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.
Benefits of Südanit 230 Alpha Hemihydrate Binder
• Smooth Laitance Free Finish
• 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|
|Minimum Thickness||Bonded: 20mm
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.