Pdf Iso -16276-1 [updated] Jun 2026

is the international standard titled "Corrosion protection of steel structures by protective paint systems — Assessment of, and acceptance criteria for, the adhesion/cohesion (fracture strength) of a coating — Part 1: Pull-off testing."

The standard is explicit: random sampling is rarely sufficient. Testing locations must include: pdf iso -16276-1

| Class | Description | Appearance of cut area | |-------|-------------|------------------------| | | Perfect adhesion | Edges completely smooth, no flaking. | | 1 | Very slight flaking | <5% of lattice area affected. | | 2 | Slight flaking | 5–15% affected. | | 3 | Moderate flaking | 15–35% affected. | | 4 | Severe flaking | 35–65% affected. | | 5 | Very severe flaking | >65% affected (or complete detachment). | | | 2 | Slight flaking | 5–15% affected

No. The test requires a dry, accessible surface. For underwater, specialized NDT methods (e.g., cathodic disbonding tests) are used. | | 5 | Very severe flaking |