Electronics Forum | Fri Apr 03 02:52:42 EST 1998 | Jacqueline Coia
At this moment in time we are using water soluble solder paste on our PCBs these are cleaned using water only, agitated with ultrasonics. After drying a white/grey residue is left around solder joints. Reflow profile is fine and a reliable wash proce
Electronics Forum | Fri Apr 03 08:22:36 EST 1998 | Scott Cook
| At this moment in time we are using water soluble solder paste on our PCBs these are cleaned using water only, agitated with ultrasonics. After drying a white/grey residue is left around solder joints. Reflow profile is fine and a reliable wash pro
Industry News | 2011-01-22 00:27:29.0
Design, assembly, soldering, repair, rework, inspection, and materials choice are all variables to be juggled as electronics manufacturers worldwide work with new component types, high speed signals and lead-free technology. To assist them in making the best choices for producing reliable electronics, IPC — Association Connecting Electronics Industries® is holding the IPC Conference on Quality, Reliability and Acceptability for Electronics Manufacturing in Budapest, Hungary, on 22–24 February 2011.
Industry News | 2010-06-23 12:37:04.0
NASHVILLE — Kyzen, a world leading provider of environmentally responsible precision cleaning products for electronics and high-technology manufacturing operations, announces that Debbie Carboni, Mid-Atlantic Territory Manager, will present a paper titled “Cause, Effects and Solutions for White Residue Formation” at the upcoming SMTA West Pennsylvania Chapter meeting. The presentation is scheduled to take place on Friday, July 23, 2010 at Aerotech’s headquarters in Pittsburgh, PA.
Technical Library | 2020-03-09 10:50:17.0
A customer called the Helpline seeking advice for cleaning no-clean fluxes prior to applying a conformal coating. The customer's assemblies were manufactured with a no-clean rosin based solder paste (ROL0) and were cleaned with an isopropyl alcohol (IPA) wash. After cleaning, a white residue was sometimes found in areas with high paste concentrations and was interfering with the adhesion of the conformal coating (Figure 1). For conformal coatings to adhere properly, the printed circuit board (PCB) surface must be clean of fluxes and other residues. In addition, ionic contamination left by flux residues can lead to corrosion and dendrite growth, two common causes of electronic opens and shorts. Other residues can lead to unwanted impedance and physical interference with moving parts.
Technical Library | 1999-05-07 10:47:00.0
White residue remaining after cleaning circuit board assemblies can be caused by a variety of chemicals and reactions. Rosin and water-soluble fluxes, circuit board resins and epoxies, component materials and other contamination all contribute to this complex chemistry. This paper discusses many of the sources of the residues that seem to be an ever-increasing occurrence.
Heller Industries Inc. | https://hellerindustries.com/solder-balls-defects/
&place machine Excessive solder paste slump after printing Sphere size of solder paste too large for pitch components being soldered Excessive moisture absorbed by solder paste Solder paste exposed
Imagineering, Inc. | https://www.pcbnet.com/blog/5-signs-your-pcb-may-need-to-be-repaired-or-replaced/
: Electrical connectivity issues (including open and short circuits). Cold joints lead to weak bonds and intermittent connections. Solder splatter and flux residue
