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Author: Subject: so much bubbles in glass
dioxine
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[*] posted on 21-5-2021 at 06:17
so much bubbles in glass


Well, i had some glass from china that was not that bad, but with some defects so i decided to buy some glass from local russian store which was(as i thought) reliable. I thought it will be russian manufacturer like "Klin" which is good. When glass came what i saw is literally chinese glass with russian label on it. And it has so much bubbles!

It is that bad for regular use? (Not for vaccum or something like that). Photos attached.



[Edited on 21-5-2021 by dioxine]

[Edited on 21-5-2021 by dioxine]
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njl
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[*] posted on 21-5-2021 at 06:23


I'd really avoid putting much stress on that joint, and distillations where the vapor front moves slowly and has a high temperature gradient. For example taking off a high boiling solvent where a very hot vapor front moves discretely up the stillhead and heats one side of the joint before the other.



Reflux condenser?? I barely know her!
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dioxine
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[*] posted on 21-5-2021 at 06:25


Thanks nij. Think i should try this one with water distillation to see if something will happen.
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zed
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[*] posted on 25-5-2021 at 21:38


Ummm. I'm in the USA.

I assume that the expensive high quality American Glassware, available here... Is actually made in China.

The American Corporations involved, pay slightly more, and exercise stringent quality control.

If you are paying a premium for "Russian" Glassware, you should be getting premium Russian Quality.

We buy plenty of Chinese Glassware around here. Quality isn't really great, but it is dirt cheap. Which is OK.

Not OK, is expecting high quality, and getting glassware full of bubbles.

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draculic acid69
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[*] posted on 26-5-2021 at 01:52


Send it back and tell them it's unnaceptable. Try and get a refund
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dioxine
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[*] posted on 8-6-2021 at 11:45


our amauter-chemists market is really that small so there is only few shops and they often don't care about quality or service so this is gonna be waste of my time if i try to send it back.
No choise really, there is no different shops with "Premium" quallty.

[Edited on 8-6-2021 by dioxine]
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unionised
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[*] posted on 9-6-2021 at 02:57


It's obviously not ideal, but that glassware survived the thermal gradients involved in the manufacturing process.
So it is quite likely to survive those encountered in use.
Also, glass is a lot stronger and more flexible than most people give it credit for.


And
Quote: Originally posted by dioxine  
When glass came what i saw is literally chinese glass with russian label on it.



Do you know what "literally" means?
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Clear_horizons_glass
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[*] posted on 25-6-2021 at 09:46


Scientific glassblower here. If ya want something made without bubbles, message me. That apparatus looks easy enough to replicate.



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