Electronics Forum | Sat Mar 14 15:48:40 EDT 2015 | horchak
The white haze is definitely an indication of moisture being trapped in uncured or improperly applied solder mask. You can verify this by heating up the board using a heat gun on an area of the board with the white haze, and if it clears up that is t
Electronics Forum | Tue Sep 10 22:29:01 EDT 2002 | scottefiske
Many times after initially cleaning in the solvents recommended by the paste/material manufacturer, a light white haze may still be visable...try using a soft bristle brush to remove the remaining residues. By this time the residues that remain will
Electronics Forum | Sat Nov 08 08:16:45 EST 2003 | davef
We saw this quite a bit, I want to say 5 or 6 years ago, but it's probably more like 10 years ago. It's caused by poor solder mask crue. Talk to your board fabricator about solutions.
Electronics Forum | Thu Feb 16 11:42:29 EST 2006 | russ
I use Alpha 857 W.S. for wave is that what you mean? If so, I love this stuff, it solders everything. one downside to it is convection (wave , rework) can dry it out and leave white hazes and even residues at the joints.
Electronics Forum | Tue Sep 01 06:55:22 EDT 2009 | davef
Rocko: While you're rooting around with the cleaner to better understand the issues with your water supply, monitor the heaters of your cleaner. We've had instances were the heater control has created "white haze" problems. Are you sure the residue
Electronics Forum | Fri Nov 07 12:48:31 EST 2003 | rholland
I have seen in the last couple of months more boards with a white hazing under the solder mask. I ran a few tests on a board to determine the cause of the white hazing underneath the solder mask. First I confirmed, or at least I think I confirmed, t
Electronics Forum | Fri Oct 08 16:58:01 EDT 1999 | Dave F
| | Hi everyone, I am having a problem with cleaning PCB's with different finishes. I run one type of board through a drag solder and it comes out perfect using a water slouble flux then putting it in an aqueous cleaner. Then I run another board with
Electronics Forum | Wed Feb 24 07:28:40 EST 2010 | drt
Agree with what has been said so far. Check with your end customer and make sure the white haze appearance of the board will be acceptable. You will never get the board to look like it did before you started. It may be clean but it won't look like t
Electronics Forum | Wed Nov 09 09:45:34 EST 2011 | dyoungquist
The white haze is most likely coming from your ultrasonic air humidifiers. I have seen this from a home unit that left a white residue on furniture in the house. What is your water source for the humidifiers? If it is hard water you will get more
Electronics Forum | Tue Jan 22 20:26:18 EST 2002 | davef
Help us visualize this better. * What color white [ie, yellow/white, green/white, a haze, etc.] are we talking about? * What size and shape are the spots? * Where are the spots located? * Etc Help us understand what�s going on by describing the sp
