Heavy Walter
Hazard to Others
Posts: 127
Registered: 17-12-2015
Location: Argentina
Member Is Offline
Mood: No Mood
|
|
Sleeve septa
Hi
I would be glad to know your experience with this kind of septa.
Some comments on the web argue they doesn't seal well in many situations.
|
|
|
Mabus
Wiki Master
Posts: 238
Registered: 3-11-2013
Member Is Offline
Mood: Energetic
|
|
Rubber septa are only for temporary use, like when you're adding an air-sensitive reagent in a reaction flask, and to limit air contamination, it's
best to keep the inert gas flowing when using them. They are not very good for storage bottles, exception for air-sensitive reagent bottles (ex:
organolithium solutions) which also have an outer main cap.
|
|
|
Sigmatropic
Hazard to Others
Posts: 307
Registered: 29-1-2017
Member Is Offline
Mood: No Mood
|
|
I've recently used a septa on a vessel under relatively high vacuum (during freeze-pump-thaw cycles) and could not detect any leakage at ~0.1 mbar.
Although preferably I'd use a glass stopper in most cases I sometimes opt for a septum because the risk of introducing the lab atmosphere during
sampling is lower.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
