What exactly is coating impact resistance?

Let’s take pipelines as an example. During installation, they may suffer from bumps, pressure fluctuations from internal fluids, or external environmental impacts. At such times, the coating on the pipe’s surface must be tough enough to resist these external forces without cracking or peeling. To evaluate impact resistance, we used a professional coating impact tester.

The core purpose of this test is to assess the flexibility and adhesion of the coating when subjected to high-speed loads and physical stress. Simply put, we observe how deformation of the substrate affects the coating.

There are two main methods for testing: direct impact and reverse impact.

• Direct impact focuses on the outward-facing side of the coating.

• Reverse impact examines the side in contact with the substrate.

During the test, we gradually increase the drop height of the weight on the tester—by 5 cm increments—until deformation and cracking appear on the coating surface. The final height at which visible damage occurs is recorded as the coating’s impact resistance rating.

(Note: The impacted area must be at least 10 mm from the sample’s edge, and the distance between any two impact points should also be greater than 10 mm to ensure accuracy.)

After testing, we inspect the sample under sunlight or constant lighting. In some cases, a magnifying glass is used for closer examination. We repeat the test until cracks appear on the coating surface. In the industrial coatings industry, impact resistance is a critical performance metric, directly influencing the product’s real-world protective effect.

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