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Author: Subject: Ground glass quartz tube
plante1999
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Ground glass quartz tube

Does anyone know where a tube, made of quartz and that have ground glass joint, is sold? A tube much like garage chemist one: http://www.sciencemadness.org/talk/viewthread.php?tid=10564

Thanks!

I never asked for this.
Mixell
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They are usually done on demand, I'm also searching for one.
Mailinmypocket
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Same here... I have a large quartz test tube but have had an impossibly difficult time finding a glass blower that does quartz/jointed connections. I've gotten by with cramming glass wool tightly between the quartz and boro glass but its far from practical
Lambda-Eyde
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http://www.technicalglass.com/ - I'd estimate 25-40for a tube with a joint. Edit: For a tube like GC uses in that thread, you'd obviously have to fork out more. Also keep in mind what he says about joints - a quartz female and a borosilicate male will crack! [Edited on 17-4-2013 by Lambda-Eyde] This just in: 95,5 % of the world population lives outside the USA You should really listen to ABBA Please drop by our IRC channel: #sciencemadness @ irc.efnet.org Magpie lab constructor Posts: 5939 Registered: 1-11-2003 Location: USA Member Is Offline Mood: Chemistry: the subtle science. Here's a supplier of quartz tubing. They will also do glassblowing and ground glass joints. It may take some coaxing for small jobs, however. http://www.quartz.com/quartz.html The single most important condition for a successful synthesis is good mixing - Nicodem bahamuth National Hazard Posts: 384 Registered: 3-11-2009 Location: Norway Member Is Offline Mood: Under stimulated  Quote: Originally posted by Lambda-Eyde Also keep in mind what he says about joints - a quartz female and a borosilicate male will crack! Spherical joints will do the trick, joining borosilicate and quartz. Any sufficiently advanced technology is indistinguishable from magic. garage chemist chemical wizard Posts: 1803 Registered: 16-8-2004 Location: Germany Member Is Offline Mood: No Mood Even a quartz male and borosilicate female will crack- if they get hot and are left to cool while assembled. Such a combination must be disassembled while still hot to avoid cracking, as I found out. Only spherical joints are truly safe for combining quartz and borosilicate, although you can get away with conical joints if you follow the advice I just gave. Go to a university glassblower and ask whether he can make such a tube for you. Don't get put off by the price, I paid a bit more than EUR 100 for mine. Custom made glassware has its price. www.versuchschemie.de Das aktivste deutsche Chemieforum! Dr.Bob International Hazard Posts: 2327 Registered: 26-1-2011 Location: USA - NC Member Is Offline Mood: No Mood The company below is a quartz specialist, and is in NC, so ever better (for me.) I would call them for a quote. They are smaller and might even work with individuals, but not sure. Also, chemglass has made a few simple quartz items for me in the past, at reasonable prices. http://prismresearchglass.com/ turd International Hazard Posts: 800 Registered: 5-3-2006 Member Is Offline Mood: No Mood Jeeez! You are not talking about quartz. Fused silica a.k.a. fused quartz is - by definition - not quartz. Quartz glass is an oxymoron but acceptable. Quartz is wrong - and not a single person in this thread got it right. Mixell National Hazard Posts: 449 Registered: 27-12-2010 Member Is Offline Mood: No Mood The usually acceptable term is fused quartz. Fused silica usually refers to this type of items: http://www.ebay.com/itm/Melting-Crucible-for-Gold-Silver-Bra... unionised International Hazard Posts: 4626 Registered: 1-11-2003 Location: UK Member Is Offline Mood: No Mood "Only spherical joints are truly safe for combining quartz and borosilicate," Why? Hexavalent International Hazard Posts: 1564 Registered: 29-12-2011 Location: Wales, UK Member Is Offline Mood: Pericyclic  Quote: Originally posted by unionised "Only spherical joints are truly safe for combining quartz and borosilicate," Why? Perhaps due to differences in coefficients of expansion? "Success is going from failure to failure without loss of enthusiasm." Winston Churchill watson.fawkes International Hazard Posts: 2793 Registered: 16-8-2008 Member Is Offline Mood: No Mood  Quote: Originally posted by Hexavalent Perhaps due to differences in coefficients of expansion? Yes. The thermal coefficients vary by a factor of six. Spherical joints are the not only joint geometries that are possible, merely the most common and standard ones. Flanged joints, with gasket and retaining clamp, would work just as well. turd International Hazard Posts: 800 Registered: 5-3-2006 Member Is Offline Mood: No Mood  Quote: Originally posted by Mixell The usually acceptable term is fused quartz. Fused silica usually refers to this type of items: http://www.ebay.com/itm/Melting-Crucible-for-Gold-Silver-Bra... At least in the scientific literature that I'm aware of fused silica is generally translucent material used to make ampoules or other reaction containers. And nobody I know uses these opaque silica crucibles - it's mostly Al2O3 if oxides are OK. The distinction between fused quartz and fused silica is a bit silly - after all quartz is a form of silica and chances are high that what you call fused silica is made from quartz sand. But all this is besides the point. The actual point is: whether you call it fused silica or fused quartz or quartz glass - it's bulk amorphous SiO2, whereas quartz designates a set of crystalline SiO2 polymorphs. So don't call your tubes quartz tubes, because every time you do god kills a kitten. Mixell National Hazard Posts: 449 Registered: 27-12-2010 Member Is Offline Mood: No Mood Well, I'll need to in order to purchase some... unionised International Hazard Posts: 4626 Registered: 1-11-2003 Location: UK Member Is Offline Mood: No Mood I know why you can't use a tapered joint with two different materials if their expansion coefficients don't match. (and, incidentally, it's not the ratio of the expansions that matters so much as the difference) What I'd like someone to explain is how a spherical (well, hemispherical really) joint will work any better. They are useful in that you don't need to align them so carefully but, as far as I can tell, if the ball expands more than the socket then the socket will snap and if the socket expands more than the ball then the joint will leak. [Edited on 20-4-13 by unionised] turd International Hazard Posts: 800 Registered: 5-3-2006 Member Is Offline Mood: No Mood  Quote: Originally posted by Mixell Well, I'll need to in order to purchase some... ??? I think I didn't get my point across: "fused quartz tube" = good. "quartz tube" = just wrong. If a vendor uses the latter I would not trust him - he doesn't know what he's selling. watson.fawkes International Hazard Posts: 2793 Registered: 16-8-2008 Member Is Offline Mood: No Mood  Quote: Originally posted by turd "fused quartz tube" = good. "quartz tube" = just wrong. If a vendor uses the latter I would not trust him - he doesn't know what he's selling. Well, given that some old-line vendors aren't pedantic about repeated the word "fused" everywhere, I don't see why there such a need to be pedantic about it here. All these vendors say "fused quartz" sometimes and just "quartz" sometimes. National Scientific Company, whose URL is quartz.com. Precision Electronic Glass GM Associates These vendors all appear on the ASGS Buyer's Guide page (the ASGS is The American Scientific Glassblowers Society); it was a handy place from which to pull a number of examples. Fleaker International Hazard Posts: 1240 Registered: 19-6-2005 Member Is Offline Mood: nucleophilic I have about 300 quartz tubes that I bought and were the wrong size. They're 26X30 mm Heraeus (basically their version of GE214). Each is 1200 mm or so in length.20/a piece.

