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Anhydrite flour

Description

Anhydrite flour is a white or light gray powder without lumps and impurities, obtained by fine grinding of natural anhydrite. Its main component is anhydrous calcium sulfate (CaSO₄).

Depending on the field of application, the material performs two different functions. When mixed with water, it acts as an active mineral binder: it hydrates, hardens and gains strength, while exhibiting virtually zero shrinkage. When incorporated into polymer compounds, bitumen or glass batches, it serves as an inert filler that improves technological and performance characteristics without chemically interacting with the medium.

Advantages

  • Virtually zero shrinkage during hardening — a key advantage over cement, allowing solid areas of up to 300–1000 m² to be poured without a single expansion joint.
  • High final strength and hardness — anhydrite-based binder forms a durable stone resistant to loads and abrasion.
  • Dual functionality — works as a binder in screeds and shotcrete, and as an inert filler in PVC, bituminous compounds and adhesives.
  • High purity and uniformity — the absence of lumps and impurities guarantees consistent quality in any formulation.

Applications

As a binder:

  • Self-leveling floor screeds in construction.
  • Shotcrete and construction of fire dams in the mining industry.

As an inert filler:

  • Production of PVC tiles and floor coverings.
  • Manufacture of bituminous compounds and adhesives.
  • Production of economical glass.

FAQ

Both — depending on the field of application. When mixed with water, finely ground anhydrite hardens as a mineral binder. In dry polymer and bituminous compounds, it acts as an inert filler.

The main reason is its virtually zero shrinkage. This allows very large areas to be poured without expansion joints, which is impossible for cement-based screeds. Plasticizers are added to the mix to reduce water demand and ensure workability without loss of strength.

Unlike inert fillers, anhydrite on contact with moisture initiates a hydration reaction right in the bag — it converts to gypsum and irreversibly loses its binding properties. Therefore, a dry, enclosed storage area is a strict requirement.

It is used in the production of PVC tiles and floor coverings, economical glass, bituminous compounds and adhesives, and in the mining industry for shotcreting and construction of fire dams.