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grndpndr
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Sauron
For your own safety do not buy dodgy eBay glassware
[/rquote] Id assumed if labeled/advertised borosilicate glass
Id be safe.Im contemplating buying a distilling apparatus.1000ml flask ,200-300 ml condenser,500ml RB flask ,connectors and adapter for included
thermometer @
around $125 +/- given the specific distributor.I assume its chinese borosolicate but I havent had any problem with my budget driven purchases of
chinese borosilicate no name glassware OT a seperatory funnels poor QC of valve dimensions.Specific brand names I should look for?I see also on e-bay
higher priced equivalents (quantitatively) for About$300 +.As I intend to use the equipment for corrosive liquids Im not looking forward to glassware
failures.
As i mentioned ive been using chinex borosilicate glassware without incident given proper precautions same with coffee pots withstanding rapid temp
change.Also canning jars seem to stand up well with a bit of restraint.
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DJF90
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Go for Quickfit if you're UK (or generally Europe?), or Ace, Pyrex or Corning for the US.
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grndpndr
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Most equipment that catches my eye pricewise doesnt advertise a maker(simply borosilicate glassware) however I have found a few lab supply companys
that will either name the glassware or lose a sale.
Thanks for the names of reliable companys.
Ive located the name of that chin glassware although Im sure it floats around under several brand names,Bomex.
BOrosilicate/pyrEX.power of suggestion?Although honestly it hasnt failed using proper lab precautions over several years
other than normal accidents/carelessness
[Edited on 9-5-2009 by grndpndr]
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MadHatter
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Pyrex
I had a so-called Pyrex casserole dish made by Anchor Hocking explode on me.
Strangely, I have older(dark brown tinted) glass cookware that have no labels but
never gave me a problem under any circumstances. As for lab glass, use Bomex only
for applications that don't involve heat.
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
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497
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I have a 1000ml Bomex Erlenmeyer which I use regularly to boil down H2SO4. It gets heated to 300*C for long periods of time directly over a propane
flame... I've probably used it 30 times for that purpose, never had a problem. So am I just lucky?
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watson.fawkes
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Bomex is a borosilicate glass: http://www.tzbomex.com/en/xn.htm.
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grndpndr
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I generally use a hotplate and screen arrangement but for the same purpose and worse w/o incident .As I say the only losses have been thru
carelessness,so far.
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jimwig
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nothing lasts forever
the best in borosilicate still has to conform to the laws of physics.
a crack or chip almost invisible can cause catastrophic results.
also one should use a diffusion type of layering even when using a supposedly safe source of heat - like the corning ceramic surfaces.
and in closing nothing lasts forever and even corning-- both glass and other things have a finite lifetime.
i jusst lost a 10 x 10 inch corning combo stirrer/hotplace. the ceramic top fractured into about a dozen large pieces.
craZy jiM wGGns
--packrat, professional bum. -- once just tired
now REtired.
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grndpndr
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Of course something with obvious flaws even scratches can be suspect and I always use the approach you describe either a screen on a hotplate,I
personally think oilbaths are dangerous themselves but Ill use a sandbath etc.but I never expose my glass to a direct heat source and try to protect
myself more than my glassware.Particularly not to forget your lungs.Glassware can be replaced, lung,cornea,and skin grafts/ transplants not so easy.Im
sure yor all aware of the danger but if it causes a bulletproof youngster to consider the implications its the best contribution I could make.Just
because it doesnt kill outright or cause a hospital visit doesnt mean the damage isnt cumulative.Just take care like you would with any dangerous
equipment etc.Dangers that are common knowledge now werent when I was a youngster many are just know paying the price.Rant exhausted.
[Edited on 11-5-2009 by grndpndr]
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jmneissa
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Well I have to vent here as well I just got some brand new flasks today including some expensive two neck flasks. Well I was washing them out and set
them upside down to dry when one tipped over and shattered! I can't believe it. It just falls over and breaks! Come on this is ridiculous I mean
falling off a table okay but just rolling over? It's a complete joke now I am on the phone with glass companies trying to get it repaired because
there is no such thing as a "warranty" with glassware... Even then they say it could cost more than the flask is worth to repair it!! Aghhhh!!!! So
annoying basically $66 + SH just went down the drain...
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dann2
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Simax glassware, from Czech Republic
Hello Folks,
Looks like some are having a 'smashin' time eh 
Just wondering what you's think of Simax wear (make in the Czech Republic).
See ebay here.
or is a case of Fuck Simax.
Dann2
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Lambda-Eyde
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Most of my glassware (except for the ground glass) is Simax brand, but I haven't used it much, so I can't really tell much about its quality.
From what I can see though, the beakers and flasks appear very sturdy with nice markings.
An interesting sidenote: I saw a 50l Chemglass 3-neck jacketed flask with a bottom drain on eBay - which also had the Simax logo on it!
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dann2
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Hello,
For the (perhaps) dodgey 'Pyrex' home cook glasswear a test could be done whereby the vessel is put into an oven and heated to 200°C, taken
out, and thrown into a large bucket of cold water.
Would that sort the bad stuff from the proper Pyrex glasswear?
Dann2
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User
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Well the fact that crappy glass would never survive this might conclude something, still would you really boil liquid in it that boils beyond 300
degrees, i certainly would feel unconfortable.
