Electronics Forum: storage fr4 (Page 1 of 2)

temperature range

Electronics Forum | Mon Nov 20 04:39:19 EST 2000 | SV

Hello, I have to design a PCB for which the customer have the following temperature requirements: -55degC to +85degC operating temp. -61degC to +125degC storage temp. My question is: does the FR4 material meet this conditions? Which are the parame

Do yo have to bake unused bare boards or just Vacuum Pack?

Electronics Forum | Thu Aug 24 15:54:13 EDT 2006 | davef

It depends. What is: * Storage environment and period * Board laminate, epoxy, and copper thickness of PTH * Down stream process * Etc FR4 0.062" thick boards absorb between 0.08 to 0.1%Wt of moisture within a 24 hour period, and 0.2 to 0.23%Wt in

PCB Baking

Electronics Forum | Fri Feb 28 01:10:32 EST 2003 | MA/NY DDave

Hi I don't know what FR4 you are using, so check it out to make sure 125 isn't too high. I have seen this done occassionally when the PCBs have bad moisture or other problemx where baking helps prior to assembly and solder, yet I haven't seen it do

Storage Conditions for Finished Goods

Electronics Forum | Mon Jan 10 13:59:54 EST 2005 | mdemos1

Hi. I am looking for information on storing completed PCBAs in a warehouse environment. My current assemblies use standard FR4 material - 4 to 6 layers. Component types range from 0402s to fine pitch QFPs and micro-BGAs. If I were to store this i

What is the MSL of a PCB

Electronics Forum | Tue Jan 13 15:48:58 EST 2015 | natashakt

170 degrees Celsius) and regular FR4 materials. I am trying to see if we can use table 5 on page 14, "Recommended Equivalent Total Floor Life (Days)" to find out how long (at specific humidity and temperature) our populated and unpopulated PCB's can

Re: Baking FR-4 PWB's prior to reflow

Electronics Forum | Wed Mar 29 04:14:49 EST 2000 | Marc

Charlie B: You mentioned that you have an air conditioned environment and a RH 0rf 50, baking the boards is predominately done when the history of the PCB delivery and / or previous storage conditions are un known. When I was with a CM, we did this a

Re: temperature range

Electronics Forum | Mon Nov 27 17:44:10 EST 2000 | Dave F

Gawd. Sure FR-4 will meet those conditions. Tg [check the fine SMTnet Archives for discussion on Tg] of FR-4 is 130�F or so. Consider: * Is the delT between Tg and the upper operating [or storage] temperature acceptable for your application? * D

Questions About Risk of PCB Delamination as a Result of Moisture Build Up After Damage to Solder Mask

Electronics Forum | Tue Apr 23 15:36:27 EDT 2019 | davef

Josh, are you setting someone up with these questions? Answers to your questions related to the subject line follow: Q1. Does the Epoxy Solder Mask Layer of a PCB protect against moisture absorption? Is this a primary function of the solder mask?

Re: Contamination causing shorts.

Electronics Forum | Sat Sep 25 07:07:02 EDT 1999 | Brian

I need a memory jog. What is the term for the growth of conductive contamination after a board is in storage or field? There are several different mechanisms which can cause this. In reality, ionic contamination is the root cause for many of the

Teflon PCB's

Electronics Forum | Fri Oct 26 17:01:52 EDT 2001 | davef

We process no Teflon boards. Companies, such as Rogers and Taconic, make laminates of Polytetrafluoroethylene [PTFE] er �Teflon�. Common �Teflon� laminates are: * Woven glass / PTFE * Random microfiber glass / PTFE * Ceramic / PTFE * Woven glass /

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