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PCB high-voltage meltdown

Nothing of the sort. Kapton(tm) has no chemical relation to Teflon(tm).
Kapton® Polyimide Film



DuPont™ Kapton® is a leader in the high performance films industry, offering
over 40 years of diverse products, global technical support and customer
service. DuPont has set a high standard in the polyimide film markets with
its durability and performance in extreme temperature environments.
Kapton® has a unique combination of electrical, thermal, chemical and
mechanical properties and retains these properties over a wide range of
industrial environments and applications.


From miniaturized electronic components to Mars rover heaters, from high
speed locomotive motors to airbag seat sensors, DuPont™ Kapton® polyimide
films make innovative design solutions possible.

Whats all this advertising? and of course Kapton is not Teflon, did I
say it was?

Copper clad Kapton FN is the standard Kapton HN film laminated with a
0.1mil layer of teflon on either surface. Its easy to clad one side in
copper foil or another metal plate using a standard PCB press. The
other exposed teflon coated surface can be used as an excellent
adhesive if the bonding temperature is above 280degC.
 
A

Ancient_Hacker

Jan 1, 1970
0
A useful trick to decrease the likelyhood of breakdown and arcing is to
bond a layer of copper clad Kapton to the bottom side of the PCB,

Ah, last I heard, Kapton is no longer recommended as electrical
insulation. Seems a big jet caught on fire due to an electrical short.
Which made no sense as the wiring was just 24 volts and insulated with
the best Kapton.

After a little experimenting, it was discovered that a small spark
could make Kapton conductive, leading to more sparks, and so on.
 
H

Homer J Simpson

Jan 1, 1970
0
Ah, last I heard, Kapton is no longer recommended as electrical
insulation. Seems a big jet caught on fire due to an electrical short.
Which made no sense as the wiring was just 24 volts and insulated with
the best Kapton.

No, it seems cabin lighting is run off higher voltage (it is often
fluorescent) and 120 VAC breaking through into the fuel sensors will explode
your 747 no problem.
















....
 
J

joseph2k

Jan 1, 1970
0
Whats all this advertising? and of course Kapton is not Teflon, did I
say it was?

Copper clad Kapton FN is the standard Kapton HN film laminated with a
0.1mil layer of teflon on either surface. Its easy to clad one side in
copper foil or another metal plate using a standard PCB press. The
other exposed teflon coated surface can be used as an excellent
adhesive if the bonding temperature is above 280degC.

Yes, you did.
 
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