CASEA Südanit 280 Alpha Hemihydrate Binder

Südanit 280 Alpha Hemihydrate Binder is a specially formulated calcium sulphate binder suitable for the production of top quality self-levelling (flowing) floor screeds, simply by blending with a suitable sand and water on site.

Südanit 280 Alpha Hemihydrate Binder complies with EN 13454-1: 2004 and is CE marked. Südanit 280 Alpha Hemihydrate Screed is suitable for floors in homes, offices, public buildings and places exposed to similar loads. Südanit 280 Alpha Hemihydrate Screed 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. Südanit 280 Alpha Hemihydrate Screed 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.

Sand should be of an approved quality and grading. Trials should always be carried out to optimise the mix design before work commences. The proportion of binder required is 475 – 600kg/m³. Sufficient sand is required to produce 1m³ of screed, with sufficient water added to produce a flow spread diameter of 230-260mm. A typical starting point mix design is 600kg Binder, 1200kg sand (dry weight) and 330L water per m³. All materials should be adequately mixed to ensure full dispersion of materials without lumps.

Related Downloads

icon-pdf  TDS CASEA Sudanit 280 Binder

icon-pdf  TDS SMET_Tiling Onto Calcium Sulphate Floor Screed_System I

icon-pdf  TDS SMET_Tiling Onto Calcium Sulphate Floor Screed_System II

icon-pdf  SMET Floor Screeds and Compounds Product Selector

icon-pdf  EPD – CASEA Calcium Sulphate Flowing Screed

National Building Specification Clause

Benefits of Sudanit 280 Alpha Hemihydrate Binder

• Smooth Laitance Free Finish
• Pumpable
• Under Floor Heating – Full Encapsulation
• UFH can be commissioned and running during screed application at max. water temp (manifold) of 25 ˚C
• Suitable For Underlayment In Wet Areas
• Reduced Drying Times
• CE Marked
• EN 13454-1: 2004
• 25kg bags and bulk

Technical Details for Südanit 280 Alpha Hemihydrate Binder

Screed Specification EN 13813: 2002
Maximum Thickness90mm
Minimum ThicknessBonded: 20mm Unbonded: 30mm Domestic: 35mm Commercial: 40mm

Over Underfloor heating Pipes: 25mm (BS 8204-7)

Use (External Use)No
Use (Internal Use)Yes
Compressive Strength (28 days)>25 N/mm²

>30 N/mm²

>40 N/mm²

Flexural Strength (28 days)> 5 N/mm²

> 6 N/mm²

> 7 N/mm²

Bulk Densityapprox. 1.3 kg/dm³
Flow Rate230 – 260mm (slump flow – Hägermann cone)
Light foot-trafficapprox. 8 hours depending on drying conditions
Partial load-bearing capacityapprox. 36 h / 1.5 days dependent on thickness and drying conditions
Pot life30 – 45 minutes depending on ambient conditions
Reaction To FireA1 Non-Combustible
Packagingbags and bulk
Underfloor Heating CommissioningUFH can be commissioned and running during floor screed application at max. water temperature (manifold) of 25˚C

Available in 25kg bags and bulk

Watch Ireland’s leading floor screed applicator, one of our busiest Smet Supported Partners, install their flowing screed, made using Südanit 280 Alpha Hemihydrate Binder, applied with their state-of-the-art mobile screed factory – click this video:

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