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In Chapter 5.4 flexibility was discussed as a property of organic coatings attached to substrates. In this section tensile strength and elongation will be discussed as properties belonging to unsupported films of organic coatings. Webster defines tensile strength as “the greatest longitudinal stress a substance can bear without tearing apart” and elongation as “the total deformation in the direction of load or per unit of length caused by a tensile force or the maximum permanent stretch per unit of original length induced in a body by a force that causes it to break.” These definitions are quite adequate as a starting point to discuss the measurement of these properties for organic coatings, but they do need some interpretation.