Jerry,
You are correct there is a reference in IPC-2222 section 10.3
to "When UL requirements are imposed, the area shall be within the limits
approved by UL for the printed board manufacturer."
Now the nickel question is which UL spec?
Maybe some of the folk on the IPC email forum would care to answer.
thanks
dave
Jerry Schwartz <[log in to unmask]> on 05/10/2002 09:53:03 AM
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To: "[log in to unmask]" <[log in to unmask]>
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Subject: RE: [PCB_FORUM] cross hatch patterns
Dave,
See IPC-2222 section 10.3 "Large Conductive Areas" page 21. It
references UL.
Regards,
Jerry Schwartz, CID
IPC Certified Interconnect Designer
Jerry Schwartz, CID Designer 3
Harris Corporation GCSD Voice (321)-727-5474
P.O. Box 37, MS 1/9843 Fax (321)-729-5990
Melbourne, FL 32902-0037 Pager (321)-690-9797
mailto:[log in to unmask]
http://www.harris.com
-----Original Message-----
From: dave seymour [mailto:[log in to unmask]]
Sent: Friday, May 10, 2002 9:20 AM
To: [log in to unmask]
Subject: RE: [PCB_FORUM] cross hatch patterns
John,
Now I'm curious.
What UL Spec says you can't have solid copper plane?
dave
John LaFevers <[log in to unmask]> on 05/10/2002 09:05:08 AM
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To: "[log in to unmask]" <[log in to unmask]>
cc:
Subject: RE: [PCB_FORUM] cross hatch patterns
In some cases...UL....they have a requirement not to permit continuous
copper larger than a penny..therefore hatch meets this standard...
John LaFevers
Jabil Circuits
727-803-5379
-----Original Message-----
From: Dianne Boehm [mailto:[log in to unmask]]
Sent: Friday, May 10, 2002 8:56 AM
To: [log in to unmask]
Subject: RE: [PCB_FORUM] cross hatch patterns
In my previous life as a designer for Military sub contractors, cross
hatch planes were
a requirement, for the following reasons:
Large areas of coppers can blister
Better bonding adhesion between layers
Dianne L. Boehm
Lead Support Application Engineer
Customer Support
PCB Systems Division
Cadence Design Systems, Inc.
16279 Laguna Canyon Road
Irvine, California 92618
Direct Tel (800) 995-9754 Pacific Standard Time
-----Original Message-----
From: punty [mailto:[log in to unmask]]
Sent: Thursday, May 09, 2002 9:07 PM
To: [log in to unmask]
Subject: [PCB_FORUM] cross hatch patterns
hi friends,
i would like to know the purpose of cross hatch patterns used in the
PCB's? what are its advantages and disadvantages?
thanx in advance
punty
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