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An Overview on Global Change in Ionic Cleanliness Requirements
Overview
For many years, military (e.g., MIL-STD-2000) and commercial (e.g., IPC-J-STD-001) manufacturing standards have required manufactured circuit card assemblies (CCAs) to meet an ionic cleanliness requirement of 1.56 microgram (ìg) of sodium chloride (NaCl) equivalence per square centimeter (cm2) of extracted surface, using Resistivity of Solvent Extract (ROSE) testing per IPC-TM-650, method 2.3.25. This WP-019B was created to support the IPC J-STD-001 Revision H document.
It is the position of the IPC committees that the value of 1.56 ìg NaCl equivalence per square centimeter should be considered as obsolete for the following reasons:
This test methodology was originally developed in the 1970s; it was never intended as a cleanliness test, nor as a test for product acceptability, but only as a process control method. The use of the ionic contamination value as a measure of product acceptance was the result of a US Department of Defense desire to implement pass/fail criteria.
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