Mapei Kerabond T – Cementitious Adhesive
Mapei Kerabond T – Cementitious Adhesive with no vertical slip for ceramic tiles. Kerabond T is a grey or white powder composed of cement, fine-grade, synthetic resins and special admixtures formulated in the Mapei Research and Development Laboratories. Mixed with water, Kerabond T becomes an easily trowellable mortar with good bonding strength, low slump and high grab so that it can be applied vertically without sagging, even holding heavy tiles. It is possible to install from the top towards the bottom without using spacer pegs. Kerabond T hardens without noticeable shrinkage to become extremely resistant, adhering perfectly to all the conventional materials used in construction.
The substrates must be cured, mechanically strong, free from loose particles, grease, oils, paint, wax and sufficiently dry. Cement substrates must not be subject to shrinkage after the installation of the tiles. During spring and summer, renders must be cured for at least one week for every centimetre of thickness and cement screeds must be cured for at least 28 days, unless they have been made with MAPEI special binders for screeds such as Mapecem, Mapecem Pronto, Topcem or with Topcem Pronto. Dampen with water to cool surfaces which have been heated by exposure to sunlight. Gypsum substrates and anhydrite screeds must be perfectly dry, sufficiently hard and free from dust. It is absolutely essential that the surface is abraded and then treated with Primer G or Eco Prim T. In general, refer to the relative MAPEI technical documentation regarding substrate preparation before repairing cracks in substrates, consolidating rapid-drying screeds and levelling off installation surfaces.
Kerabond T must be mixed with clean water to obtain an homogenous lump free paste; after 5-10 minutes resting, it must be re-mixed. The paste is then ready for use. The quantity of water to be used is approx. 24-26% parts per 100 parts (by weight) of Kerabond T (equal to approx. 4.8-5.2 litres of water for 20 kg of powder). Always refer to the quantity of mixing water prescribed on the packaging. The mix, produced in this way, is workable for at least 8 hours.
Kerabond T is applied with a notched trowel onto the substrate. Choose a trowel that will give a coverage to the back of the tiles of at least 65-70% for walls or for indoor light foot traffic. For heavy traffic, total immersion and for outdoor application, the coverage must be 100%. To obtain good adhesion to the substrate the following system is recommended: first apply a thin coat of Kerabond T using the smooth side of the trowel and immediately after apply the desired thickness of Kerabond T using the toothed side of the trowel.
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