Electronics Forum: pre-preg (Page 1 of 2)

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

board delaminated after reflow

Electronics Forum | Wed Apr 08 14:46:34 EDT 2009 | boardhouse

The things to ask your board supplier would be: 1) Was the Pre-preg material that was used on this board within its Shelf life? and ask for the Incoming inspection CofC for the Pre-preg material. 2)Was this order shipped from Stock - this is why


Electronics Forum | Mon Jul 20 11:44:21 EDT 2015 | migliore

Hi, does anybody know the steps for manufacturing a 6-layer PCB? Let's say we have 1 core and 2 pre-pregs. Thank you, Enrico Migliore

PCB Delamination

Electronics Forum | Thu Jan 31 18:14:40 EST 2008 | boardhouse

Hi Felix, First thing to verify is that your supplier is actually suppling you with the correct material. China is known for not keeping with the requested materials and will substitute if not controlled. I would recomend ITEQ, TUC or Nan ya for of

Delamination / Measling

Electronics Forum | Mon Dec 08 17:06:59 EST 2008 | boardhouse

Hi MGL, Couple things to ask, have the boards recently been changed to Rohs builds? STD FR4 to High TD Laminate. Check the stack-up the board houses are using. Just about all Rohs laminate has Resin starvation issues when used in single ply co

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

0.031 pcb bowing -- solutions?

Electronics Forum | Tue Aug 28 08:28:30 EDT 2012 | rgduval

We agree with all of the previous comments, and would add the following: Warpage is generally caused by excess moisture in the raw boards. Have you tried baking the boards prior to assembly? We had this issue on a simple 4-layer board, and found t

Lead-free PCB: After Effect

Electronics Forum | Tue Aug 22 13:05:32 EDT 2006 | Board House

Hi CP, From a PCB manufacturing side, all of our product is Lead free / RoHs compliant if it has a surface finish other than Hot Air. To be ROHS compliant and Able to with stand Lead Free Assembly, this is where the board house would need to switch

Re: white residue

Electronics Forum | Fri Jan 29 05:14:06 EST 1999 | Graham Naisbitt

Hi guys, I really am at a loss to understand this one. It would appear that there may be some reaction between the flux and the resist? Or maybe you have an OSP on the board that is reacting during soldering? As a fast fix, maybe you should try a

Re: white residue

Electronics Forum | Wed Feb 10 12:52:21 EST 1999 | Dick Casagrande

|I'm getting in a little late on this but my 2 cents is: We have been using no-clean flux for a few years now but up till last month were still cleaning (the white residue) our boards (all thru hole). Finally did some investigation and found the flux

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