Magnet wire insulation that burns off in solder pot

Circlotron · 13th September 2012, 12:28 PM

Some time ago I got 200 small toroids wound by this place and the 1mm diameter wire they used had to have the insulation scraped off before you could solder it. I was expecting that they would use the type of wire that has that insulation that both burns off as you dip it in a solder pot and also acts as a flux so the solder coats the now exposed copper nicely.

Does anyone know what this kind of insulation is called so that I can ask for it next time I get this job done?

macboy · 13th September 2012, 04:48 PM

Generally, it is "self-fluxing enameled wire", sometimes "solderable enameled wire" or "self-solderable enameled wire" . The insulation is often polyurethane. Polyamide/Nylon/Polyester insulation may also be used.

Circlotron · 14th September 2012, 09:56 AM

Thanks, macboy.

Johno · 14th September 2012, 10:38 AM

OBA (formerly OH Obrien) in Melbourne make the stuff.

The most common insulation is the PEI grade 2 (ie two layers) with its higher temperature rating of 200C. (PEI = polyester imide and is quite dark in colour) The other insulations are mostly made to order I understand.

I gather the solderable stuff is PUR which has a low temperature rating of 130C and is not used much anymore. (PUR is a polyurethane mix which is almost clear). It melts off with the soldering iron contact. Be careful with the fumes, apparently they're nasty.

I have just bought a 30kg reel after lots of research and PEI/2 was all I could get off the shelf.

mlindsey · 16th September 2012, 03:56 AM

We buy spools of Nylese wire that the insulation burns off at 700 degrees F. A solder pot works nicely to tin these wires. You do have to use liquid flux with the wire we use.

Calvin · 17th September 2012, 06:38 AM

Hi,

nearly all manufactureres state the properties of their wires in datasheets and papers on their websites. The info Your searching is really not hard to find.
wo further words:

jauu
Calvin

13th September 2012, 12:28 PM	#1
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Magnet wire insulation that burns off in solder pot Some time ago I got 200 small toroids wound by this place and the 1mm diameter wire they used had to have the insulation scraped off before you could solder it. I was expecting that they would use the type of wire that has that insulation that both burns off as you dip it in a solder pot and also acts as a flux so the solder coats the now exposed copper nicely. Does anyone know what this kind of insulation is called so that I can ask for it next time I get this job done? __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

14th September 2012, 09:56 AM	#3
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Thanks, macboy. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

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13th September 2012, 04:48 PM	#2
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	Generally, it is "self-fluxing enameled wire", sometimes "solderable enameled wire" or "self-solderable enameled wire" . The insulation is often polyurethane. Polyamide/Nylon/Polyester insulation may also be used.

14th September 2012, 10:38 AM	#4
Johno diyAudio Member Join Date: Oct 2010 Location: Up in the alps - motorcycle heaven	OBA (formerly OH Obrien) in Melbourne make the stuff. The most common insulation is the PEI grade 2 (ie two layers) with its higher temperature rating of 200C. (PEI = polyester imide and is quite dark in colour) The other insulations are mostly made to order I understand. I gather the solderable stuff is PUR which has a low temperature rating of 130C and is not used much anymore. (PUR is a polyurethane mix which is almost clear). It melts off with the soldering iron contact. Be careful with the fumes, apparently they're nasty. I have just bought a 30kg reel after lots of research and PEI/2 was all I could get off the shelf.

16th September 2012, 03:56 AM	#5
mlindsey diyAudio Member Join Date: Aug 2012 Location: Laurel, MS	We buy spools of Nylese wire that the insulation burns off at 700 degrees F. A solder pot works nicely to tin these wires. You do have to use liquid flux with the wire we use.