Ionic Cleanliness of PCB Assemblies: Methods, Evidence and Report Basis

State whether the work supports a process qualification, routine monitoring, incoming evaluation or failure investigation. Identify the PCB assembly, material history and locations or conditions of concern.

Agree the applicable documents, revision and project criteria before testing. Do not assume that a legacy limit quoted online automatically applies to the current product, contract or method.

ROSE-type extraction, ion chromatography, localized analysis and electrical reliability evaluations provide different information. Select the method or combination that addresses the actual process question.

A bulk result can average across an assembly, while a local concern may require a more focused investigation. Record method limitations and any remaining uncertainty instead of treating one report as a substitute for all process evidence.

Record extraction conditions, blank correction and the area convention used by the laboratory. Compare results only when the method and reporting basis support the comparison.

The arithmetic tool accepts uncorrected NaCl-equivalent mass, its matching blank and documented area. Do not enter conductivity, a sum of individual ions or a result that has already been blank-corrected.

Investigate an unexpected result alongside material, handling and process records. Identify who decides the disposition and what evidence is required after a process change or corrective action.

The tool does not measure contamination or issue pass/fail. Send the relevant report and method details with the inquiry so the requested testing or cleaning scope can be reviewed against your product requirements.