The GMW 14130 standard, developed by General Motors , defines a test method for determining a surface's ability to resist friction or marring. Friction is when permanent damage occurs to the coating. For example, visible flaking of the coating caused by a paperclip, or a crack in the finish. Marring, on the other hand, is when there is no cracking or penetration in the coating, only visible grooving or scratching. This may or may not be permanent. For example, a scratch created by a paperclip that does not crack or permanently damage the coating. The test method described in this standard does not replace existing laws and regulations.
The GMW 14130 standard applies to plastic films, vinyl, leather and similar materials used in automotive interior applications.
Scratches and mar are types of mechanical surface damage that occur during normal use and handling, shipping or assembly activities. Marring or friction is defined as the resistance to penetration by an edge or ridge on a second body moving across the surface of a solid body and is usually associated with a single occurrence on the sample surface. Friction involves some deformation, but can also include material cracking, peeling, and removal. In contrast, marring describes relatively fine surface scratches characterized by generally shallow damage, often scattered over a relatively large area, which typically degrades the appearance of the surface coating. It is more convenient to think of marring resistance as a surface property, whereas scratch or abrasion resistance includes the body of the material.
For laboratory friction and marring tests, a stylus with a given geometry is drawn along the sample surface at a known speed and with a known force. The purpose of most scratch or marring resistance studies is to determine the behavior of the material under certain test conditions, to establish a relative ranking of similar materials, or to determine the failure limit of a surface coating.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides marring or friction resistance testing services within the scope of the GMW 14130 standard, with its trained and expert staff and advanced technological equipment.
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