Download
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Glass syringe needles?
I bought a few glass syringes a few weeks back. I have a whole box of disposables that I'll use where I can get away with it, but for strong solvents
and acids the glass ones would work well.
One problem: they're not really long enough.
Does anyone know if anyone makes glass "needles" that can attach to glass syringes? The end has a small ground joint on it so I'd expect something can
fit on them.
I tried google but it gave me garbage suggestions.
I guess PTFE hose might work too but in my experience PTFE hose is not very flexible and wont fit on the end very well unless I get the size just
right.
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Clear_horizons_glass
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Hey there, Download.
I believe what you are looking for is an outer Luer joint.
I could order those and make you some glass syringes. I even have a wet saw to give them a nice little drip tip if you want. I'll message you.
Clear Horizons Laboratory Glassblowing Services
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Phone and Fax:
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(855) 522-4527
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Download
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Quote: Originally posted by Clear_horizons_glass  | Hey there, Download.
I believe what you are looking for is an outer Luer joint.
I could order those and make you some glass syringes. I even have a wet saw to give them a nice little drip tip if you want. I'll message you.
|
I can't send you a second message but they're not luer lock syringes. They look like plain plastic syringes only made from ground glass.
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wg48temp9
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How do you lap both halves of the syringe and get them to fit so precisely?
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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unionised
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You can get long teflon needles. They are not cheap, but they have the "proper" luer fitting.
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Dr.Bob
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I'm very confused, I have never seen a glass syringe without a luer fitting, some are just friction fit Luer, rather than a lock type with a metal
lock around it. Standard needles in plastic and stainless should fit on it. I can't help much with the needles, but I have scads of various glass
syringes, all have luer fittings, but some are friction, some are locking ones. But if it is a taper fitting, about 1/8" diameter, it is a Luer
fitting.
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Download
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| Quote: Originally posted by Dr.Bob | | I'm very confused, I have never seen a glass syringe without a luer fitting, some are just friction fit Luer, rather than a lock type with a metal
lock around it. Standard needles in plastic and stainless should fit on it. I can't help much with the needles, but I have scads of various glass
syringes, all have luer fittings, but some are friction, some are locking ones. But if it is a taper fitting, about 1/8" diameter, it is a Luer
fitting. |
I was under the impression luer is the twist type.
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paulll
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Mood: It's fine. Really.
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"Luer-lock," refers specifically to the twist-on type.
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Dr.Bob
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Luer fitting is the tapered part, Luer Lock is the metal twist version. They both have the same tapered part in common.
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macckone
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there are teflon needles on amazon but you have to buy 500 and they are expensive for a pack.
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Clear_horizons_glass
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I messaged ya about making one, Download.
But alternatively, if you have any experience in pulling down capillary tubes with a bunsen, you could just order an inner Luer joint (like the joint
on the syringe), and as many outer joints as you want. Would be pretty simple if you have access to a bunsen or a map gas torch. Wouldn't be to
different than capillary tubes.
Here's a quick little run down of how to pull down your own long borosilicate glass needles for a typical luer joint glass syringe using a bunsen
burner or map gas torch.
Didymium glasses and a proper ventilation hood are strongly recommended if you will be doing this a lot.
1. Take some graphite tape, ceramic tape, or a folded slightly damp paper towel and stick it in between the two joints and twist them together to get
them a little stuck.
2. rotate the inner joint in one hand, and hold onto the end of the outer joint with tweezers in the other hand.
3. Move the outer joint back and forth through a hotter flame while consistently slowly but steadily rotating. Be sure to not twist the tube, and try
to rotate with your hands in synchrony.
4. When the tube is red hot and doesn't 'feel' solid, bring the tube out of the flame and begin pulling while slowly rotating at a consistent, steady
pace.
5. Let the pulled down joint cool down on a surface that won't burn.
6. Use a scoring knife, a sharp piece of tungsten, or the edge of a file, put a small 'score' on the tube where you want the end to be and pull it
off. Wetting the score helps, and be sure to pull and bend at the same time with the score facing away from you. Safety goggles are highly recommended
if you are doing this a lot. It doesn't take much pressure with such small tubing.
Here's a more comprehensive guide on scoring and splitting up glass tubing and rod.
http://www.ilpi.com/glassblowing/tutorial_cutting.html
7. You can give it a drip tip with a dremel and some kind of diamond bit wheel. Be sure to do that under running water, and with safety goggles.
8. If you would like you can touch the freshly scored end of the tube to the side of the flame to 'flame polish' it so it's less sharp. Be careful as
it does not take much, and it's very easy to close up the end of the tube.
9. To dislodge the two joints, use a small piece of wood to lightly tap around the outer joint while very lightly pulling the inner joint, or while
angling the two in such a way that the outer joint will slide off. You can also lightly tap the outer joint against a table while lightly pulling. Try
to pull by and bigger section of the outer joint left as opposed to pulling on the section that was pulled down to a smaller diameter.
Here's a video on pulling down capillary tubes:
https://www.youtube.com/watch?v=2yKHvKCatmM
Here's a link to where you can order Luer joints from Chemglass.
inner: https://chemglass.com/ground-joints-inner-luer
outer: https://chemglass.com/ground-joints-outer-luer
Clear Horizons Laboratory Glassblowing Services
-------------------------------------------------------------
www.clearhorizonsglass.com
Phone and Fax:
(855) LAB-GLAS
(855) 522-4527
Have a glass project you want made? email me at
info@clearhorizonsglass.com
or message us here |
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message |
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ErgoloidMesylate
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| Quote: Originally posted by Download | I bought a few glass syringes a few weeks back. I have a whole box of disposables that I'll use where I can get away with it, but for strong solvents
and acids the glass ones would work well.
One problem: they're not really long enough.
Does anyone know if anyone makes glass "needles" that can attach to glass syringes? The end has a small ground joint on it so I'd expect something can
fit on them.
I tried google but it gave me garbage suggestions.
I guess PTFE hose might work too but in my experience PTFE hose is not very flexible and wont fit on the end very well unless I get the size just
right. |
I was thinking about an improvised method of a stainless steel needle with small diameter teflon tubing clamped and then teflon tape wrapped around
it.
Cannula transfer and cannula filtering is used for lysergic synth Compressed air and remove co2
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