Professional Detailing2 min read

Coating Rheology Troubleshooting: Ask Whether Wall Slip Was Considered

An unusual rheology result deserves a method review before it becomes a product claim. Ask the laboratory whether sample interaction with the measuring surfaces could affect interpretation.

Updated · NANOLAB Knowledge

The key distinction

Wall slip is one possible rheometry error associated with motion at the sample boundary. It should be considered through an appropriate method assessment, not diagnosed from a single headline number.

Practical checks

  1. Share the full measurement record with the laboratory.
  2. Ask which setup checks are relevant to the observed pattern.
  3. Document the interpretation and any approved repeat measurement.

Example

Illustrative example: a buyer sees an unexpected difference between reports and immediately assumes the formulation changed. A method review first examines whether the measurement represented the intended sample behaviour.

Scope and limits

Do not modify measuring surfaces, replace equipment parts or adjust the analysis solely to match an expected result. Follow the instrument guidance and the laboratory's approved investigation procedure.

Related guidance

Technical references: Anton Paar: avoiding rheometry measurement errors. These sources 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.