally this required a human's attention, as the thickness required is not linear relative to amount of glass. The Chinese are smart.

Why pennies to us is a working wage to them, is a matter beyond the scope of this chat of course=D


edit: here's a better pic. I tried my best to show probably my favorite piece in the set, and why it impresses me so much. One would really need to hold it, and use it, to see what I mean. That 2nd neck tangential to the overall sphere is not trivial.
[Edited on 31-1-2021 by earpain]

[Edited on 31-1-2021 by earpain]

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Fyndium - 1-2-2021 at 10:23

Latest purchases:

6000mL triple neck flask
5000mL quad neck flask
300mm thermowells, which I already shortened to proper length with burner
New graham and coil condensers
Glass thimble for soxhlet
30mm test tubes, lot
Different sized joint adapters for 7mm glass tube for bleeder tubes and fuororubber o rings for them and for stirrer adapters
Overhead stirrer
Heating mantle with stir and probe
Delrin stock to mill more rigid boss heads

Fery - 9-2-2021 at 10:19

This was my biggest glass purchase in my life, it arrived on pallet, usual way in carton / styrofoam box (as from ebay from China) was not sufficient now. I expanded my shopping activities abroad. I can buy all these items in my country too, but here they are 2-3-4 times more expensive.
I definitely suggest chemland.pl
There is a limit that you have to place and order of 150 EUR or above. The final price shown in eshop cart is without VAT. The VAT in PL is 23%.
The shipping cost of the pallet transport for me was 60 EUR (including VAT) for 1 pallet upto 150 kg, I'm living in the neighbouring country so shipping into further country is certainly more expensive, it seems they ship to the whole EU. When ordering less or smaller items which could fit into standard carton / styrofoam box instead to pallet the cost of transport could be very likely lower.
I couldn't make a photo of everything unpacked, so only the most valuable pieces for me - dropping funnels with pressure equalizing and long powerful condensers (the shorter one has 40 cm long active cooling part and the rest 60 cm).
The Glassco brand ground glass joints are higher quality, the Chemland brand ground glass joints have slightly less accuracy but still OK for home lab (grease fills and closes every gap). I selected Glassco everywhere possible (e.g. RBF).

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[Edited on 9-2-2021 by Fery]

paulll - 22-2-2021 at 14:06


Been keeping the postman busy lately. Not pallets-of-stuff busy, but still.

Fyndium - 22-2-2021 at 21:48

Quote: Originally posted by Fery  
long powerful condensers (the shorter one has 40 cm long active cooling part and the rest 60 cm)


I noted that condensers choke quite easily when pushing too hard. I got an issue with exothermic reaction which was near boiling over as condenser quickly filled with condensed liquid. 24* are more prone than 29*. I'd choose 45* joint for any larger condenser need nowadays.

Fery - 22-2-2021 at 23:10

Fyndium that's true. The condensers which I've bought are all 29/32.
Condensers with ground glass joints 45/40 are available too. For these bigger joints there are flasks of volume 250, 500, 1000, 2000, 4000 ml.
6 as well 10 L RBF have even bigger joints 60/46.
But a 29/32 condenser like this is wide enough not to choke at condensate flow certainly more than 20 ml per second

Fery - 8-3-2021 at 09:44

Another good order from chemland.pl
Beats 2-4 times the prices of the glass sold in my country and still beats the prices of Chinese glass from ebay.
Palette size order again, the price of shipping dissolves in the value of items.
Not only glass but also a few of reagents.
The RBF in the cardboard box in the middle of picture from which only its neck and joint is visible is 6 L RBF.
Also few hundreds of vials and caps on the left side of RBF, I believe enough for the rest of my life. I used to use vials from pills which my grandmother took -but she is not with us already for decades.

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[Edited on 8-3-2021 by Fery]

Fyndium - 9-3-2021 at 14:33

Damn, next time I'm gonna stock from Chemland too. Many of their prices are basically ridiculously cheap.