Neither flask nor beaker.

"Kid, you don't even know just what you don't know. "
--The Dark Lord Sauron
plante1999
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Do you mean they are oval? Are they ground quartz(ground glass)?

I never asked for this.
Morgan
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He means 2mm wall thickness. That's a lot of quartz tubing to buy and the wrong size. And I thought I bought a lot buying 3 boxes (15 per box) Heraeus quartz tubes just because they were cheap and I like materials science. Quartz has so many good qualities.
Mixell
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The price is good, but it will probably be a hassle to ship.
unionised
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I'd still like too know why Garage Chemist thinks spherical joints are OK with mis-matched expansion coefficients.
turd
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 Quote: Originally posted by watson.fawkes Well, given that some old-line vendors aren't pedantic about repeated the word "fused" everywhere, I don't see why there such a need to be pedantic about it here.

If it is pedantic not to designate things with words that have a completely different meaning then I will take it as a compliment. Also this must be one of the worst appeal to authority arguments ever. If at least you would have bothered to find something in the scientific literature. For me it is like calling hydrochloric acid "HCL": Do it once it's a typo, do it consistently you're an ignorant, be proud about your ignorance and you're a "kewl". Unfortunately the standard enforced in the organic chemistry subforum is not maintained for other topics.

 Quote: I'd still like too know why Garage Chemist thinks spherical joints are OK with mis-matched expansion coefficients.

I suppose the idea is that the force of expansion is not only exerted in transversal direction leading to wedging and consequently breaking but also in longitudinal direction leading to a sliding apart.

In any case I don't buy the problem. The real solution is to not heat the joints. I know a group that does *many* evacuated fused silica ampoules, the last part of a tube being molten ~2-5 cm from the joint. Due to the low thermal conductivity the only breaking of joints was during cleaning. And no, the remaining tubes are not removed while still hot. I've seen a few of these setups and never anything but conical joints. The fused silica is always male, of course.

The same people regularly do reactions in a fused silica tube in a tube furnace typically at 1100°C under vacuum, H2 and Ar and not once in several years a joint has broken. If your joints break you are doing something wrong or your glass is of bad quality.

 Sciencemadness Discussion Board » Fundamentals » Reagents and Apparatus Acquisition » Ground glass quartz tube Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Test Forum