Electronics Forum: blister (Page 1 of 12)

ESD blister

Electronics Forum | Tue Jan 22 20:27:28 EST 2002 | davef

Doesn't sound good does it? Consider using your field meter to determine the charge level generated in handling these connectors. Then you can determine the impact of the charge generated and the best handling approach.

hole blister

Electronics Forum | Mon Sep 14 08:07:24 EDT 2009 | davef

You have a board fabrication defect. Search the web for "hole wall pullaway" Performing a microsection is the best way to analyze the defect.

hole blister

Electronics Forum | Fri Sep 18 09:22:03 EDT 2009 | ysutariya

Don't forget the possibility of excess moisture absorption. If this is lead free, then the laminate manufacturers state that you should bake prior to assembly. Was this completed?

Water Absorption of PCB

Electronics Forum | Thu Feb 15 22:55:45 EST 2007 | davef

Questions are: * Is the blistering in the solder mask or the laminate? * If the blistering is in the solder mask, what do the blisters look like [eg, size, quantity, distribution, etc]? * If the blistering is in the laminate, what do the blisters loo

Water Absorption of PCB

Electronics Forum | Wed Feb 21 05:52:17 EST 2007 | Stephen- SMT engineer trainee

Some of the blister in solder mask, normally 1 circle blister(about 1cm in Dim.) in each PCB. In addition, there are also blister in laminate, the also look like 1 circle blister(about 1cm in Dim.) in each PCB.

PCB Blistering / Delamination

Electronics Forum | Tue Jul 18 12:27:29 EDT 2006 | Nick

What are the root failures of PCB Blistering / Delamination? Could layers short together through vias or thru-holes?

Blisters

Electronics Forum | Wed Dec 21 11:49:50 EST 2005 | dlkearns1

We have small blisters all over the bottom side of a heatsink the measures apprx 4" x 12", flat surface. Is there any chance someone can refer me to some standard or specs for usability, personally I think these little blisters would be ok and not in

wave pallets

Electronics Forum | Sun Feb 22 08:23:57 EST 2009 | davef

On a wave solder pallet, we'd expect the metal parts that go through the pallet to be warmer than the pallet material, but we don't expect them to be warmer than the solder. We don't expect a well made board to blister at soldering temperature. So,

Brd(Electroylic Gold finishing) got blisters

Electronics Forum | Sat Aug 27 09:47:05 EDT 2005 | davef

From the pic, we see blistering, but none so close to via that we'd attribute the blistering to via, via plugging, or anything of the sort. When we see blisters like this, we think of a surface contaminant being present on the boards at the time of

Blisters

Electronics Forum | Wed Dec 21 22:31:17 EST 2005 | davef

If we received heatsinks with blisters on the contact surface, like you describe, we'd reject them. We want that surface to be perfectly flat. Google "heatsink flatness" for more. For instance: http://www.heatsink-guide.com/content.php?content=hea


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