Only big con is they only supply single neck flasks for bigger sizes. I wish they expand to 3- and 4-neck rbf:s. Single necks are really limited for practical reaction use.

Fery - 9-3-2021 at 23:34

Fyndium, you are right, the biggest RBF 1 L:
https://sklep-chemland.pl/en/szklo-laboratoryjne/szklo-z-ele...
https://sklep-chemland.pl/en/szklo-laboratoryjne/szklo-z-ele...

I buy sometimes from this seller in my country but I do not know whether they sell abroad, but I suppose they don't as the only one language in eshop is CZ. They sell upto 6 L flasks with upto 3 necks (straight=parallel or 20 deg angle)
https://www.verkon.cz/banka-destilacni-s-kulatym-dnem-a-dvem...
https://www.verkon.cz/banka-destilacni-s-kulatym-dnem-a-dvem...
here I found prices for delivery and everything is only for delivering inside country:
https://www.verkon.cz/download/file/19509/cenik-prepravy-12-...
for the prices recalculation Kc means CZK, you can approximate 1 EUR = 26 CZK these days and the prices are without VAT, so you must add 21% into the price seen in the eshop.
Also the prices in chemland are without VAT which is 23% in Poland.

[Edited on 10-3-2021 by Fery]

Fery - 10-3-2021 at 07:18

I won in an auction a beautiful historical glass piece made in Sklarny Kavalier CZ under brand name Sial, the manufactured later changed its brand name to Simax. Only 4 CZK which is 20 cents for this water vacuum pump, it arrived today by a postal service.

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itsallgoodjames - 10-3-2021 at 08:36

Quote: Originally posted by Fyndium  
I don't know who and how these glassware are made, but for the price, someone's gotta do them very fast and easy, or then they get paid pennies. What I've watched glassware making videos, it's not difficult for a professional glassworker to churn out a pressure compensated funnel, but it still takes it's time.

I mean, you get dozen of hours of work worth of glass with $60 including shipping.


It's all machine made. There isn't a person manually making it, there's just someone that operates the machine that makes it. That's the reason they can be so cheap

Schleimsäure - 13-3-2021 at 13:36

Not glassware, but a professional vacuum pump from KFN Neuberger:



Chemical resistant, even for most aggressive gases. 8 mbar.

180 EUR including shipment. Shows that not too many people have money at hand anymore. Usually worth 600 EUR at least. New 1200 EUR.


XeonTheMGPony - 18-3-2021 at 17:17

recent glass order from daschem,e excellently packed per usual.

vacuum trap and the rest you'll recognize.

Going to do some sodium once my magnesium arrives and finally make 1, 4, dioxane via the FeSO3 method.

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Fyndium - 23-3-2021 at 09:55

Deschem has served me great, too. They have improved their shipping recently, and shipments have been coming over pretty much consistently in 2-3 weeks, packed to withstand intercontinental damage.

I just received another order from them, nothing fancy, just a stock of some spare parts and an extra jack. Also I bought a short vigreux head to allow for better separation compared to straight distillation without greatly impeding flowrate.

The 50mL glass syringe is also fancy.

loot.jpg - 104kB

arkoma - 23-3-2021 at 13:39

300mm Allihn condeser, 100mm thermo well, couple flasks. From deschem.

karlos³ - 23-3-2021 at 16:19

I have to say, deschem really improved their shipping times!
I had to re-order a few thermometers and simply bought twice as much... 7 working days only!
Impressive :)

Fyndium - 24-3-2021 at 03:12

Fastest for me has been 7 days too, exceptional. Usually it takes 2-3 weeks, or around 20 days.

At least for some parcels they have started using forwarding parcel services, which means faster shipping and they take care of importing. I would call that a great service.

100% of my equipment bought from them has been flawless. One shipment was smashed on the way, but it was not their fault - the parcel was just plain crushed with something HEAVY, and I mean it - I can stand on their parcels with no stress, they are so rigid so I believe something major fell on it. It was resolved in a very convenient manner.

