teflon wire question

[funkmeblue]

is all teflon wire silver plated?

[FYL]

Most is, because PTFE can't easily be extruded atop bare copper.

[funkmeblue]

so, not all.....where can I find some that is not?

[selloutrr]

special order threw canari, beldon, mogami, columbia.

contact a wire manufacture and ask for a part number or dealer.

[funkmeblue]

hey, thanks alot, I look into it

[Ken Moon]

is all teflon wire silver plated?

Another alternative to silver-plated copper is tinned copper.

Silver-plated copper is still banned in some aerospace applications due to possible copper oxide corrosion, so a popular hookup wire for these applications is MIL-W-22759/16, which is tinned copper stranded wire with a tefzel jacket.

Here are a couple of sources:

http://steinair.com/wire.htm

http://aircraftspruce.com/catalog/elpag ... dlwire.php

and here is the spec:

http://nepp.nasa.gov/npsl/wire/22759/22759.htm

[David Root]

Tell us about "possible copper oxide corrosion" in silverplated wire. Does it deteriorate with age ie inrease in resistance?

[Structo]

Thanks for the links Ken.

I take it the mil spec 27500 wire is stranded?

[Ken Moon]

"Red Plague" was the name given to copper oxide corrosion that appears on silver-plated wire, when the silver is touching copper, and the silver and copper are exposed to humid air.

It only occurs if the copper is exposed to the air - proper wire prep and soldering prevents this in most cases.

It was a problem in military hardware that showed up in the sixties as a fine dark red dust around wire connections.

Eventually, large sections of the copper wire can be replace by oxidized copper, which can greatly increase the resistance without causing an open condition. I've seen badly corroded wire from old Navy aircraft that measured 50k ohms or more from one end of the harness to the other.

The problem (mostly) went away when silver plating was banned in about 1970 from most military and aerospace applications.

Here are some references:

http://nepp.nasa.gov/docuploads/9716420 ... Plague.pdf

http://www.astonmet.com/ss/images/win_ca1207-7.html

http://www.google.com/imgres?imgurl=htt ... s%3Disch:1

http://nepp.nasa.gov/DocUploads/49D8C14 ... 0Links.doc

http://nace.confex.com/nace/2009dod/pre ... t_8137.htm

[Ken Moon]

Thanks for the links Ken.

I take it the mil spec 27500 wire is stranded?

Yep.

I don't think there's any mil-spec wire that's solid core - I could be wrong though

I like silver-plated wire myself, and the stuff Steve at ApexJr sells has worked great for me. It's easy to solder.

But if you want to say your amp is mil-spec, go with the real mil-spec wire. It solders OK, especially if you tin it- everybody tins their wires, right?

[ApexJr.]

funkmeblue....

Their is also nickel plated copper wire that has a teflon jacket
needs a little more heat to get the solder to stick.
I have some in stock, Bought thinking it was silver plated

Steve @ Apex Jr.

[FYL]

Eventually, large sections of the copper wire can be replace by oxidized copper, which can greatly increase the resistance without causing an open condition.

Red Plague wasn't as bad as some would like us to believe: "A NEMA investigation reported that out of a total US production of 18 to 20 x109 ft of silver-plated copper wire, only 105 ft (i.e. 0.003%) had a significant amount of red plague and that no malfunctions could be attributed to this phenomenon."

Corrosion of Silver-Plated Copper Conductors, B.D. Dunn, A. de Rooij & D.S. Collins, European Space Agency.

Exposed copper + moisture = possible Red Plague.

I've seen badly corroded wire from old Navy aircraft that measured 50k ohms or more from one end of the harness to the other.

Nearly anything will corrode at sea, Navy gear is no exception...

Exposed copper + moisture + salt = probable Red Plague.

[David Root]

So for our purposes, where the chassis and everything in it dries out when it's operating, red plague is highly unlikely even in a high humidity environment.

[Jackie Treehorn]

so, not all.....where can I find some that is not?

http://angela.com/kimbertcsshookupwireonefoot.aspx

Good stuff!

[funkmeblue]

right on, have you ever used it? Watts carries some stuff too. Does not specify if it has plating. I read somewhere that they can't do it without plating it. I want pure copper. thanks