Source of small quantities of teflon insulated thermal wires for cavity heating?
Dear time nuts.
In need of teflon insulated kanthal or NiCr wire for cavity heating.
Are there any known sources that can supply quantities in the order of 10-50 meters?
Regards
Ulf KylenfallOnsala, Sweden.
Regards,
Martin Bertges, Germany
On 2/6/24 16:01, Ulf Kylenfall via time-nuts wrote:
Dear time nuts.
In need of teflon insulated kanthal or NiCr wire for cavity heating.
Are there any known sources that can supply quantities in the order of 10-50 meters?
Regards
Ulf KylenfallOnsala, Sweden.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
I don't know that I've ever seen PTFE insulated resistance wire. 10-50 meters is pretty long, so you probably can't do it by sliding a PTFE sleeve over the wire.
I have seen references to wire that is 377 ohms/square in antenna testing, but I'm pretty sure that was "fabricated by the experimentalist" using something like "space cloth" (paper with a 377 ohm/square resistance).
You could call or write a company like MWS (https://mwswire.com/). They do custom wire all the time in all sorts of weird configurations. They definitely have resistance wire (about 20 different kinds), and I know they do custom coatings (the data sheet says bare or insulated), but I don't know about PTFE. They sell PTFE/Polyimide tubing from Elektrisola Medical Technologies.
They definitely do small production runs (although it might be expensive).
PTFE insulated wire in general is easy, so if you can find a company that does the "coating" they should be able to do a run with whatever wire you want.
An interesting problem. FWIW, a more common way to make heaters like this is to combine flat conductors with a substrate. Either evaporate it on with a mask, or coat a whole layer, then etch it. Adhering to PTFE is kind of a problem, but they could probably roll a flat sheet, lay the foil over the top, etch the right pattern, then lay another sheet, and thermally bond it as a unit. I'd think that something like polyimide (Kapton) would be more common.
On Tue, 6 Feb 2024 15:01:43 +0000 (UTC), Ulf Kylenfall via time-nuts time-nuts@lists.febo.com wrote:
Dear time nuts.
In need of teflon insulated kanthal or NiCr wire for cavity heating.
Are there any known sources that can supply quantities in the order of 10-50 meters?
Regards
Ulf KylenfallOnsala, Sweden.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
PTFE / Teflon will creep over time when used as a wire insulator.
I've purchased Kapton-coated wire from
https://www.accuglassproducts.com/wire-and-cable/kapton-insulated many
times -- good stuff.
--Andrew
Andrew E. Kalman, Ph.D.
On Tue, Feb 6, 2024 at 12:36 PM Jim Lux via time-nuts <
time-nuts@lists.febo.com> wrote:
I don't know that I've ever seen PTFE insulated resistance wire. 10-50
meters is pretty long, so you probably can't do it by sliding a PTFE sleeve
over the wire.
I have seen references to wire that is 377 ohms/square in antenna testing,
but I'm pretty sure that was "fabricated by the experimentalist" using
something like "space cloth" (paper with a 377 ohm/square resistance).
You could call or write a company like MWS (https://mwswire.com/). They
do custom wire all the time in all sorts of weird configurations. They
definitely have resistance wire (about 20 different kinds), and I know they
do custom coatings (the data sheet says bare or insulated), but I don't
know about PTFE. They sell PTFE/Polyimide tubing from Elektrisola Medical
Technologies.
They definitely do small production runs (although it might be
expensive).
PTFE insulated wire in general is easy, so if you can find a company that
does the "coating" they should be able to do a run with whatever wire you
want.
An interesting problem. FWIW, a more common way to make heaters like this
is to combine flat conductors with a substrate. Either evaporate it on with
a mask, or coat a whole layer, then etch it. Adhering to PTFE is kind of a
problem, but they could probably roll a flat sheet, lay the foil over the
top, etch the right pattern, then lay another sheet, and thermally bond it
as a unit. I'd think that something like polyimide (Kapton) would be more
common.
On Tue, 6 Feb 2024 15:01:43 +0000 (UTC), Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:
Dear time nuts.
In need of teflon insulated kanthal or NiCr wire for cavity heating.
Are there any known sources that can supply quantities in the order of
10-50 meters?
Regards
Ulf KylenfallOnsala, Sweden.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
On 2/6/2024 2:36 PM, Jim Lux via time-nuts wrote:
I have seen references to wire that is 377 ohms/square in antenna
testing, but I'm pretty sure that was "fabricated by the
experimentalist" using something like "space cloth" (paper with a 377
ohm/square resistance).
It's actually derived mathematically and has been verified by decades of
experience. It's a common class problem in EM fields classes.
--
mailto:lists@ozindfw.net http://www.ozindfw.net
Oz; POB 93167; Southlake, TX 76092 (Near DFW Airport)
If electricity comes from electrons, does morality come from morons?
I've used fiberglass insulated thermocouple wire, the Constantin conductor
has plenty of resistance and the current can be fed back on the other
conductor to minimize inductance.
-Mike-
On Wed, Feb 7, 2024 at 5:40 AM Jim Lux via time-nuts <
time-nuts@lists.febo.com> wrote:
I don't know that I've ever seen PTFE insulated resistance wire. 10-50
meters is pretty long, so you probably can't do it by sliding a PTFE sleeve
over the wire.
I have seen references to wire that is 377 ohms/square in antenna testing,
but I'm pretty sure that was "fabricated by the experimentalist" using
something like "space cloth" (paper with a 377 ohm/square resistance).
You could call or write a company like MWS (https://mwswire.com/). They
do custom wire all the time in all sorts of weird configurations. They
definitely have resistance wire (about 20 different kinds), and I know they
do custom coatings (the data sheet says bare or insulated), but I don't
know about PTFE. They sell PTFE/Polyimide tubing from Elektrisola Medical
Technologies.
They definitely do small production runs (although it might be
expensive).
PTFE insulated wire in general is easy, so if you can find a company that
does the "coating" they should be able to do a run with whatever wire you
want.
An interesting problem. FWIW, a more common way to make heaters like this
is to combine flat conductors with a substrate. Either evaporate it on with
a mask, or coat a whole layer, then etch it. Adhering to PTFE is kind of a
problem, but they could probably roll a flat sheet, lay the foil over the
top, etch the right pattern, then lay another sheet, and thermally bond it
as a unit. I'd think that something like polyimide (Kapton) would be more
common.
On Tue, 6 Feb 2024 15:01:43 +0000 (UTC), Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:
Dear time nuts.
In need of teflon insulated kanthal or NiCr wire for cavity heating.
Are there any known sources that can supply quantities in the order of
10-50 meters?
Regards
Ulf KylenfallOnsala, Sweden.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com