Phosphor-ing - 28-3-2021 at 18:21

I recently received my 4th or 5th order from Dr.Bob. Hot plate/stirrer, condenser, long vigreux column and various flasks in 29/42. Love ordering from him. He Includes free stuff and packs it to survive whatever the shippers can dish out.

earpain - 11-4-2021 at 08:10

Quote: Originally posted by earpain  
So you guys probably saw these kits flood the Chinese shill vendors who may or may not have warehouses right next to you(but it always says they do).

Looks like the 'guild' has raised the price. My order went like this:
posted as ~$60 or best offer. Hmmmm, normally for $60USD i might get two of those items at best. So i went through his history for this item, and almost all the orders said "accepted offer". So brazenly, I offered $7 below asking. I said it was a great deal but i'm very poor. Response was warm and friendly. And discount #1: he countered at $3.00 below asking price. I said hell yes.
So then of course i get a tracking number that for over a week is stuck at "waiting for package to arrive at facility/" I know what this means. I sent him a message saying I thought that was a bit sleazy, since the marketing included a map of my country with regions showing either 1, 2, or 3 days! I was in the 2 day zone.
BAM: Instant Discount #2 - $10 refunded to my PayPal right away.

I kind of have to now confess that this is the best deal ever for glassware. It is branded, however the company's name is in Chinese characters. But the Glassware is up to par with Deschem if not better.
The cut out foam is now the 'case' for safe storage.
The leibig and the vigereux column are so much longer in real life than it looks like in the picture. This really makes a huge difference for distillations.
The addition funnel has some new design for its stopcock that I cannot explain. But somehow it allows both for perfect drip...drip.. control, and yet if a bunch of salt or gunk clog up the bottom, i can turn it and it all plops out. It's the perfect separation stopcock.
Yes I have enough 3-way adapters now to last me several life times.
Lastly: I was SURE i had received the wrong keck clamps at first, they looked like 19/x. Then I thought 'hmmm', with some extra thumb muscle, it snaps on, and it SNAPS on any joint. Like these keck clamps will hold big flasks and condensors while they patiently wait for me to find my support hardware(do not do that ever, so stupid)
(the thermometer went up to 100C and broke the first day. Nothing else has broken at all)







Update: too good to be true is just that. However, this remains to be a great deal. It almost feels as though the worst glassware was mixed in with the best, for obfuscation.

Edited image is self-explanatory.
worth a mention:
* Addition funnel works, though 24/40 joint is gone
Condenser and Vigreux column seem to be indestructible(famous last words)
Crossed out glass stoppers represent proportion of the total. As there were stoppers lined around the entire package.
I treat my glassware a bit rough, but I prefer that to a 'walking on egg shells approach'.
s-l1600.jpg - 478kB

My apologies for unintentionally misleading

Fluorite - 23-4-2021 at 17:42

I'm excited because I finally bought a sep funnel, 1L Erlenmeyer flask and beaker (with some tiny air bubbles in the glass but whatever) and 500ml reagent bottle with PP lid

Any tips for using these without breaking them?
Should I boil water in a glass to get it hot before boiling sulfuric acid in it?
Is it better to heat the glass as slow as possible to prevent thermal shocks?
And is paraffin wax bath good for boiling sulfuric acid?
Oh and the air bubbles! Should I be worried?


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Oxy - 23-4-2021 at 22:36

If the glassware is made of borosilicate glass you don't need to pre-heat it. It can withstand a significant thermal shock, so it will definitely survive some gentle heating. Do it slowly however and remember that boiling-hot sulphuric acid is known of violent bumping, which can lead to some damage to the glass and things nearby.

earpain - 28-4-2021 at 16:02

yup. what's the brand? Esco labs? I never had any of there glassware but they seem very reputable.

Beakers, except maybe huge ones, are probably the hardest to break. Along with Erlenmeyers/conicals.

