These are generic starting points for both Polyclad and Isola's FR4
(226, 370/402,406).  The actual scaling that is incorporated should be
derived from testing from the process that the material is being
fabricated from.  Surface preparation, lamination cycles and tooling
systems have direct impacts on the scaling factors needed.  The attached
is a good starting point for this testing.  



Jeffrey Bush
Director, Quality Assurance and Technical Support

                          76 Technology Drive - POB 1890
                             Brattleboro, Vermont 05302-1890
                                Tel. 802.257.4571.21 Fax. 802.257.0011
                                    [log in to unmask]
                              http://www.vtcircuits.com	



-----Original Message-----
From: Franklin [mailto:[log in to unmask]] 
Sent: Tuesday, May 25, 2004 2:16 PM
To: [log in to unmask]
Subject: [TN] Laminates - scale factors


Does anyone have the data sheet(s) outlining scale factors for Isola and
Polyclad FR4 laminates? 


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Franklin

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