Teflon is not a conductor in any sense and cannot be silver plated, please stop this wrong information.
http://www.druflon.com/ptfeprop.html http://webphysics.davidson.edu/faculty/dmb/PY430/Friction/teflon.html PFTE or teflon wire in layman terms refers to the insulation insulating the wire and not the wire itself, which does infact need to be a conductor not a insulator. If I say copper wire, then everyone plainly knows that the wire is made from copper, but the incorrect term of teflon wire refers to the insulation only, not the wire. http://www.wesbellwireandcable.com/Teflon.html PTFE has is a group of elements used in the manufacturing process of the insulation for wire and cable that reaches high temperatures of 200°C. PTFE Type E <Teflon/high-temperature-wire-ptfe-type-e.html> is the most basic type of *high temperature wire* that comes in awg sizes 26 through 10. Other types of single conductor lead wire in high temperature are Type EE <Teflon/high-temperature-wire-ptfe-type-ee.html> and Type ET <Teflon/high-temperature-wire-ptfe-type-et.html> which are mostly used for different voltage applications. Type EE is 1000 volts and Type ET is 250 volts along with a few more minor differences. PTFE cables are known as STJ high temperature cables <Teflon/stj-teflon-shielded-cable.html> which stands for *Shielded Tape Jacket*. Even though it says "shielded" you can still get these PTFE cables in an unshielded version. STJ cables use the same Type E lead wires for the conductors so that all of the insulation in the cable is rated for 200°C. For various kinds of *high temperature wire*, the National Electric Code specified that the corrections for the ampacity of each cable should be done if the wire will be exposed to high temperatures. This especially holds true when these wires are exposed to temperatures that are higher than the originally prescribed value. The fixed maximum value for the temperature is at 86 degrees Fahrenheit or 30 degrees Celsius. Another factor that should be considered is the amount of current that passes through the cable. If you are planning to use higher voltage, it is likely that there will also be a high degree of current that flows through the cable. When this happens, additional heat builds up not only in the wire itself but also in the other structures that surround the wire. These structures include the wire jacket and the wire insulation. It is important to derate the terminals to improve the ampacity of the wire that you will use. Ampacity is the acceptable value for the amount of current that passes through the wire. Usually, this is measured in Amperes. Another method to improve the ampacity of your wire is through the use of ampacity correction. Ampacity correction is the manipulation of a certain factor in order to adjust the ambient temperature of the high temperature wire <Teflon/high-temperature-wire-ptfe-type-e.html>. In other words, the fixed value for high temperature tolerace is shifted to accommodate the high amount of current that passes through this wire. As a result, the heat produced is significantly decreased. In the field of industrial heating, most of the standard classifications of wires can tolerate continuous exposure to temperatures that can be as high as 200 degrees Celsius. Usually, these cables are covered with an insulating jacket made of Silicon, PVC or PTFE. Aside from that, these wires are also equipped with a metallic jacket to preserve the integrity of the insulation material of the conductor. These wires are also known to tolerate working temperatures that can go as high as 630°C. This occurs when the voltage a maximum of approximately 600 Volts. To withstand these conditions, these wires should be coated with a different type of insulating unit as compared to the conventional wires. Commonly, industrial experts have made use of fiberglass braided jackets and MICA tapes. These are treated with saturants that were proven to withstand high temperatures. To add protection to the integrity of the cables, you may also avail of jackets that are made of stainless steel. These wires have a lot of uses. In the home setting. It can be used for (1) microwave ovens; (2) stoves; (3) commercial cooking equipment; (4) electrical grilling systems; and (5) coffee makers. In the commercial setting, these can be used for (1) sensors; (2) automotive; (3) oil exploration equipment; (4) computer units; (5) power plants; (6) cellular base stations; (7) turbine power generation systems; and (8) microwave RF systems. Recently, the high temperature wire has also been used in the military field and the commercial aerospace industry. Please call with any questions about our PTFE wire or PTFE cables <Teflon/stj-teflon-unshielded-cable.html>. On 25/06/2012 23:46, Fred Townsend wrote: > Teflon is a conductor in the sense that Teflon does not get along with > copper and therefore will always be silver plated and therefore have a > slightly lower resistance than copper alone and since the power poles are > silver plated as well, will not have any galvanic noise or corrosion. Teflon > wire also solders easier than copper. > Teflon insulation has both good and bad characteristics and is not approved > for some NASA applications. > 73, Fred > > -----Original Message----- > From:elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Adrian > Sent: Monday, June 25, 2012 2:41 PM > To:elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 just goes off - SOLVED > > As far as I know Teflon is a good insulator, capable of high temperatures > and pressures. If you say teflon wire, you give it the false interpretation > of being a conductor., like the guy that said solder was a "poor"" > conductor, really? > > I did volt drop tests , I have professional crimp sets and solder systems, > being based in electrical trades for a living. > > A topend fluke MM told me that I achieved 0.15v better VD figures across the > same cold weld (not "weld"), properly crimped connection for cable size and > type. You will not minimise the volt drop to best achievable until soldered. > > Test @ 20 amps. > > A wet cloth wrap near the connection helps prevents solder run (capillary > action) down the conductor/cable. > > A good ref here: > http://www.virginiawind.com/tips/060801_01.asp > > > > On 25/06/2012 20:16, Fred Townsend wrote: >> Rick I use Teflon wire for my battery leads. > ______________________________________________________________ > Elecraft mailing list > Home:http://mailman.qth.net/mailman/listinfo/elecraft > Help:http://mailman.qth.net/mmfaq.htm > Post:mailto:Elecraft@mailman.qth.net > > This list hosted by:http://www.qsl.net > Please help support this email list:http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