Thermal shock is nowhere near the top of my list of causes of broken glassware. It's definitely much more likely to occur upon cooling from a heated state, than from sudden heating. Reason being, since generally one heats the vessel from the outside, the outer portion of the glass wall will expand first, and there's nothing constricting it from expansion. However when cooling down, the innermost part of the glass wall will be in a hot, still expanding state. Dropping it in an ice bath will first cool the outer side, constricting the not-yet-cooled inside, and if the Delta(T) is severe enough, it has no choice but to crack.

Definitely don't heat up your beaker you intend to put H2SO4 in with water first. Better to heat it up with H2SO4 in it, ya know?

The mid 300's C, the BP of H2SO4, is childs play compared to the temperatures I deal with when I manipulate boro glass with a torch.

But yeah, i'm still watching that thing like a hawk anytime I'm concentrating H2SO4, and have some sort of plan B in mind if the worst happens.


Fyndium - 28-4-2021 at 23:20

160C is the gradient for boro.

Although, when I cool down reactions that are hot, like 150C, I first use hot water, 50-70C, to bring it below 100, and then use cold water to finalize it to ntp.

I don't know if anyone has yet tested it, but I suggested using air pump and bleeder tube to agitate sulfuric acid to prevent bumping. Also, I would use flask that is worth losing, like cheap 2L rbf, and it also needs a lot of heat, so it likely must be heated directly with propane gas. I've noticed that for effective boiling, thermal gradient must be over 20C with water-CaCl2 bath, and 50C with oil bath.

arkoma - 30-4-2021 at 17:24

Estate sale!

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earpain - 9-5-2021 at 13:20

Quote: Originally posted by Fyndium  
160C is the gradient for boro.

Although, when I cool down reactions that are hot, like 150C, I first use hot water, 50-70C, to bring it below 100, and then use cold water to finalize it to ntp.

I don't know if anyone has yet tested it, but I suggested using air pump and bleeder tube to agitate sulfuric acid to prevent bumping. Also, I would use flask that is worth losing, like cheap 2L rbf, and it also needs a lot of heat, so it likely must be heated directly with propane gas. I've noticed that for effective boiling, thermal gradient must be over 20C with water-CaCl2 bath, and 50C with oil bath.


Although almost all borosilicate scientific glassware proudly boasts of the 3.3 thermal expansion coefficient, there are still different types of boro, some more heat conductive, some more insulating. Some have a chemical treatment done onto the surface as a final step to make the glass hydrophobic - I've noticed this effect in some of the very high end brands.

H2SO4 - hmm, I see your logic there. But on the flipside, I might say that such times call for the best, most durable of my glasswares.

Although I'll admit it's been years since I've had oxy/propane and worked wall thickness in the scale of most scientific devices, I routinely work test tubes, thinner parts of broken devices etc. over open atmospheric propane.
Unless I'm aiming for a complex spot, I've never had an issue with going directly to open flame. Not with boro.

Having the container filled with H2SO4 should even further fortify the thermal structural integrity. What I don't do is put a beaker on metal grill over open flame, such as on my stove. I put a frying pan on the metal grill parts, beaker on the frying pan.

One of my longest lasting and most abused, 1L erlenmeyers was routinely heated that way for like a year. And then one day it cracked, from sudden heat.


So my observation for thermal gradient, is that it depends on the vessel, and the glass. If I have a specific pan with sand in it I plan to reuse, and a specific flask, first time I bring something with a high BP to a boil, with two thermometers.

A tiny 50ml RBF will have a far more dramatic temp difference, as well as thermal latency effect, as compared to a 2L RBF.

violet sin - 12-5-2021 at 23:08

I feel this counts, or close enough. I ordered a few Geiger–Müller tubes from GSTube.com and they came the other day. Total 2 months in shipping lol, Mar 2 - May 6. But intact they were :) box was in great shape.


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High Efficiency Condenser

MadHatter - 8-11-2021 at 11:42

GIFT-SS-2021C.jpg - 541kB
Recent acquisition: Davies double jacket(300 mm) condenser

SWIM - 13-11-2021 at 13:46

An "Ace Glass #7 Jacketed column" according to Ebay.
Actually a quartz immersion well.

