|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
|
|
Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
|
In Reply to: Re: Anyone using Kapton wire to diy interconnect? posted by Jacques on August 19, 2005 at 02:15:35:
Jacques: "" Most of the time, kapton insulated wires have a double shealth, the inner being kapton, and the outer being a slipperier layer like silicon or PTFE ""
We use tefzel as the outer coat..as it provides better abrasion resistance and works in cryogenic apps.
Jacques: ""service temperature: 155¡C instead of 260¡C""
Manhattan/CDT list FEP, Kapton, and Silicon as 200 o rated. I am confused by your numbers..
Jacques: ""Dielectric strength: 270KV/mm instead of 24KV/mm ( by far the best
polymer known)""
Totally, it amazes me also..I do find that even if I need only a kilovolt isolation, two layers are needed regardless of thickness, due to pinhole defects.
Jacques: ""Kapton insulated wires are used where risk of arcing shall be avoided, like in airborne equipment and spacecraft""
From what I recall, Kapton is now being avoided for flight hardware because of the arc problem. I think it is banned from us military flight hardware. Maybe they use it with an overcoat?
Jacques: ""(BTW, all kapton insulated wires I know are made with tape wrapped around the conductors; There is no extrusion around the conductors, the way it is done with vinyl, PVC, or most of the time teflon and PTFE. Why? Because kapton does not melt (so no way to extrude like with molten PVC), and its polymerisation is very fast with by-products to wash out""
Same here..I have been unable to get non-tape insulated wires. From what I know, imidization occurs at 300 or so degrees C, and that occurs after the xylene evaporates. We on occasion use a liquid form to fix defects in insulation on the beam tubes, with a honker of an IR oven. I was unaware of byproducts of imidization...thanks.
Jacques: ""we specified it for the internal wiring of the spectrometer on Titan probe Permittivity, Wave & Altimetry instrument. Seems it worked.""
Apparently so..congrats..I would have thought the choice of kapton for deep space hardware would have been based more on radiation resistance (Kapton is excellent there) as well as cryogenic withstanding (again, Kapton is great at this) Those two qualities make it very good for high radiation resistant superconducting magnets..
Nice post, very informative..thanks.
Cheers, John
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Anyone using Kapton wire to diy interconnect? - jneutron 08/24/0511:24:18 08/24/05 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]