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CASEA Sudanit 280 Alpha Hemihydrate Binder is a specially formulated rapid-set calcium sulfate binder suitable for the production of top quality self-levelling (flowing) floor screeds, simply by blending with suitable sand and water on site. CASEA Sudanit 280 Binder complies with BS EN 13454-1and is CE marked.


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


CASEA Sudanit 280 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.

Related literature

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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): > 25 N/mm², > 30 N/mm², > 40 N/mm².
  • Flexural strength (28 days): > 4 N/mm², > 6 N/mm², > 7 N/mm².
  • Tensile adhesion: > 1.5 N/mm².
  • Thermal conductivity: 1.6 W/mK.
  • Shrinkage (28 days): < 0.1%.
  • Hardening time (before foot traffic): 8 – 12 hours depending on site conditions.
  • Recommend water content: 14–16%.
  • Reaction to fire: A1 non-combustible.

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 Binder



Manufacturer details

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