How to Perform PCB Surface Cleaning and ROSE Testing

What is ROSE Test (Resistivity of Solvent Extract)?

PCB Surface Cleaning and ROSE Test: How to Perform Ion Residue and Pure Water Analyses?

Today, the production of electronic circuit boards requires precise cleaning processes and the use of high-purity water. Just as advanced production technologies are crucial, the analysis and verification stages of these processes have become an indispensable part of quality assurance. In particular, PCB (Printed Circuit Board) cleaning efficiency, monitoring chemical residues, and tracking pure water parameters are priorities for many industries.

What is the ROSE Test (Resistivity of Solvent Extract)?

The ROSE test, applied in accordance with the IPC-TM-650 2.3.25.1 standard, is a fast and practical method used to analyze ionic contaminants remaining on the surface of printed circuit boards. Basically, it involves extracting the PCB in a specific solution and measuring the conductivity of this solution to determine the ionic cleanliness level (µg/cm²) in NaCl equivalents.

Why is it important?

• Verification of post-production cleaning quality
• Prevention of residue-related failures
• Compliance with customer acceptance criteria

Residue Analysis by Ion Chromatography

This method, based on the IPC-TM-650 2.3.28 standard, enables the quantitative determination of residues on PCB surfaces in the form of anions, cations, and weak organic acids. Unlike the ROSE test, it provides detailed information based on ion type.

Detectable Ions:

• Anions: Cl⁻, SO₄²⁻, NO₃⁻, PO₄³⁻
• Cations: Na⁺, K⁺, NH₄⁺, Ca²⁺
• Organic acids: Acetate, Formate, Malate

💧 Monitoring Pure Water Quality

Pure water is one of the most commonly used raw materials in electronic, medical, pharmaceutical, and cosmetic production. Therefore, its chemical and microbiological purity level must be carefully monitored at every stage of production.

Basic Parameters and Methods:

Regulatory Compliance and Reporting of Analyses

Nanolab reports these analyses in accordance with both TÜBİTAK-supported projects and ISO 17025 accreditation requirements. We provide our customers with the requested analyses as follows:

• Method references,
• Sample preparation protocols,
• NaCl equivalent calculations,
• ppm-based ion reports are provided.

Why NANOLAB?

• Reliable results with our TÜRKAK-accredited infrastructure
• Full compliance with international standards such as IPC, ISO, ASTM, and EPA
• Advanced IC, ICP, and FTIR infrastructure for high-purity chemical analyses
• R&D-supported analysis, validation, and consulting services

Optimizing PCB cleaning, maintaining production processes under control, and documenting pure water quality—the right analysis partner for companies seeking these solutions: NANOLAB.

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