: 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.
: The force at fracture is recorded (typically in Megapascals, MPa), and the nature of the failure (adhesive vs. cohesive) is assessed visually.
: 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
: A portable tensile tester applies a uniform, increasing tensile force perpendicular to the surface.
: The coating and the face of the test cylinder ( dolly ) are cleaned and degreased.
ISO 16276-1: The Standard for Pull-Off Testing in Corrosion Protection
ISO 16276-1 is primarily designed for of protective paint coatings on steel structures.
: A suitable adhesive (typically a 2-pack epoxy or cyanoacrylate) is used to bond the dolly to the coating surface.
