Contrast-based evaluation of mar resistance of thermoplastic olefins

The physical aspect of mar behavior is studied by applying a standardized progressive sliding load methodology to smooth and textured automotive-grade thermoplastic olefins. It is shown that surface texture has a strong effect on light scattering and, hence, the propensity for mar visibility. It is also shown that digital imaging via a desktop scanner can be used to quantitatively and objectively assess mar resistance using contrast as a basis. Incorporation of slip agent definitively improves the mar resistance for both types of surfaces. Relationships between contrast, gloss and surface roughness in relation to mar visibility are discussed.

► Study on physical aspects of mar behavior.
► Contrast is a highly effective metric for assessing esthetic quality.
► Shows that visibility of surface deformation result as a consequence of either “whitening” or darkening of the surface.
► Rough or textured surfaces tend towards darkening while smooth surfaces tend towards “whitening”.
► Image analysis can be automated using software.