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Ardex X77 Tile Adhesive C2TE S1 20Kg – Pallet Deals and Bulk Buy – MICROTEC fibre reinforced, cement-based, floor and wall tile adhesive


Ardex X77 Tile Adhesive

MICROTEC Flexible Wall and Floor Tile Adhesive

ARDEX X 77 MICROTEC® Flexible Standard Set Tile Adhesive has been specifically engineered to fit today’s tiles with ease, whilst also providing additional performance benefits that support modern fixing practices.

  • Fix any tile size or type without slipping and without the need for battens, with advance slip resistance that achieves double the European Standard
  • Spend less time mixing and more time fixing, with a 3-hour pot life and 60 minute open time that allow you to mix, spread and fix in larger batches
  • Get up to 8m2 from every bag, with a high yield formulation that goes up to 40% further than leading competitors*
  • 10kg bag comes inside FREE mixing bucket
  • Ideal for almost all tile types including non-moisture sensitive natural stone
  • Suitable for wall and floor applications
  • Suitable for internal and external areas, including swimming pools
  • Suitable for use with underfloor heating

Colours Available: Grey & White

Unit Size Available: 20kg


ARDEX X 77 and ARDEX X 77 W contain a reducing agent to control the level of Chromium VI when mixed prior to use. ARDEX X 77 and ARDEX X 77 W must be stored in unopened packaging, clear of the ground in cool dry conditions and protected from excessive draught.

If stored correctly, as detailed above, and used within 12 months of the date shown on the packaging, the activity of the reducing agent (added to control the level of soluble Chromium VI) will be maintained and this product will contain, when mixed with water, no more than 0.0002% (2ppm) soluble Chromium VI of the total dry weight of the cement content of this product. ARDEX X 77 and ARDEX X 77 W must not be used after the end of the declared storage period.

Ardex X77 Tile Adhesive extended information

Coverage: A 20kg bag of ARDEX X 77 or ARDEX X 77 W will yield approximately 19 litres of mortar, using approximately 1.05kg 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, notched trowel and technique used to bed the tiles e.g. a 20kg bag of ARDEX X 77 or ARDEX X 77 W will cover up to 8m2 when using an 8mm x 8mm square toothed and notched trowel.

  • MICROTEC fibre reinforced
  • Achieves an open time of up to 60 minutes, double that of ‘E’ classified adhesives
  • 3 hour pot life
  • Advanced slump resistance, double that of ‘T’ classified adhesives, ideal for fixing large format wall tiles
  • High yield – up to 8m2 using an 8mm x 8mm trowel
  • Ideal for all tile types, including porcelain, fully vitrified, mosaics and terrazzo
  • Ideal for swimming pools and wet areas
  • Suitable for underfloor heating
  • For internal and external applications

ARDEX X 77 and ARDEX X 77 W are grey or white, MICROTEC fibre reinforced, cement-based, floor and wall tile adhesives, with an extended open time of up to 60 minutes. Specifically formulated to have enhanced properties of adhesion and flexibility, the advanced slump resistance properties make ARDEX X 77 and ARDEX X 77 W ideal for fixing large format wall tiles.

Ardex X77 Use

ARDEX X 77 is ideal for fixing ceramic or fully vitrified tiles and other tiles with low porosity, as well as glass and porcelain mosaics, and terrazzo. The BS EN 12004 C2 TE S1 designation for ARDEX X 77 and ARDEX X 77 W classifies the adhesives as an “improved cementitious adhesives with additional characteristics, reduced slip and extended open time”. ARDEX X 77 and ARDEX X 77 W have an extended open time of up to 60 minutes, twice the requirement of BS 12004, and double the slump resistance of ‘T’ classified adhesives. The additional characteristics for ARDEX X 77 and ARDEX X 77 W, determined in accordance with BS EN 12004, makes these products ideal for fixing all types of ceramic tiles and mosaics, in internal and external situations, including swimming pools.

The mixed mortar has a slump free consistency with very high initial grab enabling heavy wall tiles to be fixed, thus reducing the need for battens and spacers. ARDEX X 77 and ARDEX X 77 W adhere strongly to most construction materials such as concrete, cement and sand renders and screeds, heated sub-floors, brickwork and blockwork, gypsum plaster, plasterboard and primed existing ceramic tiled surfaces.

Ardex X77 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 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 X 77 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 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.

Ardex X77 Mixing

ARDEX X 77 and ARDEX X 77 W 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: 2 parts ARDEX X77 or ARDEX X77W powder to 1part water. A 20kg bag of ARDEX X 77 or ARDEX X 77 W requires approximately 8.5 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 mortar should be applied at temperatures above 5°C.

The pot life of the mixed mortar is approximately 3 hours at 20°C.

Ardex X77 Application

The mixed adhesive 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 with at least 50% of the back of the tile. For maximum performance at least 80% adhesive contact of the back of the tile should be achieved.

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 X 77 and ARDEX X 77 W are classified as having an extended open time of up to 60 minutes with freshly mixed material, when used in accordance with BS EN 12004. For optimum performance under typical UK site conditions tiles should be fixed within 40 minutes and tiles can be adjusted for up to 30 minutes at 20°C.


