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Made in the USA

QUALITY CIRCUITS, INC. LEADS THE CIRCUIT INDUSTRY IN BARE PRINTED CIRCUIT BOARD CLEANLINESS REQUIREMENTS.

WHY IS THIS IMPORTANT? With the current use on circuits board surface of no-clean fluxes and the elimination of hydrocarbons from the cleaning process, Ionic Contamination can remain on the circuit board surface and be encapsulated into the finished assembly. These entrapped contaminates can lead to dendritic growth and long-term assembly failures.

WHAT IS DENDRITIC GROWTH? Dendritic growth occurs when a contaminate such as a Chloride Ion combines with moisture, the condustive circuit, and an electrical current to create a miniature voltaic cell. This cell can grow an ionic short between adjacent circuits causing circuit failure long after successful in-circuit testing is completed.

HOW CAN THIS BE PREVENTED? By starting with the cleanest bare printed circuit boards possible, long-term failures attributed to dendritic formation is significantly reduced.

Quality Circuits, Inc. Solution:

  1. Deionized water is utilized in all critical processes.
  2. A final cleaning step, incorporating a chemical saponifier, is performed on all parts once all processing and inspection is complete.
  3. A similar cleaning step incorporating an additional chemical saponifier is performed immediately following hot air leveling, the major source of ionic contamination.
  4. Special handling techniques are employed to eliminate recontamination.
  5. Product is periodically verified for contamination levels via liquid ion chromatography. Contaminant measurement, via liquid ion chromatography, far exceeds the capability of the “Industrial Standard” Omega Ion Contamination meter.

Quality Circuits’ Ion Chromatography Results
Ionic Species Tested For: Anions: Chloride, Bromide, Sulfate, and Weak Organic Acid (W.O.A.).

Mean Results based on Micro-Grams Per Square Inch:

  • Chloride: Less than .80
  • Bromide: Less than .15
  • Sulfate: Less than .60
  • W.O.A. Less than .01

TOTAL COMBINED CONTAMINATES: LESS THAN 1.60

* Industry standards based on Omega Ion Contaminate Meter results are 10 Micro