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Viscosity describes how easily a liquid flows. A high-viscosity coating is thick and slow moving; a low-viscosity one is thin and runny. For paints and coatings this single property influences almost every stage of use, from how a product is pumped and dosed in production, to how it atomizes at a spray gun, to how…

Viscosity is a fluid's resistance to flow. In paints and coatings it governs how a product brushes, sprays, rolls, levels, and resists sagging, and it is one of the most routinely checked quality parameters on the line and in the lab. A coating that is too thick drags and clogs; one that is too thin…

Key terms Term  Definition  Viscosity  A fluid's resistance to flow.  Dynamic viscosity  Resistance to flow under an applied shear, measured in pascal seconds (Pa.s), poise (P), or centipoise (cP).  Kinematic viscosity  Dynamic viscosity divided by density, measured in centistokes (cSt); what a flow cup effectively reports.  Shear rate  The rate at which a fluid is…

Abrasion testing is a method used to evaluate how resistant a paint, coating, or surface finish is to wear caused by friction, rubbing, or repeated mechanical contact. It measures the ability of a coating to maintain its appearance, adhesion, and protective function when subjected to physical abrasion. Abrasion resistance is a critical quality parameter in…

Key Terms Abrasion Resistance  The ability of a coating or surface to resist wear caused by mechanical friction or rubbing. Measured by mass loss, film thickness reduction, or appearance change after a defined test cycle.  Taber Abraser  A rotating-platform instrument used in abrasion testing (ASTM D4060). Two abrasive wheels are applied to a coated panel under load. Results are…

Overview Abrasion testing evaluates the durability of a paint or coating when subjected to repeated mechanical friction. It is one of the most widely used methods for assessing coating quality because it directly simulates the wear a surface will experience in service - whether that is a wall being scrubbed clean, an automotive panel exposed…

A reference glossary of core terms used in washability and scrub abrasion testing of paints, coatings, and surface finishes. Structured for use across laboratory, quality control, and product development contexts.  Washability The property of a dried coating or paint film that allows it to be cleaned repeatedly with water, detergent, or abrasive media without significant…

Overview of washability testing Washability testing evaluates how well a paint, coating, varnish, or ink withstands the mechanical stress of cleaning. It is one of the most widely specified durability tests in the coatings industry, informing product development decisions, quality control processes, and regulatory compliance across architectural paints, industrial coatings, and printed packaging.  Understanding washability…

Washability testing is a standardized quality assurance method used to evaluate the resistance of paints, coatings, varnishes, and surface finishes to degradation caused by repeated cleaning or scrubbing. It measures how well a coated surface maintains its integrity, color, and appearance when subjected to wet or dry abrasion over a controlled number of strokes or cycles.  Definition…