RogueRose
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Rotary joints for rotovap - what do they look like?
I've been looking at some of the pictures of rotovap's and through some of the sites that sell parts for them and it is a little confusing as to what
the joint looks like that spins. I'm guessing it is glass on glass or do they also make PTFE joints?
I have seen the ball and socket joints which would seem like they would work well for rotation.
![Ball_and_socket_ground_glass_joints.PNG - 4kB](https://www.sciencemadness.org/whisper/files.php?pid=522579&aid=69039)
But on this page the flasks and items with this joint are labeled "reveiver" flasks which are the collection flasks, which seems odd IMO.
https://www.laboratory-equipment.com/lyophilizers-evaporatio...
Are there any special joints that are used specifically for rotovaps or a specific taper?
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Ubya
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they don't use glass on glass for the rotating part i think, i've never seen a dismantled rotovap but searching on the web i found they they use a
mechanical rotating seal
![z563625-medium.jpg - 9kB z563625-medium.jpg - 9kB](https://www.sciencemadness.org/whisper/files.php?pid=522633&aid=69048)
maybe you could use the joint used for mechanical stirrers to do a similar job
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coppercone
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the type of bearing will or should be different in a rotovap vs a overhead stirrer, since the force is completely downwards on a stirrer and at a
shallow angle for a evaporator, this means your failure rate on the joint and wear on the bearing will be different and not well suited.
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wg48
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Quote: Originally posted by RogueRose ![](images/xpblue/lastpost.gif) | I've been looking at some of the pictures of rotovap's and through some of the sites that sell parts for them and it is a little confusing as to what
the joint looks like that spins. I'm guessing it is glass on glass or do they also make PTFE joints?
I have seen the ball and socket joints which would seem like they would work well for rotation.
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They do use special joints frequently but they also use those glass ball and socket joints for all glass sytems.
See the pic below. C is the ball and socket rotating joint.
![rotavap-1.jpg - 40kB](https://www.sciencemadness.org/whisper/files.php?pid=522721&aid=69069)
Sorry I can not find the document I clipped the above crappy pic from. If you search for "all glass rotavap" you will probably find it or something
similar.
Borosilicate glass:
Good temperature resistance and good thermal shock resistance but finite.
For normal, standard service typically 200-230°C, for short-term (minutes) service max 400°C
Maximum thermal shock resistance is 160°C
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