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Where to buy large glass tubes? Answered

I need several glass tubes (10-20) that are around 30-40mm in diameter and 6 feet long. They also can't be rediculously expensive, I've been searching for a while, but all I've been able to find is glass with a length of 4 feet and a diameter of like 10mm. Any help?

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Gjdj3
Gjdj3

11 years ago

The real question is, what for?

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Gjdj3
Gjdj3

Reply 11 years ago

Scratch that, I found the comment explaining it.

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Sandisk1duo
Sandisk1duo

11 years ago

you can get a 1inch diameter tube if you empty out florescent lights

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gmoon
gmoon

Reply 11 years ago

This jogged an old memory. Mother's Energy Efficiency Book, 1983, Mother Earth News, has an article about using discarded fluorescent tubes as collector pipes.

The article describes making a "tube cutting tool," wrapping a short length of .034 in. stainless steel wire around the tubes, then energizing with a 12V car battery. When the glass cools, it does so unevenly and breaks cleanly at the heated line...

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Sandisk1duo
Sandisk1duo

Reply 11 years ago

it would be best to first score the glass, then get the wire cutting tool

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gmoon
gmoon

Reply 11 years ago

I dunno, never tried it. The author probably cut hundreds of tubes to arrive at the technique (his collector panels used 29 tubes each.) Scoring doesn't seem necessary; the wire melts into the surface. Other techniques would work, for sure. He also recommends filling the tubes with sandblasting sand and tip repeatedly to remove the inner coating...

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guyfrom7up
guyfrom7up

Reply 11 years ago

what should I do about the mercury? I need 16 tubes, and one isn't that big of a deal, but 16 seems to be a little dangerous. I don't want any drain bramage xD

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Sandisk1duo
Sandisk1duo

Reply 11 years ago

just make sure you empty them out carefully, maybe wear a mask

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lemonie
lemonie

Reply 11 years ago

The glass is very thin, it is very likely to be unsuitable for the high-vac work guyfrom7up wants to do.

L

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Sandisk1duo
Sandisk1duo

Reply 11 years ago

he was going to make "giant nixie bargraph displays"

i'm pretty sure that nixie tubes have some gas inside

however , i could be wrong

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guyfrom7up
guyfrom7up

Reply 11 years ago

well, yeah, but in the process of making them pressures get down to below 1x10-2 torr, and whenever filled with gas they are around 5-12 torr. The glass does seem really thin for doing something like this, but they have to do this in the process of making them, so I don't know...

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lemonie
lemonie

Reply 11 years ago

I'm not convinced that regular fluorescent tubes are pumped down as far as 10-2 torr.
On another note - do you have any experience blowing glass?

L

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guyfrom7up
guyfrom7up

Reply 11 years ago

i have expierience not blowing glass, if that was another question xD I can't roll by own tubes, if that's the second.

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lemonie
lemonie

Reply 11 years ago

It was the techniques required to seal the tubes I meant, it's a bit tricky. You might be wise to play with cheap glass a bit before buying anything.

L

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guyfrom7up
guyfrom7up

Reply 11 years ago

right, that was the plan. I'm going to try and learn how to using little glass test tubes (for testing xD). And the electrodes don't look to hard to make, after all, I saw a youtube video on it, so I'm pretty much a proffesional xD. do you know if the electrode materials used are important?

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lemonie
lemonie

Reply 11 years ago

For long term use I think the electrode materials may be important, but you'll probably know at least as much as I do on this. L

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bumpus
bumpus

Reply 11 years ago

What does a torr specify?

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gmoon
gmoon

Reply 11 years ago

Yikes. Yeah, it's not 1983 (date the book was published) anymore...

If you do it, do so outdoors. And be very, very careful.

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guyfrom7up
guyfrom7up

11 years ago

Well, my plan is to make giant nixie bargraph displays, and I thought about emptying out flourescent lights, but I think it adds a bit more of unnecessary danger to the project. And yes, it must be glass because of outgassing.

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Sandisk1duo
Sandisk1duo

Reply 11 years ago

there's no danger if you take the right precautions

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animal_model
animal_model

11 years ago

Hmm. Our local stained glass supplier has borosilicate tubes, but they're not 6 feet. Try a scientific glassware supplier, or a labware department of a local university. Like guyfrom7up asked, what is your application? Can you scavenge from fluorescent tubes? Does it have to be glass, or could you use clear polyester tubes from a plastic supplier? That would be much safer imho, if it suits your app.

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animal_model
animal_model

Reply 11 years ago

Needless to say, exploding glass can not only be a hazard to you, but also to anyone admiring your invention, not to mention opening fluorescent tubes exposes mercury to you and the enviornment, and should never be attempted by anyone...

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killerjackalope
killerjackalope

11 years ago

You know, that's a question I'd like an answer for aswell, there's a few things I'd like to build...

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guyfrom7up
guyfrom7up

Reply 11 years ago

what are you going to build?