pulverförmige

Pulverförmige is a German adjective meaning powdery or in powder form. In scientific and technical usage it describes a substance that exists as fine, discrete solid particles with a large surface area relative to its volume. Materials described as pulverförmig can range in particle size from sub-micron to hundreds of micrometers and are typically produced by grinding, milling, atomization, or crystallization.

Common fields where pulverförmige substances occur include chemistry, materials science, pharmaceuticals, cosmetics, food, and metallurgy. These materials are integral to powder metallurgy and additive manufacturing, as well as to pigments, coatings, catalysts, and various dosage forms. The powder state enables processes like compression, sintering, spraying, and coating.

Key properties and analysis of pulverförmige materials include particle size distribution, bulk density, flowability, and cohesiveness. Parameters such as the Hausner ratio, Carr index, and angle of repose are used to assess handling behavior. Other important factors are moisture content and hygroscopicity, which influence clumping, stability, and storage.

Handling and safety considerations are important due to the generation of airborne dust. Fine powders can pose inhalation hazards and, in some cases, explosion risks when dispersed in air. Protective measures include adequate ventilation, dust controls, appropriate personal protective equipment, and adherence to relevant safety regulations.

Examples of pulverförmige substances include talc, flour, powdered sugar, graphite powder, and metal powders such as aluminum or titanium. The term emphasizes the material’s physical state rather than a processing method; it is distinct from pulverisiert, which refers to turning material into powder.