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Insulating plastic sheet

C

Chris Jones

Jan 1, 1970
0
Does anyone know where to get that plastic sheet lining that is used
inside the metal case of electronic fluorescent ballasts to wrap around
the PCB where they would otherwise not meet the creepage and clearance
requirements of IEC specs? I think it is also used in some power supplies.

Ideally I would like to find a type that is already recognised by the
safety test labs, and that is fire retardent.

Chris
 
U

Uwe Hercksen

Jan 1, 1970
0
Chris said:
Does anyone know where to get that plastic sheet lining that is used
inside the metal case of electronic fluorescent ballasts to wrap around
the PCB where they would otherwise not meet the creepage and clearance
requirements of IEC specs? I think it is also used in some power supplies.

Hello,

you may look for kapton foils.

Bye
 
P

Phil Allison

Jan 1, 1970
0
"Chris Jones"
Does anyone know where to get that plastic sheet lining that is used
inside the metal case of electronic fluorescent ballasts to wrap around
the PCB where they would otherwise not meet the creepage and clearance
requirements of IEC specs? I think it is also used in some power supplies.

Ideally I would like to find a type that is already recognised by the
safety test labs, and that is fire retardent.


** Why not use that reddish or grey coloured vulcanised fibre sheeting that
you see everywhere ?

Will not easily puncture or tear like plastics do and is not easily
combustible.

Also known a "fishpaper", "leatheroid" or "elephant hide".



.... Phil
 
C

Chris Jones

Jan 1, 1970
0
"Chris Jones"


** Why not use that reddish or grey coloured vulcanised fibre sheeting that
you see everywhere ?

Will not easily puncture or tear like plastics do and is not easily
combustible.

Also known a "fishpaper", "leatheroid" or "elephant hide".



... Phil

Thanks. I will consider that stuff. It was also a useful source of
search terms that turned up these products:
http://www.itwformex.com/Products.html

Chris
 
D

DecadentLinuxUserNumeroUno

Jan 1, 1970
0
Hello,

you may look for kapton foils.

Bye


You want paper. Nomex transformer paper. 1500 volts per mil.

You can get it from one mil thick to over 50 mils.

As far as plastic goes, even the worst choice likely has the dielectric
strength to act as an insulator. But there are plenty of polymers which
are actually used for and sold for this purpose.

Not just one.
 
M

Martin Riddle

Jan 1, 1970
0
Phil Allison said:
"Chris Jones"


** Why not use that reddish or grey coloured vulcanised fibre sheeting
that you see everywhere ?

Will not easily puncture or tear like plastics do and is not easily
combustible.

Also known a "fishpaper", "leatheroid" or "elephant hide".



... Phil

I haven't heard the term Fish paper in a long time.
Nomex is preferred, even 94V-0. I don’t know if fish paper has a
rating.

Cheers
 
G

Greegor

Jan 1, 1970
0
http://www.professionalplastics.com/FISHPAPER

http://www.newark.com/gc-electronics/560/fibroid-fish-paper-electrical-insulation/dp/94F4073

GC ELECTRONICS - 560 - FIBROID FISH PAPER ELECTRICAL INSULATION
10"x24" $9.63

Q: Is this material UL Recognized; if so, what is the file number?
A: This part is UL listed and the UL file number is E55656.

http://www.gasketing.net/fish_paper.htm

Fish Paper Gasketing

We have no idea where Fish Paper originally got it's unique name. It
is not because it is used to wrap fish, put possibly because it looks
like the paper used to wrap fish.

Intended for electrical applications involving high dielectric
strength, plus good forming and bending qualities. Applications
include all types of armature slot insulations, arc shields, coil
insulations, insulation washers, and formed specialties.

Size: .010” x25” x40”


http://www.itwformex.com/Fish-Paper-Aramid-Paper-Alternative.html

Fish Paper & Aramid Paper Alternative
Fish paper and aramid paper are not always the best choices for
electrical insulation. Alternative materials have characteristics that
can reduce cost and improve design performance. Unlike fish paper,
which is made of cellulose, and aramid paper, which is made of aramid
fiber, Formex™ polypropylene electrical insulation is non-hygroscopic
(moisture absorption <0.06%). This means Formex retains its structural
integrity and dimensional stability even in the most demanding outdoor
applications unlike typical insulation paper.

Formex also has greater dielectric strength than fish paper and aramid
paper enabling thinner sheets of insulation material to be used in an
application thereby saving cost and weight.

Most importantly, Formex, is easily scored and folded into durable
three-dimensional parts providing the ability to replace molded and
sheet metal parts such as air-flow baffles, battery covers, and wire
harness organizers with a lightweight, low-cost, flame-retardant
material.
 
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