smearresistant

Smear resistance, sometimes written smearresistant or smear-resistant, describes the ability of a surface, coating, or material to resist leaving smears or smudges when touched, rubbed, or exposed to moisture, oils, or mechanical contact. It is a desirable attribute in printing inks, coatings, textiles, cosmetics, and display technologies.

The performance depends on formulation and surface properties. In inks and coatings, smear resistance arises from fast drying and the formation of a robust, continuous film from binders and pigments. In oleophobic or hydrophobic coatings, surface energy and repellency reduce transfer of contaminants. The substrate condition, including porosity and roughness, as well as environmental factors such as humidity and temperature, also influence results. Additives, crosslinking, and drying time can further improve smear resistance.

Testing and measurement of smear resistance typically involve standardized rubbing or smearing tests. A surface is subjected to a defined load and speed using a cloth, finger, or instrument, sometimes under wet or oily conditions, and the degree of smearing is graded or quantified as a smear index or similar metric. Procedures and standards vary by industry, including printing, coatings, cosmetics, and display technologies.

Applications of smear-resistant properties span multiple sectors. For printers and paper products, higher smear resistance enhances legibility and appearance. For touchscreens and displays, anti-smear or oleophobic coatings reduce fingerprints and residue. In cosmetics, products are marketed as smear-resistant or smudge-proof to indicate resistance to transfer during wear. In textiles and industrial finishes, smear resistance contributes to durable color transfer resistance and cleaner surfaces.