You mean all the stuff contain in the black ink characters on a white paper? -------------------------- Sent using BlackBerry ----- Original Message ----- From: TechNet <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Sent: Tue May 05 14:59:15 2009 Subject: Re: [TN] What does HIGH GRADE FR-4 mean? Hi again Karen, Here's a couple of links that gives some idea of what's in the white paper: http://www.globalsmt.net/content/view/1184/106/ http://www.trafalgar2.com/documents/Columns-Engelmaier/7.1-engelmaier_2p gs.pdf Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Tellefsen Sent: Tuesday, May 05, 2009 1:32 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." <Richard.Stadem@G To D-AIS.COM> [log in to unmask] 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 TechNet E-Mail Forum <[log in to unmask]> ; Please respond to "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? 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