Repellent finishes mechanisms

Solid particle impact is a common test that is performed to evaluate the mechanical robustness of surface finishes. In this test, sand is typically used which is a mixture of micrometer-sized oxide particles with the silicon dioxide being the most dominant. This test can provide information whether a coating is suitable for use in outdoor applications where eventually it has to withstand harsh weather conditions and contamination/ degradation of the liquid repellent properties by embedded particles on the surface that can disrupt the surface chemistry by their presence or can cause partial destruction of the surface texture due to the impacts. It is also a common test in aerospace applications (e.g. for helicopters) where they... 

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