Electronics Forum | Thu Apr 03 22:56:48 EDT 2008 | davef
Potential impacts of using expired solder paste are [University of Bolton]: * Changed paste rheology. Result: poor print quality * Loss of solvents. Result: reduced flux activity * Changed flux formulation. Result: More difficult to clean flux residu
Electronics Forum | Wed Jan 30 05:36:04 EST 2002 | vincent_f
Hello everybody, I would like to use PCB which have expired. I have already planned to bake them in order to avoid pop corn effect but I wonder about some few items : 1) How can I identify the optimal baking parameters ? 2) Even after baking, is the
Electronics Forum | Wed Jan 30 17:49:41 EST 2002 | davef
PCB never expire, they just become more difficult to solder. [Many shops impose �shelf life� periods for their boards, but they aren�t going to discard the boards if the exceed the limits, unlike they would with some other process materials.] IDENT
Electronics Forum | Fri Feb 01 08:35:18 EST 2002 | gregers
PWB shelf life: HASL---3mth ENTEK-- 2mth Before using expired PWB, it is suggested to go thru HASL or ENTEK angain. Ask your VDR to serve this. Re immersion Au, mostly when the thickness under 3u"(micro pores present), the surface gold will serve a
Electronics Forum | Mon Jul 13 06:02:08 EDT 2015 | piyakorn
Hi All Some our customer has a new order but has been stopped long time ago (2012) which ENIG PCB in our raw material stock that are date code xx12 (still be vacuum sealed with silica gel) so,Will there be any risk or not? Help me please. Than
Electronics Forum | Fri Jul 24 16:33:45 EDT 2015 | cnotebaert
You should be fine! best practice for a situation like this would be to run a solder sample, either flux it and run through wave, or screen print, don't place parts and run through reflow. look for proper wetting characteristics if you see de-wetting
Electronics Forum | Fri Apr 23 17:59:54 EDT 2010 | hegemon
Therein lies the issue. Unknown storage conditions before we received the PCBs, date codes just expired (2 weeks), first article is de-lam city! Had a bad feeling about it. Have read some studies showing that there is no linear tie in of visual cha
Electronics Forum | Mon Sep 17 15:27:51 EDT 2001 | jschake
Challenges: The basic defects that impact assembly yield are bridging, satellite solder balls, and opens (i.e. tombstones / draw bridges). There are many variables with the stencil printing process that can impact these; several of them are listed
Electronics Forum | Thu Jan 05 08:53:21 EST 2023 | tommy_magyar
Check manufacturing date code (if you can) on the reels against your receipt of the material. If you are a contract manufacturer you could make a supplier quality claim if they have sent you expired components (and you did not know). A relatively eas
Electronics Forum | Wed Dec 04 17:53:22 EST 2002 | dave edwards
You wanted someone from Loctite to add their opinion on the matter. Our official statement on expired material is that after the expiration date we can not certify the performance and/or quality of the material. Although most likely the material is g
