polycarbonate be suitable and have a 94V-0 rating? Thanks.
Dave Cuthbert
Micron Technology
Title: RE: 94V-0 question
I might add that almost any plastic or fiber will pass 94V-0 in application
if adhered to the metal enclosure. The heat sinking makes it almost
impossible to burn
Hi Dave:
> I need a sheet of plastic that goes between a PCB
> and a metal enclosure. This is to make a creepage
> spec. What plastics are good for this? Will
> polycarbonate be suitable and have a 94V-0 rating?
With respect to IEC 60950...
A plastic material used as an electri
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Title: RE: 94V-0 question
Dave,
Some interesting comments and discussion so far.
Let me comment that I often use insulation in
Bryan -
I know this is nit picking, but Nomex is a brand of aramid
paper (a nonwoven polyester) and is not vulcanized fiber.
I agree that it's an excellent insulating material,
especially for high temperature applications, though pricier
than other materials equally suited to Dave's particular
a
1. You have already received many good material suggestions from by others
but do you really need 94V-0? I believe that most standards will allow 94V-2
for this purpose (assuming it provides the necessary creepage & clearance
distances and passes the dielectric strength test).
2. If the enclosure
I read in !emc-pstc that drcuthb...@micron.com wrote (in ) about '94V-0
question' on Tue, 12 Aug 2003:
>I need a sheet of plastic that goes between a PCB and a metal enclosure.
>This is to make a creepage spec. What plastics are good for this? Will
>polycarbonate be suitable and have a 94V-0 ra
This scenaro comes up often in our designs. We typically use 0.010 or 0.020
inch thick Nomex (vulcanized fiber) instead of plastic. The Nomex is UL
recognized, 94V-0, very low cost and can be bought in sheets or punched to
the exact size.
Thanks,
Bryan.
From: drcuthb...@micron.com
To: emc-p..
Hello Dave,
Nomex paper (sheet stock) will do the trick, I believe.
Best regards, Art Michael, Editor, IPSN
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Dave -
You don't identify the end-product safety standard, but here
goes.
Not all polymeric materials are created equal, often not
even in the same generic family. Any number of key material
parameters might change with the formulation of the resin.
To be certain you have a material that meets
DuPont Nomex, GE Lexan, and GE Valox
>From: drcuthb...@micron.com
>Reply-To: drcuthb...@micron.com
>To:
>Subject: 94V-0 question
>Date: Tue, 12 Aug 2003 11:55:25 -0600
>
>
>I need a sheet of plastic that goes between a PCB and a metal enclosure.
>This is to make a creepage spec. What plastics
Not all polycarbonates are V-0. I tend to use Valox: easy to both machine and
hand-cut, good dielectric (have tested single 0.003in sheet to 5kV), most
thicknesses are V-0 rated, and has decent (non) water absorption properties.
I also like to have the mechanical designers put a sheet between chas
Kapton comes to mind.
- Robert -
On Tue, 12 Aug 2003 11:55:25 -0600
drcuthb...@micron.com wrote:
>
> I need a sheet of plastic that goes between a PCB and a
> metal enclosure. This is to make a creepage spec. What
> plastics are good for this? Will polycarbonate be
> suitable and have
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