sádrou

Sádrou is the Czech instrumental singular form of the noun sádra, which most commonly denotes plaster or gypsum. In linguistic use, sádrou means “with plaster” and appears in phrases describing actions or states involving plaster, for example when casting, coating or repairing surfaces.

As a material, sádra (gypsum) is a soft sulfate mineral (calcium sulfate dihydrate, CaSO4·2H2O) that, when heated, yields plaster of Paris (calcium sulfate hemihydrate). Plaster is used in construction for walls and ceilings, in medicine for immobilizing fractured limbs as a plaster cast, and in arts for molds, sculpture and decorative work. Its setting reaction on rehydration produces a hard, porous mass useful for shaping and finishing.

Practical properties of plaster include good workability, fire resistance, and moderate thermal mass. Limitations include brittleness, sensitivity to prolonged moisture, and dust generation during cutting or sanding. Modern alternatives or complements include gypsum board, polymer-based casts, and fiberglass bandages in medical applications.

Environmental and safety considerations focus on dust control, proper disposal, and limiting contact with wet plaster to avoid skin irritation. Gypsum production and recycling practices vary regionally; reclaimed gypsum may be reused in construction or agricultural amendments under controlled conditions.

In Czech grammar and everyday speech, sádrou functions as a case form to indicate accompaniment, means, or instrumentality involving plaster.