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A thin, uniform layer of adhesive is applied to the dolly face. The dolly is then pressed firmly onto the coating surface. Excess adhesive squeezed out around the edges must be carefully wiped away before it cures. Step 3: Curing the Glue
A metal dolly (typically 20 mm diameter) is glued perpendicularly to the cured coating. After adhesive curing, a hydraulic or mechanical pull-off tester applies a steadily increasing tensile force until the coating system fails. The (in MPa or psi) is recorded, along with the failure mode (where the break occurred).
: The force at fracture is recorded (typically in Megapascals, MPa), and the nature of the failure (adhesive vs. cohesive) is assessed visually. pdf iso -16276-1
: Results must include the fracture strength (in MPa), the percentage and type of failure (adhesion vs. cohesion), and the equipment model used. ⚠️ Critical Notes
: Tension must be applied perpendicularly at a uniform rate, not exceeding 1 MPa/s , with fracture occurring within 90 seconds. A thin, uniform layer of adhesive is applied
The standard outlines the specific conditions under which its procedures are valid. The latest revision, ISO 16276-1:2025, applies to:
The standard provides a framework for uniform testing and objective acceptance: 1. Test Equipment (Apparatus) Step 3: Curing the Glue A metal dolly
ISO 16276-1 focuses on a critical parameter of protective coatings: their ability to remain attached to the steel substrate (adhesion) and resist breaking apart within their own layers (cohesion). The standard uses the umbrella term to encompass both properties.
A critical provision of ISO 16276-1 is that . Therefore, contracts must explicitly specify the following variables prior to starting work: The target fracture strength value (e.g., in MPa).
ISO 4624 describes how to perform the test. ISO 16276-1 describes how to pass/fail based on that test, in the context of an anti-corrosion coating system.