The brown stains in the water jacket make me think the last owner though it was a cold trap and used it for vacuum distillations.


quartz immersion well.jpg - 104kB
It does have some cheesy hose fitting jammed in the ace thread inlet.
Its jammed in the real hard, but I figure if a wrench won't loosen it I can just burn it out with a propane torch, and then dip the immersion well in a bathtub to cool it off.:D
Thermal gradients be damned!

[Edited on 13-11-2021 by SWIM]

SWIM - 13-11-2021 at 14:28

Quote: Originally posted by arkoma  
Estate sale!



I'd sure like to find out what the story is with Vineland, New Jersey.
It's the one city name I see most often associated with jointed glassware.

Ace Glass, Wilmad, and at least three other companies.
Now four counting the stuff you just bought.

If you heave a brick out a window in Vineland you must have a pretty good chance of hitting a glassblower with it.

more vineland glass!.jpg - 2.8MB
Edit: LG glass and Bellco are there too.

Edit: @ S,C, Wack, thanks for the info.

[Edited on 13-11-2021 by SWIM]

[Edited on 13-11-2021 by SWIM]


[Edited on 14-11-2021 by SWIM]

S.C. Wack - 13-11-2021 at 17:07

There's a school there for one thing. It wasn't all that expensive either when I looked a long time ago and should have went but didn't because where was I going to live or find a job. Can't just start a glass operation in Topeka. IIRC glass companies originally started there because of a nearby source of particularly good sand.

What I always wanted

Organikum - 28-11-2021 at 00:01

I finally fulfilled my long harbored dream and got me this:

reaktor7.png - 5.1MB


The reactor. So tired of cleaning big flasks through tiny openings, no proper stirrer can be used for everything has to get through a small hole, I believe all flasks of 1000ml or larger should be outlawed and replaced by something like this.

Also this is much simpler to produce (at least the flasks, maybe not the heads) they are prohibitively expensive. But I was luck and found the probably best second hand lab equipment dealer in Germany ("secondlab" on Ebay Kleinanzeigen, nice guy, is aktiv on Illumina) and so I went for it.

Sadly he had only the 4 liter reactor flask and I got a 500 ml for a decent price elsewhere, but now I am searching for 1 liter and 2 liter and cannot find anything for a reasonable price. I would need the kind with the groove for an O-ring so any possible. And it is DN100.

The secondlab is really gold, the high performance condenser in the picture was about 30 € and I got an Anschütz-Thiele for 25 €, I seriously could not believe it. And it is all in decent shape, the important stuff is mostly Schott, some Jena some Mainz but this is all good IMHO, personally I prefer the thinner Jena glas over the very thick new kind as the heat transfer is so much better with thinner glass.

Anyways if somebody can help me finding those reactor flasks DN100, 1000 ml and 2000 ml that would be great!

thx
ORG

[Edited on 28-11-2021 by Organikum]

SWIM - 28-11-2021 at 01:07

Is that little heating bath okay?

A lot of manufacturers of similar reaction vessels in the USA specify low watt-density heating (like mantles) to avoid cracking the thicker glass.

Maybe I'm over-cautious, but if I don't have a mantle the right size I use a heat bath that covers a lot more of the vessel's body.

[Edited on 28-11-2021 by SWIM]

Herr Haber - 5-2-2022 at 12:50

A cousin living in Mainz (Germany) sent me 45 Duran test tubes for my 45th birthday.
Pretty cool and I like the humor.

Mainz is the headquarters for Schott GMBH.

Weirdest of all, every one of them arrived intact. I didnt think that was possible when sending test tubes.

Organikum - 5-2-2022 at 20:34

Quote: Originally posted by SWIM  
Is that little heating bath okay?

A lot of manufacturers of similar reaction vessels in the USA specify low watt-density heating (like mantles) to avoid cracking the thicker glass.

Maybe I'm over-cautious, but if I don't have a mantle the right size I use a heat bath that covers a lot more of the vessel's body.

