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Coating XPS Reports: Distinguish Atomic Percent from Weight Percent
Atomic percentage counts relative atoms, while weight percentage describes relative mass. The two quantities are not interchangeable.
Updated · NANOLAB Knowledge
Practical approach
Preserve the reported units and ask the analyst which conversion, if any, is justified for the sample and method.
A table headed atomic percent cannot be copied into a product specification headed weight percent without a valid calculation and scope.
Decision limits
Do not infer a formulation recipe from a surface-analysis percentage table.
Related guidance
- Percent Change vs Percentage Points in Coating Trial Reports
- Ceramic Coating Test Reports: Handling an Outlier
- Coating Measurement Reports: Preserve Instrument Settings
- Coating Microscopy Images: Keep the Scale Bar and Sample Context
Method reference: Thermo Fisher: XPS surface analysis. References describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.
Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.
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Percent Change vs Percentage Points in Coating Trial Reports
Calculate relative percent changes and percentage-point changes correctly, with counts and consistent outcome definitions.
Ceramic Coating Test Reports: Handling an Outlier
Investigate an unusual coating test result with a documented process instead of automatically deleting it or treating it as definitive.
Coating Measurement Reports: Preserve Instrument Settings
A number without its method settings may be impossible to reproduce. Saved settings are part of the measurement record.