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Old 1st February 2004, 06:49 AM   #1
Prune is offline Prune  Canada
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Default Cotton

I want to use cotton as insulator for my DIY interconnects. I have two questions: where can I get unbleached cotton, and what's the best material to seal the cables airtight, so the cotton doesn't absorb moisture?
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Old 1st February 2004, 08:45 AM   #2
Magura is offline Magura  Denmark
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Default Hmmm....thought of this??



Unless you do some calculations of the pressure increas vs. temperature increase vs. pressure test of cabinet to at least 3 times that, id strongly advice against an airtight cabinet. Its simply a bomb in your livingroom.

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Old 1st February 2004, 09:39 AM   #3
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Exploding interconnects
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Old 1st February 2004, 09:53 AM   #4
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Say what? What cabinet? I'm talking about sealed interconnects.
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Old 1st February 2004, 09:54 AM   #5
Magura is offline Magura  Denmark
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Nope...an air tight cabinet....as would be the only way to keep moisture out of the cotton. I find it hard to believe you would be able to seal each wire on its own. The only other option i can think of is polyolefin heat shrink with an inner liner of glue, but its not enough to keep the cotton dry. The only possible way to seal such to a reasonable extent would be to use ptfe heatshrink (terribly expensive) and then dip the whole thing in a silicone compound to seal it off.

Under any circumstances im still to meet the person with adequately golden ears to be able to tell the difference between the isolation type of the wires in a blind test !

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Old 1st February 2004, 09:59 AM   #6
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I need the cotton to space out the shield far enough from the signal wires (I have lots of EM interference at home), as I can't find large enough Teflon tubing.

BTW I'm all for blind tests, but I'm just maxing this out for fun, to satisfy my fancy eqipment fetish.
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Old 1st February 2004, 10:02 AM   #7
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Heat shrink is not moisture proof?
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Old 1st February 2004, 10:06 AM   #8
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perhaps you could soak the cotton in some kind of oil.
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Old 1st February 2004, 10:15 AM   #9
Magura is offline Magura  Denmark
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Heat shrink is not moisture proof. Its VERY hard to make anything moistureproof....even by dipping (look at the polycarbonate caps...they suffer from such probs).

I have bought ptfe tube from RS components for a not all that outreageous price, it comes in many sizes. I think id choose that over cotton fiddle faddle, or even worse an air tight cabinet.

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Old 1st February 2004, 10:18 AM   #10
Magura is offline Magura  Denmark
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Actually you will find that there are very few types of plastics that are reasonably moisture proof. Polyefin isnt one of them. PTFE is closer to be, one of the reasons its a goos isolator. PVC is also not bad, but have a bad tendensy to destroy everything around it at elevated temperatures.

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