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PTFE gland packing

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PTFE gland packing

Postby kiwi » Sun Nov 28, 2010 4:15 pm

Anyone used this stuff? Basically it's a square profiled tape / string / whatever, made from pure PTFE. I've got 4mmx4mm by whatever length I ask for, $8 a metre. You can get an expanded-PTFE version (much softer, probably get an easier seal with less pressure on it), but unfortunately it has some sort of adhesive on one side that I can't get any information on whatsoever, no msds sheets or anything. The application I'm thinking of will be a moving seal though, so I'm happy with the stronger stuff.

This is the stuff I've got: http://www.needsee.com/si/Seals-112543_product.htm

This is the stuff I'm considering for a better dynamic seal: http://www.needsee.com/si/Seals-113586_product.htm

So, who knows about graphite in the vapour path?
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Re: PTFE gland packing

Postby Rednose » Sun Nov 28, 2010 6:23 pm

Yes, I use it (another brand mark) in this essential oil boiler for the lid which is srewed to the boiler, works a charm.

I use to add a pot still head with liebig condenser while distilling oils.

Dunno about graphite for ethanol.
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Re: PTFE gland packing

Postby Rednose » Sun Nov 28, 2010 6:29 pm

Sorry, that pic was without the screws, it was just built when I took the pic. :oops:

Here it is with a head on it
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Re: PTFE gland packing

Postby myles » Wed Dec 01, 2010 2:46 am

I have a sheet of solid PTFE that is 2mm thick, that I am thinking of using to cut gaskets from. It is fairly hard but a wrap of PTFE thread tape around it should sort that out, and improve the seal.

I am intending it for a semi-permanent bolted together seal for the cap on my thumper. This is a trial to see if it works OK and if it does I shall use the same technique on the lid of my double boiler.
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Re: PTFE gland packing

Postby Azframer » Wed Dec 01, 2010 2:08 pm

I wonder if a bit of your foreshot would eat that adhesive off and solve the problem that way?
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Re: PTFE gland packing

Postby Rednose » Wed Dec 01, 2010 4:24 pm

Azframer wrote:I wonder if a bit of your foreshot would eat that adhesive off and solve the problem that way?

Who talked about adhesive AZ, the wrap for a gasket don't need adhesive.

Almost all my sealings are Teflon (PTFE) but a straight sheet is pretty hard and might not seal well if the surface isn't machine planned.
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Re: PTFE gland packing

Postby Azframer » Wed Dec 01, 2010 4:46 pm

Kiwi's lead to this thread said: but unfortunately it has some sort of adhesive on one side that I can't get any information on whatsoever, no msds sheets or anything.
So that is why I said that.
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Re: PTFE gland packing

Postby Rednose » Wed Dec 01, 2010 5:35 pm

Oh, I see AZ.

The one that I use don't have any glue or whatever, I fit it with compression in it's place and it sticks there (10mm material in 10mm channel).

BTW: this PTFE material tolerates a lot of un-even surface.
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Re: PTFE gland packing

Postby kiwi » Wed Dec 01, 2010 6:55 pm

Yeah mines going into a machined copper channel as well but I have the 4mm version. That's not the actual brand I have in the link, but it looks close enough. It's a little bit compressable.

I tried with foreshots, it made it gummy but didn't completely dissolve.
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Re: PTFE gland packing

Postby Rednose » Wed Dec 01, 2010 9:08 pm

Kiwi, just an idea.

If you do it the same like i did (pressure fix), you could get the adhesive off by using gasoline or just heat, than wash it out with high ABV likker =>heads till all gasoline taste is off. Just heat could get it off, maybe, as those adhesives in majory are double sided tapes.

In the channel surface you could set some small points of silicon (the food grade) to fix it for the first set.

Once it's in his place and under pressure the vapour won't touch the silicon anymore, that's proved as my product goes to an analysis every once and ever.

I like what they do "on the other side of the river", safety is first but it can go into extremes also and any extreme isn't good at all. :)

I remember a topic where it was said that a plastic bottle spout dispenser is a no-no. :screwy:

I have some german made (they pour exactly 1 ounce) since 25 years, they are still like new and I'm still alive :lol:
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Re: PTFE gland packing

Postby Azframer » Wed Dec 01, 2010 9:18 pm

Kiwi can you get this stuff?
http://www.goofoffstainremover.com/
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Re: PTFE gland packing

Postby kiwi » Wed Dec 01, 2010 9:24 pm

Nope. I've got some of the non-adhesive stuff now, so I'll see how it seals. As I said in the OP, I'm happy with the harder stuff for now, I'm not sure how the soft stuff will wear.
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