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Coating Viscosity Reports: Record the Spindle and Speed
A rotational-viscosity result needs its test conditions. Spindle and speed are part of the method, especially for materials whose response depends on shear.
Updated · NANOLAB Knowledge
Practical approach
Match the agreed instrument setup, sample quantity and measurement timing before comparing batches.
Two results expressed in the same units may not be comparable if obtained under different conditions.
Decision limits
Do not declare a batch change from the numbers alone when the measurement setups differ.
Related guidance
- Standard Deviation vs Standard Error in Coating Test Reports
- Comparing Coating Viscosity at Different Temperatures: Build a Fair Test
- Dynamic and Kinematic Viscosity in Coating Specifications
- Coating Flow-Cup Tests: Seconds Are Specific to the Cup
Method reference: BYK-Gardner: viscosity measurement. References 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.
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Standard Deviation vs Standard Error in Coating Test Reports
Distinguish standard deviation from standard error and label coating-test error bars so process variation is not hidden.
Comparing Coating Viscosity at Different Temperatures: Build a Fair Test
Compare coating viscosity at consistent sample temperatures and distinguish ordinary flow changes from possible storage damage.
Dynamic and Kinematic Viscosity in Coating Specifications
Dynamic and kinematic viscosity use different quantities and units. Density connects them under the appropriate conditions.