Full Site - : bubbles in pcb solder mask (Page 3 of 7)

defects in pcb manufacturing

Electronics Forum | Fri Oct 30 10:36:26 EDT 2009 | richie_puthotta

Hi, I see a huge solder mask shift on chip comp pads. This would result in mid-chip solder balls or solder beads. Overall, the solder mask workmanship is not acceptable. Mask is on pad.

defects in pcb manufacturing

Electronics Forum | Sun Nov 01 23:51:44 EST 2009 | boardhouse

Hi Julie, My opinion is that the top board would not pass IPC, solder mask encroachment on pads. Second board is what we call Orange peel,this can be caused two way's. 1) the solder mask was not tack dried enough prior to imaging which caused artwo

defects in pcb manufacturing

Electronics Forum | Sun Nov 01 01:33:52 EST 2009 | isd_jwendell

Just my opinion: Top pic - Solder mask registration WAY too far off, without a doubt I would reject. Bottom pic - I would worry that there was/is a contamination that caused the poor looking mask. This may be cosmetic only, but unknown. I would rej

defects in pcb manufacturing

Electronics Forum | Tue Nov 03 20:00:47 EST 2009 | davef

Solder Mask Adhesion Pull Test Tape List IPC-TM-650 Test Method 2.4.28.1, Adhesion, Solder Resist (Mask), Tape Test Method, defines the procedure for determining the adhesion of solder resists (masks) used over melting metals, (such as solder plated

defects in pcb manufacturing

Electronics Forum | Tue Oct 27 22:52:18 EDT 2009 | davef

Top picture: We're not wild about the 'poor registration,' the differing thickness of the solder mask, and the crud all over the board. But, then again, we don't have a basis for rejection. Bottom picture: No basis for rejection Help us out, what do

Ammonia in Peelable solder mask compatability to lead free

Electronics Forum | Wed Jun 22 14:14:42 EDT 2005 | Steve

Tin/Lead we have had no problem in masking off areas on a pcb during wave soldering. Lead Free alloys, Nickel Silver Copper would there be any compatability issues with a Peelable latex solder mask containing Ammonia. Really hot need to know.

Bubbles in conformal coat

Electronics Forum | Thu Aug 27 11:35:07 EDT 2009 | davef

There are many possibilities: * Conformal coat is incompatible with surface residue on the board * Conformal coat is incompatible with solder mask on the board * Moisture is out-gassing from the board * Conformal coat is too thick and does not allow

Nodules in barrel plating

Electronics Forum | Mon Sep 11 14:07:26 EDT 2000 | Steve

Hi ya'll!! We've got some PCB's in receiving inspection that has these little nodules in plating inside all of the barrels. These are microwave PCB's and have almost all of the surface area on both sides covered with with solid metal planes, and no

Solder Balls in Boards

Electronics Forum | Mon Jun 21 11:14:25 EDT 2004 | exmaintenanceleader

Dear Kanwaljit Singh, my opinion is following: 1)solderpaste type is ok - usual (alpha-metals has this problem inside the paste paste- holder problem) - what do the operator when production change -clean well the stencil holes!! no visible rest on

Question of delamination in PCB

Electronics Forum | Sat May 09 09:40:12 EDT 2009 | davef

The whitish tin layer and the solder mask appear to be incompatible, resulting in adhesion loss.


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