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

Printable Version  
Author: Subject: Glassware repair tip ?

Posts: 3
Registered: 24-12-2020
Member Is Offline

[*] posted on 13-9-2023 at 02:57
Glassware repair tip ?


I have this Dean-Stark trap that I got some times ago. On arrival, it had that "star break"-like cracks (images following).

I successfully used it to extract some essential oils at low heat once to test it but I would not use it for it's real purpose until repair.

I have some knowledge and experience with glass working. I'm wondering what would be the best way to repair this piece of glassware: can it be repaired by just heating the specific area + around until the cracks are gone or I would have to anneal the whole piece afterward ?

Yours truly,

Edit: it would be better with the images :cool:

IMG_6165.jpg - 2.9MB IMG_6170.jpg - 1.7MB IMG_6172.jpg - 1.7MB

[Edited on 13-9-2023 by proculation]
View user's profile View All Posts By User
International Hazard

Posts: 3237
Registered: 13-7-2003
Location: Wisconsin
Member Is Offline

Mood: Rock n' Roll

[*] posted on 13-9-2023 at 03:40

One question is what are you going to gain out of it? If you are not running under vacuum then the chances of catastrophic failure are cut and considering you're not messing with pyrophorics from what it sounds like then the danger of said failure is also somewhat low.

That being said, this is the sort of repair that chemists have been tackling on their own for the better part of a century. Though there is a very real chance you could ruin the glassware. There have been times I've attempted this sort of repair and upon heating the crack spreads. Other times I've head sufficiently but the crack will not come together. And at other times I have had success. There is a bit of technique to these smaller repairs of wafting the torch over the are to bring it slowly up to temp and then slowing the cooling by doing the same to give it an 'annealing blessing'.

Again, you might be able to keep using as is, I think the greater risk will be trying to fix it in your case. But honestly I would probably give it a go just to get the experience so long as you know what you are getting into.

Shamelessly plugging my attempts at writing fiction:
View user's profile Visit user's homepage View All Posts By User
Hazard to Others

Posts: 375
Registered: 23-9-2016
Location: Oztrayleeyah
Member Is Offline

Mood: Wavering between lucidity and madness

[*] posted on 13-9-2023 at 15:02

I've done a few vids on glassblowing for the absolute beginner, and aimed at those who need to repair small cracks like this in their glassware.
I focus on using techniques that don't need any more equipment than just a bunsen burner and a few low tech hacks. It will be limited in what you can achieve with this technique but your problem seems a perfect example of when to use it.

Healing a crack
Glassblowing with a bunsen burner

I can answer any questions you might have about set ups and techniques
View user's profile View All Posts By User

  Go To Top