Professional Detailing1 min read

Coating Rheology Records: Account for Evaporation During Measurement

A rheology record should explain how the sample remained suitable during the measurement. For materials where evaporation may matter, the laboratory should assess that issue as part of method selection.

Updated · NANOLAB Knowledge

The key distinction

Evaporation can affect rheometry, and the appropriate arrangement depends on the sample and measurement. Preserve the chosen setup and test duration so the report can be reviewed in context.

Practical checks

  1. Ask how the method addresses relevant sample changes.
  2. Record measurement timing and approved environmental controls.
  3. Distinguish an observed trend from a confirmed explanation of that trend.

Example

Illustrative example: a result changes across a long run. The team examines the measurement conditions and sample history before describing the trend as a permanent property of the bulk formulation.

Scope and limits

This article does not authorize a solvent addition, a change to sample concentration or an improvised cover. The laboratory and equipment documentation should determine suitable controls for the actual material.

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.

Professional Detailing2 min read

Coating Rheology: Preserve Pre-Shear and Recovery History

The preparation sequence before a rheology measurement belongs in the test record. Two nominally identical samples may not have experienced the same handling, conditioning or waiting period.