Electronics Forum: 7628 (Page 1 of 2)

Copper Finishes versus Layer Thickness

Electronics Forum | Thu Jan 04 12:51:37 EST 2007 | Board House

Hi Chunks, Starting copper on outer layer with .0007 is 1/2 oz. copper foil. so if starting copper is .0007 and your Board house will plate an additional .0021 mils of copper. which will give you a finished copper weight of .0028 Mils or (2 oz.) Y

Immersion Silver PCB Surface Plating

Electronics Forum | Tue Feb 01 14:21:24 EST 2000 | Dennis VanBuren

We are considering the use of Immersion Silver for a PCB surface finish. We currently use Immersion Gold surface finish, which has served us well. However, recent discussions on the cracking of corner joints on large pin count BGA packages, with the

Delamination on IS410 laminate

Electronics Forum | Tue Jul 31 15:33:30 EDT 2007 | gregs110

I have seen a few threads about delamination issues on IS410 laminate in RoHS applications. I have recently been running into a rash of issues on 4 different part numbers with a single PWB source. All the parts have been built fine in the past with

Crazing or Delam - Thermal or Mechanical?

Electronics Forum | Thu Jun 25 22:25:24 EDT 2009 | boardhouse

In the life of this product that you have been doing this process, has the material alway's been IT180 material? One problem with Lead free material is that it is more fragile that standard FR4 Epoxy laminate. And is known to have chipping or fractu

Water Washing

Electronics Forum | Mon Dec 21 12:20:52 EST 2009 | MLD

Here is my question to the Guru's on this site. Lead free boards to go though Wave / reflow - and then sent through a water wash 2 day's prior to Hand assembling a 50mil ribbon connector. This is a 4 layer board with 2x2116 pre-preg (.036 1/1 5x762

Requesting thermo-elastic Epoxy/E-glass laminate/prepreg materia

Electronics Forum | Wed Oct 29 06:17:45 EDT 2014 | julianf

As stated in the title I would like to know the thermo-elastic material properties, most preferably the E-modulus and CTE in x- and y-direction, for Epoxy/E-glass laminates and/or prepregs for various fibreglass cloth styles. Datasheets only give ro

Re: FR4 vs Polyamide

Electronics Forum | Mon Feb 15 15:33:47 EST 1999 | Earl Moon

Any info on the pros and cons of FR4 or Polyamide ref the use of soldering PGAs would be helpful. ie. temp co-efficient diffs, baking, wave soldering, Convection reflow etc I'm sure you know all the basic differences as Tg, X, Y, and Z expansi

Re: Bow and Twist of PCB's

Electronics Forum | Wed Aug 19 08:00:55 EDT 1998 | Earl Moon

Hi there, I'm actually facing a lot of trouble with PCB's presenting up to 3mm of bow /twist at reception i.e. before assembly. The PCB size is 220 by 230mm. The boards are to be assembeled SMD double sides with 05.mm pitch on both sides. In orde

Re: T sub g

Electronics Forum | Thu Jun 25 14:41:07 EDT 1998 | Earl Moon

Alright gentlemen and ladies of the forum, I again seek knowlage on what is probably a well known fact. I have spent a good part of the morning with various IPC standards and weighty tomes such as the Electronic Packaging and Interconnection Handb

Re: T sub g

Electronics Forum | Fri Jun 26 11:27:12 EDT 1998 | Earl Moon

Alright gentlemen and ladies of the forum, I again seek knowlage on what is probably a well known fact. I have spent a good part of the morning with various IPC standards and weighty tomes such as the Electronic Packaging and Interconnection Han

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