Well even though pyrex might be sucky, I still use some glass in my lab that isnt boro or anything similar , I just dont stress it as much as the
stuff i know it can deal with it.
Also i would never use old glassware for scary operations.
Its just a matter of thinking before doing.
What a fine day for chemistry this is.
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Formatik
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Quote: Originally posted by dann2  | Hello,
For the (perhaps) dodgey 'Pyrex' home cook glasswear a test could be done whereby the vessel is put into an oven and heated to 200°C, taken
out, and thrown into a large bucket of cold water.
Would that sort the bad stuff from the proper Pyrex glasswear?
Dann2 |
I would expect most glass to break under that condition. I was heating a 1L flask some time ago (Schott glass mind you, though several years old) on a
hot plate (it reaches around 500 deg. and above), and just after removing the flask and setting it on a surface (not cold, but cooler than the hot
part) and it cracked immediatley. The heat resistance of household glassware depends on its designated use (borosilicate glass tea containers) or
glass pots for heating food on the stove. Compared to bakeware like Pyrex I would expect those to be much more thermally stable.
Here is a statement about Pyrex glassware from their website:
| Quote: | Avoid Sudden Temperature Changes to your Glassware. To avoid the risk of breakage due to a sudden temperature change to your Pyrex
glassware, DO NOT add liquid to hot glassware, place hot glassware on a wet or cool surface, or handle hot glassware with a wet towel, wet potholder
or other wet cloth. ....
DO NOT Use On or Under a Flame or Other Direct Heat Source, including on a stovetop, under a broiler, on a grill or in a toaster
oven. |
http://www.pyrexware.com/index.asp?pageId=104
[Edited on 21-5-2009 by Formatik]
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dann2
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Hello,
Some info. here regarding Simax glass.
Dann2
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CHRIS25
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Not all Pyrex is made from Borosilicate
I was thinking (for the time being) to use a pyrex jug for one of my reactions which is exothermic. But upon doing some instinctive research I was
horrified to read that the company who took over Pyrex (World Kitchen) use hardened soda lime and still call this pyrex.
As I have researched and found that hardened soda lime is well... harder than standard soda lime glass. But the fact remains that it seems I would
not be able to trust a cookware jug with the pyrex label, because it is not really the borosillicate composition.
Is all this true. Only asking because I do not have any chemistry beakers at this moment and for a small reaction I thought that buying a pyrex jug
would be ideal just for the moment.
‘Calcination… is such a Separation of Bodies by Fire, as makes ‘em easily reducible into Powder; and for that reason ‘tis call’d by some
Chymical Pulverization.’ (John Friend, Chymical Lectures London, 1712)
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. (William Penn 1644-1718)
The very nature of Random, Chance development precludes the existence of Order - strange that our organic and inorganic world is so well defined by
precision and law. (me)
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hissingnoise
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| Quote: | | I thought that buying a pyrex jug would be ideal just for the moment. |
Today's pyrex jugs are made of tempered soda-lime and won't withstand sudden changes in temperature as borosilicate will . . .
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Funkerman23
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Pyrex still only uses borosilicate glass for their labglass line but all of their cookware has changed over to the hardened soda lime/"tempered" glass
for some unknown reason. all I know of are rumors as to why they did that( so sadly I cannot offer concrete reasoning other than I have confirmed the
cookware isn't the usual borosilicate) but if you buy their flasks, beakers and other labware then you can rest easy.
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watson.fawkes
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The phrase "Pyrex uses" is nonsense. Pyrex is a brand name, not a company. The
original trademark was owned by Corning. Corning sold off the rights to the brand name for retail cookware sold in the US a few year ago. At the time,
they hadn't done so for all global markets, though I don't know what the status is for that now. Corning still sells labware with the Pyrex name.
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Fossil
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When World Kitchen took over the Pyrex brand, it started making more products out of prestressed soda-lime glass instead of borosilicate. This was
done to save money, lower prices, and to cut down on manufacturing costs. The soda lime they use now is pre-stressed from the inside, although when
you heat it, it still expands like regular soda lime glass would. It wont shatter immediately, but it can only expand up to a point until the
inner-stress is too strong.
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CHRIS25
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thanks Fossil, off to order some proper glass now!!!
‘Calcination… is such a Separation of Bodies by Fire, as makes ‘em easily reducible into Powder; and for that reason ‘tis call’d by some
Chymical Pulverization.’ (John Friend, Chymical Lectures London, 1712)
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. (William Penn 1644-1718)
The very nature of Random, Chance development precludes the existence of Order - strange that our organic and inorganic world is so well defined by
precision and law. (me)
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Fossil
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Good! I almost made the same mistake once, nearly used a 1 liter pyrex measuring cup for a high temperature oil bath. Good thing I didn't, would have
been quite the mess!
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chucknorris
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Just blew up a process when heating (luckily powder form) stuff by using the flat PYREX jug. The heating was likely OK, but when I took it off, the
bottom fell off. For 4 years have had 4 of these items and I managed to crack all of them in normal processes, but got my money back from the shop.
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nerdalert226
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Thats crazy! how do they pass off pyrex as hardened soda lime!?
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Nicodem
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10-5-2012 at 08:50 |
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