Grouting can proceed once the tile bed has hardened sufficiently so that the tiles will not be dislodged. When grouting wall tiles, ARDEX X 77 and ARDEX X 77 W are normally hard enough after 8 hours at 20°C, depending on the porosity of the tile and the background. When grouting floor tiles ARDEX X 77 and ARDEX X 77 W are normally hard enough after 24 hours 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 ARDEX EG 8 Cement/ Epoxy Hybrid Grout for areas where chemical resistance and hygienic joints are required, i.e. commercial food preparation areas.



Concentrated Water-Based Primer and Bonding Agent for use on absorbent backgrounds, plaster and anhydrite/ calcium sulphate screeds prior to the use of ARDEX X 77 or ARDEX X 77 W. Dilute ARDEX P 51 1:3 with water.


Ready Mixed, Multipurpose, Rapid Drying Primer for use on ceramic and porcelain tiles, concrete and terrazzo. ARDEX P 4 Primer is solvent free, and dries after 60 minutes. It is suitable for use in dry, damp or wet (not submerged) internal and external locations.


Non-Flammable, Water-Based Synthetic Primer for use on smooth impervious surfaces including existing ceramic tiling, internal asphalt, terrazzo, timber walls, sound and well adhered paint coatings and old adhesive residues, prior to the use of ARDEX X 77 or ARDEX X 77 W.



Allow at least 6 weeks, preferably at least 12 weeks, drying time prior to fixing tiles onto new concrete. Mechanically clean concrete and ensure mould oil and curing agents are removed.

Cement/sand render and screed

Wood float finish and prevent rapid drying of the surface for 3 days (renders) or 7 days (screeds). Allow render to air dry in good conditions for at least 2 weeks prior to tiling or at least 3 weeks for screeds prior to tiling.

Note for Screeds:

With an ARDEX A 38 cement/sand screed, tiles can be fixed after only 4 hours.
Note for Renders:
With ARDEX AM 100 Rapid Hardening One Coat Tile Render tiles can be fixed only 2 hours after application.

Gypsum Plaster

Do not use in wet or damp conditions. Gypsum plaster must be dry and at least 4 weeks old prior to tiling. Wire brush plaster to remove dust. Use ARDEX P 51 primer. Tile weight should not exceed 20kg /m2.


Ensure boards are rigidly braced and adequately supported. Fix directly to the paper facing. Do not skim with plaster. Tile weight should not exceed 32kg /m2.

Wood-based sheets and boards

Prior to tiling, ensure that new or existing boards are dry i.e. conditioned to the environment in which they will be used, and are rigidly fixed, ventilated and free from barriers to adhesion. For timber floors ARDEX recommend the use of ARDEX X 7001 adhesive and ARDEX P 51 Primer.

When using ARDEX X 77 or ARDEX X 77 W on plywood walls, the plywood needs to be primed with ARDEX P 82 Primer. NOTE: BS 5385 advises that wood based sheets and boards should be avoided if at all possible as a background for tiling. If such boards, e.g. plywood board, chipboard, etc. have to be used, they should be restricted to small areas and installed in such a way that they provide a dimensionally stable and rigid background. The backs and edges of such boards should be treated against the ingress of atmospheric moisture that would result in movement and warping.

Tiles should not bridge joints between boards. Since plywood and other wood based boards are not dimensionally stable, they should not be used in wet or damp conditions where they will be subjected to changes in atmospheric humidity. Ceramic tiles should not be used on timber based boards in wet areas or external locations.

Painted surfaces

A trial area should be carried out by priming the sound paint coating with ARDEX P 82 primer prior to fixing the tiles in ARDEX X 77 or ARDEX X 77 W.

Calcium Sulfate-based screeds i.e. Anhydrite

Ensure they have been laid and prepared in accordance with the manufacturers recommendations. Generally they require sanding and must have a moisture content of 0.5% or less measured using the carbide method. Prime with ARDEX P 51, diluted with 3 parts of water.

Existing glazed ceramic tiling

Ensure existing tiling is well adhered and can support the new tile bed. Thorough cleaning and rinsing off is essential. Prime tiles with ARDEX P 82 (Internal dry areas only), or ARDEX P 4 (external locations).

Asphalt sanded

With well adhered sand key no primer is required. Internal areas only. If sand key is poor or worn off, proceed as for smooth asphalt.

Asphalt smooth

Priming with ARDEX P 82 recommended. Internal dry areas.

Underfloor heating

ARDEX X 77 and ARDEX X 77 W are suitable for fixing ceramic tiles to concrete or cement and sand screeds with underfloor heating.


ARDEX X 77 and ARDEX X 77 W are is packed in paper sacks incorporating a polyethylene liner – net weight 20kg.

Ardex X77 Technical Summary

Weight of fresh mortarapproximately1.5kg/litre
Working time (20°C):approximately3 hours
Fixing time (20°C):up to60 minutes
Adjusting time (20°C):approximately30 minutes
Open Time:approximately60 minutes
Slip Resistance:Slip - less than0.5mm
Tensile Adhesion Strength:Greater than1 N/mm2 under all test conditions.
Transverse Deformation:Classification S1 (Deformation greater than or
equal to 2.5mm and less than 5mm)
View other products by Ardex here.


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