CASEA Südanit 230 Alpha Hemihydrate Binder

Südanit 230 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 230 Alpha Hemihydrate Binder complies with EN 13454-1: 2004 and is CE marked. Südanit 230 Alpha Hemihydrate Screed is suitable for floors in homes, offices, public buildings and places exposed to similar loads. Südanit 230 Alpha Hemihydrate Screed may be applied as a levelling screed directly onto a load bearing floor, unbonded on a separating barrier (polytheen), as a floating floor and is particularly suited in conjunction with underfloor heating or cavity floors. Südanit 230 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 220-260mm. 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 230 Binder

icon-pdf SMET Floor Screeds and Compounds Product Selector

icon-pdf TDS SMET_Tiling Onto Calcium Sulphate Floor Screed_System I

icon-pdf TDS SMET_Tiling Onto Calcium Sulphate Floor Screed_System II

NBSplus National Building Specification Clause

BIM Building Information Modelling Object

Benefits of Südanit 230 Alpha Hemihydrate Binder

• Smooth Laitance Free Finish
• Pumpable
• Under Floor Heating – Full Encapsulation
• Suitable For Underlayment In Wet Areas
• Reduced Drying Times
• CE Marked
• EN 13454-1: 2004

Technical Details for Südanit 230 Alpha Hemihydrate Binder

Screed Specification EN 13813: 2002
Maximum Thickness 90mm
Minimum Thickness Bonded: 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 Density approx. 1.2 kg/dm3
Flow Rate 220 – 240mm (slump flow – Hägermann cone)
Light foot traffic approx. 12 hours depending on drying conditions
Partial load-bearing capacity approx. 48 hours / 2 days depending on thickness and drying conditions
Hardening Time (before foot traffic) approx 12 hours
Pot life (open time as mortar) 30 – 45 minutes depending on ambient conditions
Reaction To Fire A1 Non-Combustible
Packaging 25 kg bags and bulk
Underfloor Heating Commissioning after 4 days

Packaging: Available in 25kg bags, big bags, & bulk bags.