Got it now:
http://www.portplastics.com/plastics/techSpecs/index.html
and hit UL Test Procedures
Dave Cuthbert
From: drcuthbert
Sent: Thursday, June 19, 2003 2:05 PM
To: 'Peter L. Tarver'; EMC-PSTC (E-mail)
Cc: POWELL, DOUG
Subject: RE: PCB marked for UL 94V-0
94V test procedure:
www.portplastics.com/download/pdf/plastics/ techspecs/techspecs24.pdf
burn, baby, burn
Dave Cuthbert
Micron Technology
From: Peter L. Tarver [mailto:peter.tar...@sanmina-sci.com]
Sent: Thursday, June 19, 2003 12:30 PM
To: EMC-PSTC (E-mail)
Cc: POWELL, DOUG
Subject: RE: PCB marked for UL 94V-0
Doug -
Chances are very good, if the finished board is V-0, the
base laminate would also be capable of V-0, even if not
separately tested. The converse is not necessarily true.
I've seen V-0 laminates not comply with V-2 requirements
after particularly harsh fabrication processes or overstated
MOTs. It's very unlikely that a base laminate that could
not meet V-0 requirements would then meet V-0 as a finished
board.
I don't see any particular value in trying to validate the
base laminates. Not only might the fab house use a wide
array of suppliers and laminate cat. nos. for a given cat.
no. board material, the lists expand and contract regularly
and you'd have a big headache trying to jeep up with it.
If you _must_ validate the base laminate, you'd have to work
something out with the board vendor(s) and specify the
materials they can use.
UL does have a Recognition category for the base laminates:
Polymeric Materials - Filament-wound Tubing, Industrial
Laminates, Vulcanized Fiber, and Materials for Use in
Fabricating Recognized Printed Wiring Boards - Component
(QMTS2). A large number of copper clad industrial laminates
and other laminates that may be clad by the fab house are
included in this category.
Laminate sheets may or may not be marked individually, but
the paper or other wrapping for a bundle should be labeled,
if the sheets are not.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com
> -----Original Message-----
> From: owner-emc-p...@majordomo.ieee.org
> [mailto:owner-emc-p...@majordomo.ieee.org]On
> Behalf Of POWELL, DOUG
> Sent: Thursday, June 19, 2003 9:48 AM
> To: EMC-PSTC (E-mail)
> Subject: PCB marked for UL 94V-0
>
>
> Hello group,
>
> An interesting question came up about validating
> printed circuit board raw material. In searching
> for alternate vendors we provide a spec that V-0
> material is required and a UL V-0 stamp be placed
> on the board.
>
> The question is, how do I independently validate
> the material used, since a vendor could
> theoretically choose whatever they want and stamp
> it as V-0?
>
> -doug
> Douglas E. Powell
> Regulatory Compliance Engineer
> Advanced Energy Industries, Inc.
> Fort Collins, CO 80535 USA
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