Description
ARDEX X77S is a grey MICROTEC fibre reinforced, ultra rapid setting and hardening, cement-based, floor and wall tile adhesive. Specifically formulated to have enhanced properties of adhesion and flexibility, the advanced slump resistance properties make ARDEX X77S ideal for fixing large format wall tiles.
ARDEX X77S is ideal for fixing ceramic or fully vitrified tiles and other tiles with low porosity, as well as glass and porcelain mosaics, and terrazzo. ARDEX X77S will adhere strongly to most construction materials including concrete, cement and sand renders and screeds, heated sub-floors, brickwork and blockwork, gypsum plaster, plasterboard and existing ceramic tiled surfaces. The BS EN 12004 C2 FTE S1 designation for ARDEX X77S classifies the adhesive as ‘Improved fast setting deformable cementitious adhesive with reduced slip and extended open.’ The enhanced setting and hardening performance of ARDEX X77S means that after only 24 hours, the adhesive can withstand full loads.
Surface Preparation:
The backgrounds and surfaces to receive the tiles must be clean, firm, free of dust, dirt, oil, grease and other barriers to adhesion, as well as being strong enough to support the weight of the tiles being fixed. Ensure that the background has adequate drying time, as given in the relevant part of BS 5385, and is correctly primed, where required, prior to fixing the tiles. Install tiles in accordance with the relevant parts of BS 5385 and BS 8000 : Part 11 Workmanship on Building Sites. Backgrounds to receive ceramic tiles should be finished to Surface Regularity 1 i.e. so any gap under a 2m straight edge does not exceed 3mm. ARDEX X77S can be applied to dry or moist surfaces, but moisture sensitive materials must be dry and remain dry after fixing. ARDEX WPC Waterproof Protection System can be used in showers prior to tiling to create a waterproof protective coating that guarantees the prevention of water damage to floors and walls, by protecting moisture sensitive backgrounds in wet locations.
Mixing:
ARDEX X77S powder is added to clean water in a clean container whilst stirring, and mixed thoroughly to give a slump free, easily worked mortar. The use of an ARDEX mixing paddle with a 10mm chuck, variable speed electric drill makes light work of mixing. The mix proportions by volume are approximately: 2¾ parts ARDEX X77S powder to 1 part water. A 20kg bag of ARDEX X77S requires approximately 6.8 litres of water.
DO NOT EXCEED the maximum water content. The consistency of the adhesive can be adjusted to suit site conditions and the materials being fixed. The mixed adhesive should be applied at temperatures above 5°C. The pot life of the mixed mortar is approximately 30 minutes at 20°C.
Application:
The mixed mortar is applied to the prepared surface with a trowel and then combed through with a suitably sized notched trowel in straight ribs to give a ribbed mortar bed. The tiles should be fixed within the open time of the applied adhesive and pressed into place with a twisting and sliding action to achieve the required contact. For tiling to walls in dry internal locations the adhesive contact should be such that maximum practical contact between the tile and the adhesive is achieved. Tiles with a surface area of less than 0.1 m², but which weigh more per square metre than 70% of the background’s capacity to carry the weight, should be solidly bedded. Tiles with a surface area of 0.1 m² or greater, should be solidly bedded. When tiling to floors, wet areas such as showers and swimming pools, or in external locations achieving a solid bed usually requires the back of the tiles to be buttered immediately prior to placing into the ribbed bed so no voids are left beneath the tiles. The size of notched trowel chosen depends on the tile size, the surface being tiled, the profile on the back of the tile and the degree of coverage required. ARDEX X77S is classified as having an open time of up to 20 minutes with freshly mixed material, when used in accordance with BS EN 12004. For optimum performance, tiles should be fixed within 20 minutes, and can be adjusted for up to 15 minutes at 20°C.
Grouting:
Grouting can proceed once the tile bed has hardened sufficiently so that the tiles will not be dislodged. When grouting wall tiles, ARDEX X77S is normally hard enough after 60 minutes at 20°C, depending on the porosity of the tile and the background. When grouting floor tiles ARDEX X77S is normally hard enough after 90 minutes at 20°C to accept foot traffic depending on the porosity of the tile and the background. Higher temperatures will shorten and lower temperatures will lengthen these times. The tile joints should be grouted with the appropriate ARDEX-FLEX Tile Grout or the appropriate ARDEX Epoxy Grout for areas where chemical resistance and hygienic joints are required, i.e. commercial food preparation areas.
Coverage:
A 20kg bag of ARDEX X77S will yield approximately 16.7 litres of mortar, using approximately 1.2kg of powder per m² per mm thickness of adhesive bed. The actual coverage achieved in practice will depend on the back profile of the tile and notched trowel and technique used to bed the tiles e.g. a 20kg bag of ARDEX X77S will cover approximately 9.5m² when using a 5mm x 5mm square toothed and notched trowel.
Technical Data:
Bulk density of powder: approximately 1.1kg/litre
Weight of fresh mortar: approximately 1.6kg/litre
Working time (20°C): approximately 30 minutes
Pot Life: 30 minutes
Fixing time (20°C): approximately 30 minutes
Adjusting time (20°C): approximately 15 minutes
Tensile Adhesion Strength: Greater than 1 N/mm2
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