malford
Hazard to Others
Posts: 116
Registered: 17-6-2013
Member Is Offline
Mood: No Mood
|
|
Crooked Pyrex Glassware
Hello, below is part of my distillation setup. You can see that I have two Pyrex adapters connected and that the fractionating column is terribly
crooked due. Is this normal for high-quality glassware to be this crooked or does this indicate counterfeit products?
<img src="http://i.imgur.com/98LJvbB.jpg" width="800" />
<!-- bfesser_edit_tag -->[<a href="u2u.php?action=send&username=bfesser">bfesser</a>: reduced
image size(s)]
[Edited on 16.8.13 by bfesser]
|
|
|
bfesser
Resident Wikipedian
Posts: 2114
Registered: 29-1-2008
Member Is Offline
Mood: No Mood
|
|
It happens. Just because your joints are stamped Pyrex® doesn't mean that the final product is manufactured by Corning. Your adapters may
have been made by or repaired by another glassblower at one time. Also, I've seen original glassware where the angles are a bit off. It's usually
not a problem.
[edit] To me, it looks like the distillation adapter on top of your Vigreux column was made by another glassblower.
[Edited on 16.8.13 by bfesser]
|
|
|
malford
Hazard to Others
Posts: 116
Registered: 17-6-2013
Member Is Offline
Mood: No Mood
|
|
So, let's assume that my products are stamped Pyrex because they were manufactured by Pyrex and not altered by a bad glassblower...
In such a case, can deviations this large be expected from high quality glassware? The first connector I purchased was off so I returned it, but not
nearly this much. This is impardonably poor glassware.
|
|
|
watson.fawkes
International Hazard
Posts: 2793
Registered: 16-8-2008
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by malford  | So, let's assume that my products are stamped Pyrex because they were manufactured by Pyrex
[...]
In such a case, can deviations this large be expected from high quality glassware? |
They're stamped Pyrex
because standard taper joints, both male and female, are sold as pre-fabricated parts to glassware manufacturers. The stub on the joint is sealed to
whatever ware the glassblower is making. A lot of glassblowers no longer even have the gear to grind a taper, not even to touch one up. The pre-formed
versions are inexpensive enough that it's generally cheaper to cut off a damaged one and replace it.
It looked like you've mated a 60° adapter to a 75° adapter. It's hardly a wonder that the column is not vertical.
|
|
|
subsecret
Hazard to Others
Posts: 424
Registered: 8-6-2013
Location: NW SC, USA
Member Is Offline
Mood: Human Sadness - Julian Casablancas & the Voidz
|
|
Those glassware pieces shown are generally angle-specific. There are different ones made with different angles. Did you buy glass with the
same/supplementary angles?
Fear is what you get when caution wasn't enough.
|
|
|
malford
Hazard to Others
Posts: 116
Registered: 17-6-2013
Member Is Offline
Mood: No Mood
|
|
I thought so too, but my 105 degree adapter does not align properly with what the apparent 75 degree adapter. My days of purchasing from ebay are
finished.
How does Chemglass compare to LabGlass in terms of quality? My main concern at this point is everything lining up very close to perfect.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
