Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Solid glass stopper or empty glass stopper?
National Hazard

Posts: 669
Registered: 25-11-2011
Location: Canada
Member Is Offline

Mood: autoerotic asphyxiation

[*] posted on 13-11-2016 at 05:56
Solid glass stopper or empty glass stopper?

Solid glass stopper or empty glass stopper?
Which one is better?

My glassware is 24/40 in size.
I prefer "penny head" stoppers.

Signature ==== Is this my youtube page?
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
Yes my evolutionary friends. We are all homos here.
View user's profile View All Posts By User
International Hazard

Posts: 3577
Registered: 8-2-2015
Location: 3rd rock from the sun
Member Is Offline

[*] posted on 13-11-2016 at 06:29

I like cheap hollow stoppers
with a flat top that allows me to put it down, with no contamination,
freeing one hand.
Solid glass is heavier so vents at higher pressure,
solid glass stoppers chip and can usually continue service ....

EDIT: also, hollow stoppers have less thermal mass, which makes distillation a little more precise ?

[Edited on 13-11-2016 by Sulaiman]

CAUTION : Hobby Chemist, not Professional or even Amateur
View user's profile View All Posts By User

Posts: 6236
Registered: 4-10-2014
Location: Unmoved
Member Is Offline

Mood: Organised

[*] posted on 13-11-2016 at 15:10

I only have hollow stoppers with a flat hexagonal top. I agree that being able to stand them upside down on end is useful.
Somehow the lack of weight feels wrong -- especially when I am washing up and they float.

View user's profile View All Posts By User

Posts: 39
Registered: 16-6-2016
Member Is Offline

Mood: Highly Nitrated

[*] posted on 13-11-2016 at 17:40

Solid glass, because if you drop them, there is a littler chance they will break into a million pieces. Also, if they do chip, you (most likely) will still be able to use them.
View user's profile View All Posts By User
International Hazard

Posts: 2667
Registered: 26-1-2011
Location: USA - NC
Member Is Offline

Mood: No Mood

[*] posted on 13-11-2016 at 18:32

If you are mailing them overseas, then hollow is better, otherwise I use them interchangeably. There are a few times one is better than the other, but no big deal, I often give people a few of each in kits or purchases, as that way they can use whichever is best. The penny heads are easier to wire down or hold sometimes with wet hands. I have seen at least 10 shapes and sizes of 24/40 stoppers alone, several varieties of hex top, square top, round top, and a few others in hollow, and penny top, flat round top, and huge flange to grab hold of and way heavy solid ones.
View user's profile View All Posts By User
International Hazard

Posts: 2532
Registered: 26-12-2012
Location: Boston, MA
Member Is Offline

Mood: Double, double, toil and trouble

[*] posted on 14-11-2016 at 05:14

I would just get whichever kind is cheaper, since they're pretty much functionally equivalent.

As below, so above.

My blog:
View user's profile View All Posts By User

  Go To Top