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This standard provides a rigorous, standardized methodology for measuring the of protective coatings—a term that encompasses both adhesion (bond to the substrate) and cohesion (internal strength of the coating). 1. Scope and Application
The standard, officially 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" , is a critical benchmark for quality control in industrial coating applications.
: For many applications, a circular cutting tool is used to cut through the coating down to the substrate around the dolly to isolate the test area. pdf iso -16276-1
: The coating and the face of the test cylinder ( dolly ) are cleaned and degreased.
: Users should note that pull-off testing is a destructive process . Areas tested will require repair once the test is completed, the extent of which depends on the project specification. 2. The Pull-Off Testing Procedure : For many applications, a circular cutting tool
: The procedures are applicable to coatings of any thickness .
: The force at fracture is recorded (typically in Megapascals, MPa), and the nature of the failure (adhesive vs. cohesive) is assessed visually. Areas tested will require repair once the test
ISO 16276-1: The Standard for Pull-Off Testing in Corrosion Protection
: It traditionally applies to steel substrates with a thickness of at least 10 mm . However, the updated ISO 16276-1:2025 edition expands this scope to include substrates as thin as 3 mm .
The core of the standard is the , which measures the force required to detach a coating from its substrate. Core Steps in Testing :