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The goal of the contribution was to perform the research about the way of failure of tin coatings and their causes and about behaviour of tin coatings at the limit states of deformation. The work shows that in the maximum plastic strain area the failure of tin coating was mainly due to transversal cracks without separation of the coating particles and decohesion at the coating-substrate interface. As an additional tin coating quality test, it would be advisable to include qualitative EDX analysis of tin coating in the area of uniform and maximum plastic strain of the surface of test specimens after a uniaxial tensile test.