bob800
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buying used glassware
I was looking on ebay for a distillation kit, and found this one for only $82. The seller has 100% feedback, and the glass is Corning/Kimble.
The only drawback is that the glass is used. What are your opinions about buying used glassware? Would you put in under vacuum, only use it for low
temps., or never use it?
Apparently, the used glassware it put through an annealing oven to burn off organics. Do you think that a normal cleaning would dissolve anything else
that would be a problem?
Any advice\opinions would be greatly appreciated.
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S.C. Wack
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With free shipping; it's a fair price for a full used student 19/22 set. If I didn't already have 19/22 sets maybe I'd buy one myself, if "Pyrex
glass" means used glassware that was blown by Corning. If it means borosilicate glass supplied by them but blown by him, and used, well I don't know
but I haven't heard anything bad about his glass here without U'ingTFSE. But then some people here rave about "really thick!" Chinese glassware (do
not trust heated thick glassware with dangerous chemicals).
Great to get used glassware that's been annealed in any case.
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bob800
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I had the same question, and he replied, "The glassware is made with Corning or kimble brand Boro glass". Does this mean that it was blown by
Corning/Kimble, or that he blew it but used raw material from Corning?
Quote: Originally posted by S.C. Wack  |
But then some people here rave about "really thick!" Chinese glassware (do not trust heated thick glassware with dangerous chemicals).
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What's wrong with thick glassware, I thought thicker glassware was less likely to break? Does this apply for heavy-walled flasks as well?
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S.C. Wack
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The thicker it is the less stable it is to thermal stress. Personally I wouldn't buy anything from anyone trying to disguise the manufacturer.
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psychokinetic
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There's a sweet spot - too thin and it'll fall apart, too thick and it will crack.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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spirocycle
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can you put a number on that sweet spot?
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psychokinetic
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4.
(No. I wouldn't have a clue what units to use  )
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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S.C. Wack
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Name.
Ace, Corning, Kimble, Wheaton, etc.
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spirocycle
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i was thinking in mm thickness
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psychokinetic
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You need to take quality into account, really. Thin well made glass could be better than thicker crappily made glass, for instance.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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bahamuth
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Best ground taper glass I've been using is Kontes, with Chemglass just as good. Ace also is great, but do not like the design on some of their
pieces..
For other glass, like filtering flasks, E-flasks vol. flasks etc. Kimble/Kimax/Pyrex, Schott Duran, Assistent are great brands. Never used the cheap
stuff.., rather not buy something than looking like two-face from a exploding/imploding RB flask, or even worse, die from exposure to the content....
Love the Kontes Bantam-Ware series...
Any sufficiently advanced technology is indistinguishable from magic.
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