Standard · Adhesion, cure and holidays
ASTM D4541
Pull-off adhesion with portable testers.
ASTM D4541 measures the pull-off strength of a coating on metal with a portable tester. It is the US counterpart of ISO 4624. Adhesion testing is a CIP Level 2 subject; destructive tests are outside the scope of CIP 1.
Methods and protocols
- Methods B to F: five types of tester. Results from different types are not comparable, so the report names the type.
- Method A was removed. Pull-off on concrete has its own standard, ASTM D7234.
- Protocol 1 pulls to fracture and is the default. Protocol 2 pulls to a set value and records pass or fail.
Reporting the break
Report the stress, in psi or MPa, with where the break ran. The usual way to name it is the letter scheme of ISO 4624: A/B for steel to the first coat, B within the first coat, -/Y for the last coat to the glue, Y/Z for glue to dolly. Give each share to the nearest 10 %.
Reading a glue break
A break in the glue shows only that the coating held to at least that stress. It does not show where the coating would fail. What to do next is for the specification or the job procedure to say.
5 practice items in the members area mention ASTM D4541 (CIP 2: 5).
Related
Try it in an exam-style question. The free readiness check shows the question style, explains every answer and gives you a dated study plan.
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Also published openly: Elcometer 510 pull-off tester instructions, nature of fracture codes.
This page describes the subject of ASTM D4541 in our own words; it does not reproduce the standard. For the full text, buy the current edition from ASTM International. Checked on 2026-10-14; errors go in the corrections log. CoatMentor is an independent study aid. It is not affiliated with ISO, AMPP, SSPC, NACE International, ASTM or FROSIO.