[Edited on 28-11-2021 by SWIM]

Oh, there is no heating bath at all, what you see is a ring to hold the vessel up. This was just a first test setup anyways, virtually everything is changed now, I will soon post a picture of it in its last iteration.
But I still do not use a liquid bath, I am with the good old "hot air bath". The vessel never touches the hotplate which can get get glowing red hot so necessary (PID controlled), a aluminium foil "tent" keeps the hot air near to the flask, most heat transfer is by infrared radiation though.
This keeps the thermal masses low and is very gentle on the glassware. No hot liquids involved.

/ORG

TinyPlanets - 4-6-2022 at 17:34

Little vacuum sublimator and some new PTFE sleeves.
I loathe vacuum grease and these new sleeves are a dream.
My older PTFE (made in 2000) sleeves are thinner, unribbed and have a habit of getting stuck permanently on joints.. have to rip them off with pliers (damaging them in the process) when they're stuck.
Surprised there is so little information on PTFE joint sleeves available online.. would be nice to read a usage guide or some hacks.

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Dumpster dive finds!

flaminglasrswrd - 24-6-2022 at 14:53

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.


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Rainwater - 24-6-2022 at 16:05

2 pressure equalized addition funnel, please. Sweet score btw

B(a)P - 27-7-2022 at 18:14

Just got myself a secondhand IKA Combimag-RET hotplate stirrer, to replace my wounded cheapo 79-1 hotplate stirrer.
Can't wait to put it to use, sadly it is staying in its box as we are in the process of moving house.

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VeritasC&E - 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.

j_sum1 - 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.
:)

Fery - 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...

Organikum - 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.

B(a)P - 11-10-2022 at 01:14

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


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Morgan - 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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XeonTheMGPony - 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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pneumatician - 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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Herr Haber - 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

Fyndium - 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.

j_sum1 - 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.

Fery - 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.

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[Edited on 7-12-2022 by Fery]

XeonTheMGPony - 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!


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[Edited on 7-12-2022 by XeonTheMGPony]

Organikum - 9-12-2022 at 04:07

I suppose you will be using the PTFE coated stirrers with this. I recommend to buy a few Viton or other Fluoropolymere O-rings with nominally 8 mm ID. Those are always a little bit tighter then nominal and the 7 mm shaft is actually wider the 7 mm. So using a 8 mm O-ring is perfect as it will be squeezed tighter when it gets screwed down. The original 7 mm O-rings leave bad grooves on the shaft in no time, not good at all.

It is possible you have to widen the seating of the O-ring a little bit so it sits nicely centered but thats no problem using a 12 mm metal drill or similar item. You use it by hand, not in the drill of course!

Sulaiman - 9-12-2022 at 06:47

Quote: Originally posted by Organikum  
. The original 7 mm O-rings leave bad grooves on the shaft in no time, not good at all.

+1

XeonTheMGPony - 9-12-2022 at 15:19

Quote: Originally posted by Organikum  
I suppose you will be using the PTFE coated stirrers with this. I recommend to buy a few Viton or other Fluoropolymere O-rings with nominally 8 mm ID. Those are always a little bit tighter then nominal and the 7 mm shaft is actually wider the 7 mm. So using a 8 mm O-ring is perfect as it will be squeezed tighter when it gets screwed down. The original 7 mm O-rings leave bad grooves on the shaft in no time, not good at all.

It is possible you have to widen the seating of the O-ring a little bit so it sits nicely centered but thats no problem using a 12 mm metal drill or similar item. You use it by hand, not in the drill of course!


Ironically I am working on finding some better vitron o rings for it, and my second teflon stirrer I ordered arrived along with my balls for the mill! The one that came with it wasn't going to clear with a claison adapter in the mix

ignore the heater pad, that's for my genset.

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Rainwater - 23-1-2023 at 16:48

Ordered me a new distillation head a few weeks ago, and she just came in.
Actually, I broke 3 claisen adapters trying to make this before I called a professional

https://www.clearhorizonsglass.com/
Gonna break her in this weekend.

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