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Receding Contact-Angle Reports: Record How Dewetting Was Produced
A receding-angle result should identify how the liquid boundary moved during measurement. Different arrangements need technical interpretation before their results are treated as interchangeable.
Updated · NANOLAB Knowledge
The key distinction
KRUSS describes several ways to examine dewetting, including volume reduction and force-based methods. The buyer should preserve the actual procedure rather than reporting only a number under the general heading water repellency.
Practical checks
- Record the method, liquid and sample condition.
- Ask the laboratory to explain any special terminology in the report.
- Compare like procedures or use a justified technical correlation.
Example
Illustrative example: one report uses a conventional receding-angle procedure while another describes a recently receded angle. The similar names should not erase the distinction made by the method provider.
Scope and limits
Do not assume a single angle predicts how every droplet or contaminant will leave a surface in service. Keep the claim within the tested condition.
Related guidance
- Contact-Angle Reports: Read Left and Right Angles Before Averaging
- Coating Contact-Angle Tests: Control the Time After Drop Placement
- Coating Rheometer Reports: Record Geometry and Gap
- Pendant-Drop Density Inputs: Identify Both Phases
Technical references: KRUSS: receding contact angle. 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.
Continue reading
Contact-Angle Reports: Read Left and Right Angles Before Averaging
Unequal left and right drop profiles can signal a geometry or surface issue worth reviewing. An average can conceal that asymmetry.
Coating Contact-Angle Tests: Control the Time After Drop Placement
A contact-angle observation is associated with a measurement time. Comparing an immediate image with a later image introduces a timing difference.
Coating Rheometer Reports: Record Geometry and Gap
A coating rheology comparison should identify the measurement geometry and gap, alongside the result. Missing setup details can make an apparently precise comparison difficult to reproduce or assess.