Sparse Surface Contamination Can Undermine an Otherwise Compatible Adhesive Bond

What the evidence preview establishes

The failure was entirely interfacial at the package surface. Sparse sodium-, sulfur-, chlorine-, and potassium-bearing contamination may have reduced adhesion, although the magnitude of its contribution could not be established.

Why this case matters

A chemically compatible adhesive can still fail at a poorly prepared interface. Examine both sides of the separation, map sparse contamination across and beyond the bond zone, and verify cleaning and cure records before assigning the failure to adhesive identity alone.