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Old 11th Feb 2019, 3:13 pm   #7
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: PTFE tape for transformer insulation

I first came across Kapton in the mid-1970's when metallised Kapton film started being used as a screen for individual twisted pairs in multi-pair cables. In the course of a conversation with a technical specialist it was mentioned that (at the time ) no-one had been able to find a way of bonding Kapton to itself or anything else using adhesives or solvents. NASA had tried in vain, and the problem was eventually solved by a Frenchman (AFAIR one Jean Vessy Lac) who found that by overlapping two sheets and running a high speed rubber friction wheel along them using the right speed and pressure, the sheets would hermetically bond together.
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