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May 2009

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Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kevin Glidden <[log in to unmask]>
Date:
Tue, 5 May 2009 14:41:41 -0400
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text/plain
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text/plain (132 lines)
Engelmaier.com  -> white papers
 



-----Original Message-----
From: Karen Tellefsen [mailto:[log in to unmask]] 
Sent: Tuesday, May 05, 2009 2:32 PM
To: [log in to unmask]
Subject: Re: [TN] What does HIGH GRADE FR-4 mean?

Do you have a reference for Werner's paper?

Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069



                                                                           
             "Stadem, Richard                                              
             D."                                                           
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             Sent by: TechNet                                           cc 
             <[log in to unmask]>                                             
                                                                   Subject 
                                       Re: [TN] What does HIGH GRADE FR-4  
             05/05/2009 01:39          mean?                               
             PM                                                            
                                                                           
                                                                           
             Please respond to                                             
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             <[log in to unmask]>                                             
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             "Stadem, Richard                                              
                    D."                                                    
             <Richard.Stadem@G                                             
                D-AIS.COM>                                                 
                                                                           
                                                                           




Hello, Harris,
You are correct that the customer (or circuit interface design engineer)
should provide the specific slash sheet describing the desired laminate
properties from IPC 4101B, as well as a description of the surface finish as
specified in IPC 4552, 4553, etc. Werner Engelmaier has an excellent White
Paper that includes everything that should be on a given PWB drawing.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Harris Dy
Sent: Tuesday, May 05, 2009 12:23 PM
To: [log in to unmask]
Subject: [TN] What does HIGH GRADE FR-4 mean?

Hi All,

Can anyone define High Grade FR-4?

I think it's a vague requirement that I see on customer drawing. Is this
something that should be obsolete now because today customer should really
provide the properties of the laminate that they want to use...
eg Tg, Td, Dk.

Can anyone shed some light?

Thanks,
Harris




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