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Südanit 280 Alpha Hemihydrate Screed is a pumpable, high-quality screed material based on calcium sulfate. It is supplied using a pre-blended compound and is mixed on site with a special blend of approved aggregates to EN 13813: 2002. It is designed for application at thicknesses of 20–90 mm. Südanit 280 Alpha Hemi Hydrate Binder complies with EN 13454-1: 2004 and is CE marked.


  • Smooth laitance free finish.
  • Pumpable.
  • Underfloor heating – full encapsulation.
  • Suitable for underlayment in wet areas.
  • Reduced drying times.
  • CE marked.
  • BS EN 13454-1/ EN 13813: 2002.


CASEA Sudanit 280 Alpha Hemihydrate Screed is suitable for floors in homes, offices, public buildings and places exposed to similar loads. It may be applied as a levelling screed directly onto a load bearing floor, unbonded on a separating barrier (polythene) or as a floating floor and is particularly suited in conjunction with underfloor heating or cavity floors. It should be covered with a floor finish such as tiles, linoleum, parquet, cork or carpet. If a cement based adhesive or smoothing compound is required, the surface of the screed must first be sealed, using an appropriate acrylic primer/ sealer.

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Standard product features

Technical characteristics (to EN 13813: 2002):

  • Maximum thickness: 90 mm.
  • Minimum thickness: Bonded, 20 mm. Unbonded, 30 mm. Domestic, 35 mm. Commercial, 40 mm. Over underfloor heating pipes: 25 mm (BS 8204-7).
  • Use: Internal.
  • Compressive strength (28 days): >20 N/mm², >25 N/mm², >30 N/mm², >40 N/mm²
  • Flexural strength (28 days): > 4 N/mm², > 5 N/mm², > 6 N/mm², > 7 N/mm²
  • Tensile adhesion: > 1.5 N/mm².
  • Shrinkage (28 days): < 0.1%.
  • Hardening time (before foot traffic): 8–12 hours.
  • Recommend water content: 14–16%.
  • Reaction to fire: A1 non-combustible.
  • Thermal conductivity: 1.6 W/mK.
  • Wet Density: Ca. 2,088 kg/m3 (2.1 kg/mm/m2).

NBS Specification

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This product is associated with the following NBS Create clause:
45-55-10/325 Self-smoothing calcium sulfate screeds (ready mixed)

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



SMET Building Products Ltd


+44 (0)28 30266833

Product reference

CASEA Sudanit 280 Floor Screed

Manufacturer details

93A Belfast Road,
Co Down, BT34 1QH
Tel +44 (0)28 30266833
Fax +44 (0)28 30267619
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