Receding Contact-Angle Reports: Record How Dewetting Was Produced

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

1. Record the method, liquid and sample condition.
2. Ask the laboratory to explain any special terminology in the report.
3. 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.