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Old 13th September 2012, 12:28 PM   #1
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Default 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?
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Old 13th September 2012, 04:48 PM   #2
macboy is offline macboy  Canada
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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.
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Old 14th September 2012, 09:56 AM   #3
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Thanks, macboy.
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Old 14th September 2012, 10:38 AM   #4
Johno is offline Johno  Australia
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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.
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Old 16th September 2012, 03:56 AM   #5
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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.
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Old 17th September 2012, 06:38 AM   #6
Calvin is offline Calvin  Germany
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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.
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