DIN EN ISO 17236 – elongation of leather (accredited)

Our laboratory performs testing in accordance with DIN EN ISO 17236 using an accredited procedure. This international standard specifies a standardized test method for determining the permanent elongation of leather. The measurement indicates the extent to which a leather material remains permanently stretched after a defined tensile load—a critical parameter for assessing mechanical performance and dimensional stability in applications where leather is repeatedly subjected to tensile stress and deformation during use. While the method is primarily intended for upholstery and furniture leather, it can be applied to all flexible leather types.

During the test according to DIN EN ISO 17236, standardized specimens are cut from the leather under investigation, conditioned according to defined climatic requirements, and then subjected to a controlled tensile load. The test records both the elongation under load and the residual deformation after unloading, referred to as the extension set. This value is expressed as a percentage of the original specimen length, allowing a technical differentiation between elastic and plastic deformation components.

The resulting permanent elongation values provide reliable information on the load-bearing capacity, flexibility, and long-term mechanical performance of leather materials. These data support material selection, quality assurance, and product development, particularly in industries such as furniture and upholstery, leather apparel, or automotive interiors, where leather surfaces are frequently exposed to mechanical stress.