Larry, is the cold flow performance of the Tefzel better than Teflon?
Carl
KM1H
----- Original Message -----
From: "Larry Benko" <xxw0qe@comcast.net>
To: "Harold Mandel" <hmandel@barantelecom.com>
Cc: <amps@contesting.com>; "Rich Schmuke" <rdj@wildblue.net>
Sent: Monday, July 28, 2008 11:18 AM
Subject: Re: [Amps] Wire
>I had responded to Rich last week but I guess he either didn't like my
> answer or just wanted more opinions.
>
> Look at
> http://www.welchfluorocarbon.com/techdata.htm#Table1FluoropolymerSelectionGuide
>
>
> for more than you probably want to know. I measured some 20 or 22 gauge
> twisted Teflon and Tefzel wire a few years ago and couldn't see any
> difference other than Tefzel has a slightly higher dielectric constant
> (2.6 vs 2.2). Tefzel is not rated to quite as high temperature but both
> are plenty high enough. :)
>
> Also in may last job we used only Tefzel wire in aircraft products. I
> think it is becoming more common that Teflon insulated wire. Also the
> breakdown voltage is higher than Teflon and the material is harder which
> is good for wire that is wound against a surface. Both Teflon and
> Tefzel are DuPont registered trademarks.
>
> 73, Larry W0QE
>
>
> Harold Mandel wrote:
>> Rich
>>
>> [snip]
>> Does any know a reason why TefzelR ETFE insulated wire would not be as
>> good or better because the dielectric strength is even higher...
>> [snip]
>>
>> A balun will generate heat.
>>
>> Manufacturers of popular baluns realized
>> stations would attempt to load RF into
>> huge mismatches and because they wanted
>> to reduce warranty claims, went for the
>> cheapest solution that would withstand
>> heated wires the longest.
>>
>> While PTFE insulated wire is a common
>> choice for commercial balun products there
>> are always upgrades in quality.
>>
>> Why not build such a device and test it
>> using your ETFE stuff? Mismatch it
>> and report on its ability to handle
>> high temperatures.
>>
>> I for one would be very interested in
>> insulation that would surpass PTFE.
>>
>> Hal Mandel
>> W4HBM
>>
>>
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