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March 2006

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Subject:
From:
Jeffrey Bush <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jeffrey Bush <[log in to unmask]>
Date:
Fri, 24 Mar 2006 10:59:08 -0500
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The single ply / 2 ply minimum requirement has flip flopped over the years, particularly in the US Military specifications.  Since early 1990's the single ply acceptance has been the rule and the latest IPC documents have moved away from determining your design constraints and leaving this condition up to the design activity.  The economics of single ply constructions both in base material and fabrication are there, certainly on the higher layer count designs where the cost savings opportunities are good.     

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of "Sefika ÖZKAL"
Sent: Friday, March 24, 2006 9:13 AM
To: [log in to unmask]
Subject: [TN] prepregs

Hi Technetters,

In some stackup examples, I have seen that one prepreg may also be used as
an inner layer. Normally two or three prepregs are preferred. What are the
rules or limits while choosing the prepreg number according to
manufacturing? I would like to look at IPC specifications and military
standards for my questions. Could you please recommend me the appropriate
specifications?

Thanks in advance.

Regards

Sefika OZKAL



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Search the archives of previous posts at: http://listserv.ipc.org/archives
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