SBR Bonding Additive
An aqueous dispersion of Styrene Butadiene Copolymer giving a high performance water resistant SBR bonding agent and admixture for adding to sand / cement renders, cementitious flooring screeds and repair compounds.
It can be used externally and internally in areas of intermittent or continuous water contact. It is especially suitable for renders and floors with high abrasion resistance and for patching and bonding onto substrates of low suction.
Using SBR Bonding Additive
All surfaces should be sound, free from oil, grease and surface water. Before the application of a bonding slurry, surfaces of high suction should be thoroughly dampened. Preparation of the surface can be achieved by the use of mechanical scrabbling or grit blasting to give a clean fresh exposed surface.
Method of use as a Bonding Agent
An SBR bonding slurry is recommended to improve the adhesion of cement based mixes onto surfaces of low suction, and also as a treatment prior to applying any SBR modified mix. To produce the bonding slurry dilute SBR Bonding Additive with an equal volume of water then mix to a smooth creamy consistency with ordinary Portland Cement. The approximate mix is 1 part SBR: 1 part water: 5 parts cement (by volume) giving an approximate coverage of 30m² per 5 litres of SBR per coat. Following preparation of the substrate as detailed above the bonding slurry should be brushed vigorously into the surface giving an approximate 1mm thickness. Subsequent coatings must be applied while the bonding slurry is still wet. Should the slurry dry then a further coat must be applied.
To produce dense impermeable renders for use in areas where water or chemical resistance is required then the following mix is recommended.
• Cement 50 kilos
• Sand 125 kilos Clean, sharp complying with BS 1199 SBR 15 litres
• Water as required
Coverage at 12mm thickness approximately 8m²
After preparing the substrate apply a bonding slurry as described above. While the slurry is still wet, apply the rendering mix to a thickness of 6mm. Scratch the render and allow too dry for a minimum of 6 hours before applying a second 6mm coat or render. Bedding Mix The mix recommended for rendering can also be used for bonding tiles, kerb stones, coping stones, mosaics, brick slips etc. Prepare and apply the bonding slurry to both surfaces, then apply the render mix to the wall/floor and bed on the tiles etc.
The mix recommended for rendering can also be used for patching renders or concrete. Should reinforcing steel be present then that should be prepared by removing all loose rust then prime by applying one layer of bonding slurry and leaving overnight. A second layer of bonding slurry should then be applied to the steel and the prepared area of concrete to be patched and the rendering mix applied while the bonding slurry is still wet.
Where dampness is expected from behind the plaster (basements and cellars) then three layers of bonding slurry should be applied. Brush the first coat of bonding slurry into the substrate then allow to become touch dry. Apply a second coat of bonding slurry at right angles to the first, stippled to provide a key, then leave to dry for at least 48 hours. Apply a third layer of bonding slurry and trowel the render coat into this while it is still wet. The plaster to be used should be the render mix described overleaf. This system is suitable for new work or where the substrate is sound ie. engineering brick or concrete.
To produce high quality, hard wearing floors the following mix is recommended:
•Cement 50 kilos
•Sharp Flooring Sand 75 kilos
•3mm Granite Chips 75 kilos
•SBR 10 litres
•Water as required
Coverage at 12mm thickness approximately 8m²
Prepare the base thoroughly and apply a bonding slurry. The materials should be mixed to a semi-dry consistency and applied into a wet bonding slurry at a thickness of 25mm. For floor toppings above 25mm reduce the SBR to 5 litres and add extra water to produce a semi-dry mix.
- Improves adhesion and bonding
- Suitable for use in damp conditions
- Improves workability, strength and abrasion resistance
- Reduces shrinkage and cracking and improves flexibility
- Improves chemical and water resistance
- Allows reduction in water content
- 48% Solids content (Professional grade)
Model: SBR25 SKU SBR25 Manufacturer: Permagard Packaging: individually Size: 25 Litre Dilution: as per data sheet Coverage: as per data sheet
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