The PosiTest evaluates the adhesion (pull-off strength) of a coating by determining the greatest tensile pull-off force that it can bear before detaching. Breaking points, demonstrated by fractured surfaces, occur along the weakest plane within the system consisting of the dolly, adhesive, coating layers and substrate.
Surface roughness is directly related to friction behavior. Higher roughness generally increases friction.
The Rz parameter is particularly important for evaluating slip risk, especially for pedestrian movement. Roughness influences how a thin lubricating water film forms between the surface and contact point, which can increase slipping risk in wet conditions.
These measurements can also complement other slip assessments such as pendulum testing and can provide additional insight where full slip testing is not possible.
Basic steps for testing coating adhesion with a PosiTest Adhesion Tester:
Test results can be considered 100% valid when the coating is completely removed from the substrate. When only a portion of the coating is removed, specific results should be noted including the fracture pattern to determine the cohesive properties of the coating and adhesion properties between the dolly and adhesive, adhesive and coating, distinct coating layers, and coating and substrate
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