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If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.

TOPIC: Teflon wire sintering

Teflon wire sintering 1 year 11 months ago #2458

During the sintering operation of electrical cable having Teflon taped, silver plated copper wires, the silver plating gets a yellowish (sometimes even a rainbow) color layer, which can be rubbed off by hand. How do we avoid this yellowing of the silver plating? Can anybody guide me please?

Singhal
Last Edit: 1 year 10 months ago by Peter J Stewart-Hay.
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Re: Teflon wire sintering 1 year 11 months ago #2459

Could be a problem of "Red Plaque" which has been a problem for over 40 years and is related to silver plate thickness and consistency and water ingress causing corrosion at point where copper is exposed. Many papers over the years but main cure from what I have seen is very tight quality control on silver plating process.


Erik Macs
Fine International Corp.
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Regards,

Erik A. Macs - Fine International Corporation
tel: 774-244-4105 email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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Re: Teflon wire sintering 1 year 11 months ago #2461

Further to Mr. Erik Macs comment about "Red Plague", I thought the following pdf document might be of some interest.

nepp.nasa.gov/docuploads/97164203-A4FB-4...A%20Red%20Plague.pdf
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Last Edit: 1 year 10 months ago by Peter J Stewart-Hay.
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Re: Teflon wire sintering 1 year 11 months ago #2464

  • Richard Burke
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It is a type or form of oxidation. The heat in the sintering process is either too high or the speed too slow. For those that are wondering the Teflon tape or film is wrapped around the conductor in a fashion that there is a certain amount of overlapping. When the wire is run through an oven or heating system the layers of Teflon will bond with each other and this is called sintering.
Last Edit: 1 year 10 months ago by Peter J Stewart-Hay.
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