verdunners

Verdunners are liquids used to thin or dilute paints, varnishes, and other coatings, enabling easier application and control of viscosity. The term is most common in Dutch and some European contexts, where verdunner or verdunners denote thinning agents. In general English usage, the broader terms thinner or solvent are used.

Composition and common examples: Verdunners are typically hydrocarbon or oxygenated solvents. Commonly used include mineral spirits (white spirit), turpentine or gum turpentine, mineral turpentine, xylene, toluene, acetone, n-butyl acetate, and naphtha. The exact choice depends on the binder, required evaporation rate, compatibility with pigments, and whether water is involved. Some systems use water-based thinners, but those are usually not called verdunners in traditional parlance.

Applications: In manufacturing and finishing, verdunners adjust viscosity for brushing, rolling, or spraying; they also help clean equipment and thin varnishes, lacquers, and epoxy coatings to the desired spray viscosity. They are used in automotive refinishing, wood finishing, and industrial coatings.

Safety and environmental considerations: Verdunners are typically highly flammable and emit volatile organic compounds (VOCs). Prolonged or repeated exposure can affect health; use in well-ventilated areas, with appropriate PPE, such as gloves and eye protection. Regulations may limit VOC content and mandate proper storage, handling, and disposal.

See also: Solvents, thinning agents.