Tube furnace tube-hose adapter

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goldandsilver123

Well-known member
Joined
Aug 11, 2015
Messages
203
Hello,

I just bought a tube furnace and I'm after corrosion (Cl2) resistant adapter between the hose(teflon) and the quartz tube.

I saw some custom made teflon adapter but the price is very high, there is some other alternative?

Thanks
 
Sorry for the delay, I was waiting for the tube to arrive, it took more time to arrive them the other company to build the furnace..

Here are the pictures:

OD
20161220_122157.jpg
ID
20161220_122207.jpg
Furnace + tube
20161220_122257.jpg
Furnace
20161220_122305.jpg
At 1000 C
20161215_170158.jpg

I can post more, if these one doesn't show what is needed to see.

The teflon tubing is 8 mm inside and 10 mm outside diameter
 
Can you have a glass blower put a flange on the end of the pipe? Then you can easily use stainless and teflon sheet gasket...sealing either the inside or outside without is difficult due to cl gas.


Sent from my iPhone using Tapatalk
 
Either what snowman said, or put a ground glass joint that is pyrex. Quartz doesn't conduct very well so you may be able to use pyrex at the ends if it sticks out far enough and the run times are days long.


Lou
 
My first idea was using a borosilcate ground joint, but I give up the idea when the company told me the prices to make any type of deformation or "solder" (fused silica-borosilicate). One joint costs about 3x the price of the 48 mm 600 mm quartz tube.

It was then when he told me about the teflon adapter, one costs about the same of 1 joint but if the tube breaks I don't have to pay again..

I think I will buy a PTFE bar and try to machine something out of it.

About the thermal conductivity, I touched one end of the quartz tube, out of curiosity, and it resembles more plastic than glass! :)
 
Perhaps instead of a graded quartz to borosilicate butt weld on the tube, just have them grind the tube so that it is male-ended. Male ends help with dumping out the the contents.

Pyrex female ends ok.

Good job on the Pt bar!
 
Lou said:
Perhaps instead of a graded quartz to borosilicate butt weld on the tube, just have them grind the tube so that it is male-ended. Male ends help with dumping out the the contents.

Pyrex female ends ok.

Good job on the Pt bar!


I will ask about the male ground joint, should be reasonable I think!

Thanks Lou, I really appreciate it!
 
Grinding a joint on existing tubing will cost more.

Lots of glass blowers are set up to do basic quartz work. Very few are set up to grind joints.

Having your ends flanged is going to be the cheapest option, long term. You'll make one set of stainless ends, the teflon gasket will be replaceable, and the quartz tube is also replaceable.

A ground quartz joint will cost you about $50 bucks, probably another $100 to have it joined. Using a graded end just seems like an expensive way of doing it. Graded seals are more common when you only have one small part of an otherwise complex system that needs to be fused quartz.
 
snoman701 said:
Grinding a joint on existing tubing will cost more.

Lots of glass blowers are set up to do basic quartz work. Very few are set up to grind joints.

Having your ends flanged is going to be the cheapest option, long term. You'll make one set of stainless ends, the teflon gasket will be replaceable, and the quartz tube is also replaceable.

A ground quartz joint will cost you about $50 bucks, probably another $100 to have it joined. Using a graded end just seems like an expensive way of doing it. Graded seals are more common when you only have one small part of an otherwise complex system that needs to be fused quartz.

It's not always about the cheapest option, sometimes it's about the best long term option. Don't buy twice what you can buy once.
 
What I was describing was not a wetted stainless part, it was using the stainless only as a system to join teflon sheet and glass. Similar to a triclover sanitary fitting.

I completely agree in re: spending....and chlorine is not something I'd want to be skimpy about the sealing mechanism. Simply using a teflon "plug" seems a little scary to me. Putting pressure on a piece of glass tubing from the inside is always a bad idea, and from the outside is expensive due to the cost of the chunk of teflon needed....let alone the machining afterward.
 
snoman701 said:
What I was describing was not a wetted stainless part, it was using the stainless only as a system to join teflon sheet and glass. Similar to a triclover sanitary fitting.

I completely agree in re: spending....and chlorine is not something I'd want to be skimpy about the sealing mechanism. Simply using a teflon "plug" seems a little scary to me. Putting pressure on a piece of glass tubing from the inside is always a bad idea, and from the outside is expensive due to the cost of the chunk of teflon needed....let alone the machining afterward.

There isn't going to be high pressure inside the tube, just enough pressure to push 5 cm of water column. I need to wait until the holidays are over to quote the male ground joint, this I think it's the best idea, then the teflon plug.
 
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