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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…

How to validate protective coatings with adhesion and corrosion testing Protective coatings only deliver value if they stay bonded to the substrate and resist the environments they're exposed to. Whether you're coating bridge steel, automotive body panels, marine structures, or industrial components, two families of test give you the evidence you need: adhesion testing and…

Key terms Adhesion: The strength of the bond between a coating and its substrate.  Substrate: The surface a coating is applied to, such as metal, concrete, wood, or plastic.  Pull-off adhesion test: A quantitative test that measures the perpendicular force needed to detach a coating from its substrate, reported in MPa or psi.  Dolly: The…

Coating adhesion and corrosion testing are two complementary coating test and measurement methods used to confirm that a protective coating will perform once a product is in service. Together they answer two questions that matter to quality, R&D, and operations experts: will the coating stay attached to the substrate, and will it protect that substrate…

What is clay and mineral pigment testing for paper and board? Clay and mineral pigment testing measures the brightness and color of the mineral pigments used as fillers and coating pigments in paper and board, such as kaolin clay, calcium carbonate, talc, and titanium dioxide. Because the optical properties of these pigments directly affect the brightness, whiteness,…

Mineral pigments, including kaolin clay, calcium carbonate, talc, and titanium dioxide, are used as fillers and coating pigments throughout paper and board production. They influence the brightness, whiteness, opacity, and color of the finished sheet. For quality and R&D experts, measuring the optical properties of these pigments is an important quality control step. But mineral…

Clay and mineral pigment testing Key terms Mineral pigment (filler): A finely ground mineral added to paper and board to improve optical properties, printability, and to manage cost. Common examples include kaolin clay, calcium carbonate, talc, and titanium dioxide.  Brightness: The reflectance of a sample measured under defined conditions. For mineral pigments it is reported on the…