After two years of work, IPC-WP-019 was approved by consensus. The working group asked the Rhino team to develop a white paper before the requirements were incorporated into IPC J-STD-001. The working group quickly realized that the industry needed a technical explanation of the requirements and advice to facilitate implementation. The working group determined that a qualified manufacturing process was required for manufacturers of Class 2 and Class 3 products.
Over the course of several years and presentations to the IPC J-STD-001 working group, new cleanliness requirements began to emerge. This team included technical subject matter experts from aerospace, materials, automotive and commercial companies. This knowledge and understanding led a small group of dedicated volunteers who called themselves “The Rhino Team” to review the requirements of IPC J-STD-001 and make recommendations for change. From this information, science tells us that the ROSE test is inadequate in these situations.Ī different method or a combination of methods to establish the cleanliness of an assembly is necessary to provide “objective evidence”. The ROSE test is based on spraying / immersing the panel in a 75% alcohol / 25% deionized water solution. Many data sheets indicate that new flux chemistries cannot be dissolved with alcohol or water. With the increasing complexity of assemblies and the evolution of the chemical composition of fluxes and cleaning solutions, the ROSE test, originally developed in the 1970s as a process control method for fluxes based on rosin, was not an adequate test for acceptable levels of ionic residues on the new flow chemistries. This was carried out using the resistivity test of the solvent extract (ROSE) according to IPC-TM-650, method 2.3.25. Until that time, for many years, large facets of the industry used a requirement of 1.56 µg / cm 2 NaCl to determine the acceptable cleanliness of printed circuit assemblies. IPC revision G J- STD-001 requirements for welded electrical and electronic assemblies. This document, a white paper, was published to help the industry understand the new cleanliness requirements in the environment. IPC-WP-019, “An Overview on Global Change in Ionic Cleanliness Requirements”, was originally published in August 2017.
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