Electronics Forum | Tue Oct 03 17:08:31 EDT 2023 | assuredtech
What Is FR4 Substrate Material? FR4, also written as FR-4, is both a name and a standard rating. The name is applied to the fiberglass-reinforced epoxy-laminated sheets used in printed circuit board manufacturing. However, the name also functions as
Electronics Forum | Tue Aug 22 13:04:04 EDT 2000 | Eugene Smelik
Dr. Lee, Given the higher reflow temperatures for Pb-Free assembly, will common FR4 laminate materials be adequate, or do you believe that higher glass content boards will be required for mainstream Pb-free assembly? As a corollary question - if man
Electronics Forum | Mon Apr 25 22:56:44 EDT 2005 | davef
rush316 First, no one stated that PBB and/or PCBE are in FR4. FR4 contain tetra-bromo-bisphenol A [TBBA]. Second, there are classes [and grades] of dielectric materials used in fabricating printed circuit boards. Grades, NEMA LI-1. From these gr
Electronics Forum | Wed May 07 21:20:53 EDT 2008 | davef
Causes of Delamination ["Quality Assessment of Printed Circuit Boards" Lund, Preben; Bishop Graphics 1985 0137450354] The reason for delamination is epoxy starvation in the glass cloth layers or an incomplete curing of the base material. It has been
Electronics Forum | Fri Jan 21 14:51:08 EST 2000 | Dave F
Mike: I�d hate to see you making design decisions, based solely on the discussion here, but that this would be an impetus to consult IPC-D-279, "Design Guidelines ... " and take a course on designing reliable boards. Werner Engelmaier (Engelmaier
Electronics Forum | Wed Jul 18 08:00:48 EDT 2001 | davef
250C flass transition temperature - M = coloring agent or opacifier added to F resin with 110-150C glass transition temperature - N = natural color of resin - P = coloring agent or opacifier added to resin - T = natural color F resin blended with
Electronics Forum | Thu May 09 17:21:39 EDT 2002 | davef
In describing a bare board, you need to talk about base, laminate, and conductive materials. Common laminate materials are: * Glass fabric * Cotton fabric * Paper Common NEMA grades of technical laminates are: * Glass Fabric Grades: G3, G7, G10,
Electronics Forum | Thu Jun 25 15:33:51 EDT 1998 | Earl Moon
| | Hi there, | | Does any one know what is TCE for fully wet saturated FR4. I came to know that for Dry FR4 the TCE is about 15-19 PPM �C. Is that true? | | | | Appreciated for your help. | | rgs, | | chiakl | Chiakl, | It looks like you are speaki
Electronics Forum | Thu Apr 27 21:00:32 EDT 2000 | Dave F
Scott: I�m not familiar with some of the things you�re talking about, but let me: * Agree with Russ & Peter regarding immersion silver. * Give some snips of information on the substrate side of things that might help you to tie this together. � FR-1
Electronics Forum | Mon Oct 16 11:12:42 EDT 2000 | NLykus
CEM 1 is a laminate base board material. The other boards in the experiment were manufactured using FR4 as the base board material. What I'm leaning towards is that the glass transition temperature "Tg". What do you think? Topside temperatures in
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