First time sealing glass jar

[alivd]

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[FifDeez]

Lol

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[alivd]

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[jusbag]

UV glue it?

[alivd]

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[sk,,,]

What are you sealing inside? If you are just trying to do this once or twice, it might be easier(cheaper) to have someone seal it for you.

[alivd]

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[alivd]

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[PyroChixRock]

Can you show us a pic of one you've tried, even though you said it was unsuccessful?

[alivd]

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[Jackass Glass]

do you have a kiln? or are you just bench cooling when done?

[Joe Userton]

do you have a kiln? or are you just bench cooling when done?

He is trying to seal in a large volume of water and live cells, the kiln isn't going to work here.


This project sounds like a an oversized Ampoule. I doubt you are going to be able to buy something, because what you need is an incredibly specific shape, but you could get a tube of glass and blow your own to the size you want.

On that note, you would have much better results using borosilicate glass rather than the soda glass used in most commercial glass, because is it is much less sensitive to heat changes and won't be so prone to breaking from heat shock.

[alivd]

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[mtownglassart]

I have thrown away all of them. I am trying again tomorrow so I will send a pic then.
Get a piece of large standard wall tubing put what you want inside. Heat it at an angle so the stuff will not fall out. It will seal and whatever is inside is good to go. Done. Have a great time exploring. If you want an example pm me.

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[sk,,,]

How big does the opening need to be? Maybe you could find something already sealed, then melt a small hole. That small hole might be easier to seal up.

[mtownglassart]

How big does the opening need to be? Maybe you could find something already sealed, then melt a small hole. That small hole might be easier to seal up.
Would need to be boro tho so it would seal right

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[alivd]

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[mtownglassart]

Looks easy enough to seal. Don't heat to much so that it caves in really far. It doesn't have the outside diameter (OD) on the site you found it?

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[alivd]

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[mtownglassart]

Sounds good. The second sealing is the one that will want to cave in. If you have a tool to pull it you should be ok.

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[Jimi The Don]

if the seal begins to cave in (vacuum sucks in the hot glass) , heat behind the seal a little bit (heats and expands the air inside), then focus the flame on the caved in end and it'll blow back out.

but pulling it out will work, may be slightly pointed in the end after you melt it in. you can get the end that you're sealing melted but not yet closed and pinch it closed with the flat part of your tweezers (pinch seal), then flame anneal. an pipette is usually pretty thin, so it may very well survive without cracking.

a 25ml pipette is usually around 22mm or so diameter, and a couple inches tall.

pinch seals are used a lot in glass to metal seals and when you need to seal gel or liquid inside of something. sometimes if you're not careful when sealing something like this and you have too much heat right behind the seal when it closes, it'll blow out a thin bubble that will break, or it'll collapse as stated previously. pinching it closed allows you to seal it before the vacuum sucks it in, or the expanding gasses blow it out (if it's too hot).

[alivd]

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[Joe Userton]

Thanks for all the info, so I'm basically going to follow this tutorial,
https://youtu.be/7hRPs64NOf8

That looks perfect, should work for what you want to do.


I have been doing my torch stuff outside with wind blowing and sub zero (C) temperatures could that interfere with the process it seems like whenever there's wind I can't get the glass red hot. Could there be some truth to this?

Sure, for multiple reasons.

First thing, the wind is going to interfere with your torch's flame, if it's blowing around and unsteady, it won't be as hot. Second, that cold wind hitting the glass is pulling heat away. The faster it is blowing and the colder it is, the more your glass is going to be cooling as you are trying to heat it.

[alivd]

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[metalbone]

if this is not a joke thread, then attach a small diam air tube to the pipette and seal that off after you do the main seal...just like sealing a neon tube. This will avoid the cave in on the main body.

[alivd]

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