Professional Detailing2 min read

Coating Laboratory Results in Different Units: Convert Before Comparing Limits

A result and an acceptance limit must use compatible units and the same quantity basis before comparison. A correct-looking number can produce the wrong decision when a unit prefix or concentration basis is overlooked.

Updated · NANOLAB Knowledge

The key distinction

Keep the original report intact and perform conversions in a separate, traceable field. State the conversion factor and check whether the values concern mass, volume, area or another denominator. Not every conversion is possible from units alone; some require density, specimen area or additional method information.

Practical checks

  1. Identify the quantity and full units on both sides of the comparison.
  2. Obtain any additional information required for a valid conversion.
  3. Check the arithmetic independently before applying a pass decision.

Example

Arithmetic example: a concentration reported in milligrams per kilogram cannot be compared directly with a limit written in grams per kilogram without converting the prefix. A result per litre may require further information before comparison with a mass-based limit. Similar-looking numbers are not enough.

Scope and limits

Do not remove units to simplify a chart or assume a missing denominator. This guide does not establish an acceptance threshold. When the reporting basis is unclear, ask the laboratory or specification owner to resolve it before accepting or rejecting a coating batch.

Related guidance

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

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