Sciencemadness Discussion Board

Ground glass compatibility

enkephalin - 24-12-2005 at 05:11

Could 24/29 (european) joints be used with 24/40 (american) joints? the only difference is the length of the joint i think, the width and angles are the same.... thanks.

chochu3 - 24-12-2005 at 11:13

It is possible, use a keck clamp to make sure it does not blow out of the hole when heating. I use a 19/24 stopper in my 19/22 3 neck flask and have had no problem when heating as long a keck clamp is in place.

enkephalin - 25-12-2005 at 04:02

Thanks for the help.

Mush - 11-4-2015 at 06:34

Is 14/20 joint compatible with 14/23?

gdflp - 11-4-2015 at 07:38

Yes, as long as the first number is the same, the joints are typically compatible.

macckone - 11-4-2015 at 08:05

This topic comes up frequently.
Shorter male joints fit nicely in longer female joints.
However longer male joints will only fit in shorter female
joints if there are no interfering parts beyond the joint.
Often the glass beyond the joint is narrower and you
get interference, especially on lower quality glassware.

gdflp - 11-4-2015 at 08:20

Quote: Originally posted by macckone  
This topic comes up frequently.
Shorter male joints fit nicely in longer female joints.
However longer male joints will only fit in shorter female
joints if there are no interfering parts beyond the joint.
Often the glass beyond the joint is narrower and you
get interference, especially on lower quality glassware.


I could see how that would be an issue with more complex pieces of glassware, but for most simple glassware; flasks and straight condensers and such, I have never had an issue with this. It also depends on how different the lengths of the joints are. In most cases, I doubt that 3mm is going to cause any trouble.

Mush - 11-4-2015 at 09:23

Thanx guys!
Would it be okay even for vacuum distillation?

Loptr - 11-4-2015 at 09:55

What size TS glass stoppers are used with each? I thought TS27 went with 24/40, but I have some that are definitely larger. They are Pyrex brand, so do they differ amongst manufacturers?