Ceramic Coating Basics2 min read

Crosslinking and Adhesion: Why a Hard Film Can Still Detach

Film formation and attachment to the substrate are different questions. A coating that appears hard or dry has not, on that observation alone, demonstrated adequate adhesion to the underlying surface.

Updated · NANOLAB Knowledge

The key distinction

Crosslinking concerns connections within a material, while adhesion concerns the relationship at an interface. In practice, substrate condition, preparation and the selected coating system must also be considered. Buyers should ask what evidence supports the intended interface instead of treating a general cure statement as proof of compatibility with every material.

Practical checks

  1. Define the substrate and any existing finish precisely.
  2. Separate cure observations from adhesion evaluation in the trial record.
  3. Use the supplier-approved evaluation method and acceptance criteria for the proposed use.

Example

Illustrative example: a sample film resists casual handling but lifts from a previously treated panel. The handling observation and the interface failure can both be real. The investigation should preserve the preparation history and layer sequence instead of arguing that a hard film cannot have an adhesion problem.

Scope and limits

Do not perform improvised destructive adhesion tests on customer property. A successful trial on one finish does not validate another finish with different preparation or surface treatment. The purpose of this distinction is to organize evidence, not to diagnose a failure from appearance alone.

Related guidance

Technical references: Evonik: Adhesion promotion. 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.