Choosing a Coating2 min read

Coating Trial Rankings: Show Ties Instead of Forcing a Winner

A trial does not always produce a defensible winner. If observed differences are too small or inconsistent to support the intended decision, report a tie or an unresolved comparison rather than creating a ranking from extra decimal places.

Updated · NANOLAB Knowledge

The key distinction

Establish what would count as a meaningful difference before testing. Consider the consistency of the observations and the practical consequence for the customer. Two samples may be indistinguishable for the measured outcome while differing in documentation, approved use or supply format. Keep those separate considerations visible instead of pretending the test settled every question.

Practical checks

  1. Record the individual results and the relevant measurement or scoring limitations.
  2. Compare the difference with the practical threshold agreed for the task.
  3. If the evidence does not distinguish the candidates, state that outcome and identify the next useful decision criterion or targeted check.

Example

Illustrative example: two products receive nearly identical appearance scores from several reviewers, with preferences changing between samples. A forced first-and-second ranking would exaggerate the evidence. The buyer can acknowledge the tie and compare other verified requirements without claiming a superior finish.

Scope and limits

A tie does not prove that the products are chemically identical or equivalent in every use. It means the particular assessment did not justify separating them. Avoid publishing a best-product claim that the method and observations cannot support.

Related guidance

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