Coating Claims with Percentages: Ask for the Denominator

A percentage in a coating claim needs a defined denominator and measurement. Statements such as easier cleaning, greater gloss or reduced marks can sound precise while describing different quantities. Ask what was counted, measured or timed before interpreting the number as a general performance advantage.

Reconstruct the calculation

For a relative reduction, identify the baseline value and the changed value. An illustrative cleaning task taking 10 minutes before and 7 minutes after represents a 30% reduction in time for that task. It does not establish 30% less chemical use, 30% greater durability or the same saving for every user.

Check whether the claim concerns a relative percentage or percentage points. In an illustrative inspection, moving from 60% to 75% of areas meeting a criterion is a rise of 15 percentage points, or 25% relative to the original 60%. These are different descriptions of the same invented example, not NANOLAB test results.

Ask how the endpoint was measured and whether the comparison kept relevant conditions consistent. A precise formula cannot compensate for an unreliable baseline or an unfair reference surface.

Keep variability and scope visible

Look for repeat observations, sample size and the range of outcomes. One selected trial may not represent ordinary use. Keep preparation, maintenance, substrate and operator conditions attached to the result.

If a supplier cannot provide the underlying definition, treat the percentage as unresolved rather than filling in a convenient meaning. A useful claim explains the measured quantity in ordinary language and provides enough context to assess it. The number should clarify the evidence, not replace the explanation of what the coating was actually shown to change.

Related guidance

• Ceramic Coating Biodegradability Claims: Ask What Was Tested
• Scratch-Removal Percentages: Define the Denominator Before Quoting
• Ceramic Coating Thickness Claims: Ask Which Instrument Measured What
• Ceramic Coating Coverage Calculations: Include the Surfaces You Will Actually Treat

For instructions for your exact NANOLAB product and surface, use the current product documentation or contact NANOLAB.