POLYBIT Polybond SBR
SBR based bonding agent and admixture

Bonding slurry
Saturate absorbent surfaces with water completely till it reaches a saturate surface dry condition. However, ensure that the surface is free of standing water. Prepare a bonding slurry by mixing 2 parts O.P. cement to 1 part of Polybond SBR (by volume). Using a stiff brush, work the bonding slurry well into the damp surface, ensuring that no pinholes are visible. Do not apply bonding slurry at a thickness in excess of 2mm. If a second coat is necessary, it must be applied at right angles to the first to ensure complete coverage.
SBR modified mixes Sand:
Sand should be washed and well graded Cement: Polybond SBR is compatible with all types of opc, SRC and high alumina cements. Water: The strong plasticizing action of Polybond SBR greatly reduces the water cement ratio for any given workability. Polybond SBR: Minimum dosage of 10L per 50kg of cement is recommended to be used. For more demanding situations 15L per 50 kg of cement is recommended. Mixing should be carried out in an efficient concrete mixer - where available a pan type mixer is recommended. Pour the required quantity of sand and cement and premix for approximately one minute. Pour the required quantity of Polybond SBR and mix for two minutes. Add the water slowly until the required consistency is achieved. Avoid adding excessive water which will result in segregation and bleeding.
Render to vertical surfaces
Apply the bonding slurry to the prepared surface and then render immediately with Polybond SBR modified mortar. Apply in coats to a maximum thickness of 5mm per coat. Several coats can be applied at intervals of 20-30 minutes. Thicker coating can be applied when suitable form work is used. Finish the surface using wooden float or steel trowel.
Screeds and toppings
Screeds based on Polybond SBR modified mix should be placed over the wet bonding slurry, well compacted and struck off to level. It may be trowelled to the required finish using a steel trowel.