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Coating Test Arithmetic: Calculate Water Uptake from the Stated Dry Mass

A mass-gain percentage needs a defined starting value. When a test report expresses water uptake relative to a dry specimen, use that specified dry mass as the denominator.

Updated · NANOLAB Knowledge

The key distinction

The arithmetic is mass increase divided by the stated dry mass, multiplied by one hundred. Preserve the specimen definition and the actual test method because the calculation alone does not explain what caused the change.

Practical checks

  1. Record the dry and final masses in consistent units.
  2. Calculate the mass difference before the percentage.
  3. Keep the conditioning and specimen details with the result.

Example

Arithmetic example: a specimen recorded at ten grams dry and ten point two grams after the specified exposure has a mass increase of zero point two grams, or two percent of its dry mass.

Scope and limits

These are hypothetical figures, not NANOLAB measurements. Do not substitute an improvised soaking procedure or interpret the percentage as a complete coating-water-resistance rating without the relevant method and context.

Related guidance

Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.

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