Hi bwana guru Steve,
I feel awe to respond to such an energetic and wise person, it's like being a ninja pupil talking with his master, but let's try (I like your humour). I know what reports you talk about from NASA, Rome, Lockheed, Sandia etc. I gave those reports to people around, but they did not panic. As I see it, Kapton is just ONE of many polyimides, so you can use other materials, being like Kapton, but not from duPont. Now, we have been using Kapton for two decades or more without any problems. We use Kapton for military transformers in radar applications. These components will live a hard life, from any temperatures down to -40C to well over +150C. We have many such tough applications with Kapton and nothing bad reported, not from submarines, not from ground, nor from the aircrafts. There is only one basic restriction: not for use where you have a small bending radius AND movements AND mechanical pressure. What these restrictions are, I can't say withou digging in tons of paper.
qesm / Ingemar
Hi ya'll,
Not to start another thread about something that will upset people, but
lately in the media there has been some talk about Kapton (tm) materials
being somewhat unstable at elevated temperatures...there's stories about this
with the recent crash of Egypt Air flight 990...
I, as undoubley as possibly many of you, have always understood that Kapton
(tm) tapes are what you should use when high temperatures are encountered.
I've used it on numerous assemblies to in the past to prevent such things as
a metal connector body connecting to a via that was mistakenly laid-out
without mask beneath the footprint. As a big as a pain in the butt as it was,
we would cut a teeny piece of kapton (tm) tape to cover a via so that there
was no chance of a via to short to the connector. This is just one
example...there have been many other instances in the past (crystals,
oscillators, etc..) or with other components where I've used Kapton (tm) tape
to do similar things...the tape needed to stay with the assembly as a finshed
product.
Should I, or designers who specify the use of Kapton (tm) in this manner be
concerned about this? Or is this just media hysteria?
-Steve Gregory-
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