Protective film residue testing should use the real protected surface, defined dwell time, removal method and visual acceptance standard.
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Key points
Test on the final protected surface, not only on a clean lab panel.
Compare short dwell, aged dwell and heat exposure when relevant.
Record residue, ghost marks and surface damage separately.
Use the real protected surface
Clean lab panels are useful for comparison, but they do not replace painted metal, coated plastic, polished sheet or another production surface.
Prepare more than one specimen so short dwell, aged dwell and heat exposure can be compared without reusing the same area.
Separate three different failures
Adhesive residue is transferred adhesive. A ghost mark can come from pressure, moisture or a temporary optical change. Surface damage means the protected coating or finish has changed.
Photograph the surface under the same light, record the removal method and agree on the acceptance standard before the test starts.
Transferred adhesiveGhost or optical markCoating damageRemoval force and method
Before requesting a sample
Turn the article into project information
Confirm substrate and surface treatment.
Record coating, bonding or installation method.
Define the failure or target performance.
Use a named test condition and acceptance method.
List required documents: TDS, SDS, COA or sample.
Related applications
Open the application route to review substrates, process factors, failures, product options and sample details.
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