ARDEX X77S - Ultra-fast drying flexible tile adhesive

Ultra-fast drying flexible tile adhesive for tile installation. Can be walked on and rejoined in only 90 min. Microtec® technology for fixing low porous materials. Waterproof and highly deformable. No efflorescence. With fibres. High performance. Floors, walls, facades. Interior and exterior. Complies with EN 12004 C2 F TT E S1.

Color ES
  • Gray
Packaging format
Tax excluded


C2TES1   EC1   ardex microtec   Marcado CE   

Flexible tile adhesive for fast setting tiles. Can be walked on and rejoined in only 90 min. Microtec® technology for fixing low-porous materials. Waterproof and highly deformable. Efflorescence-free tile adhesives. With fibres. High performance. Floors, walls, facades. Indoors and outdoors. Complies with EN 12004 C2 F TT E S1.

Field of application:

Interiors and exteriors. Walls and floors. Flexible

Laying of:

  • - ceramic tiles, stoneware and porcelain tiles
  • - glass and porcelain mosaics
  • - concrete cut stone
  • - natural stone not very sensitive to moisture

Laying of:

  • - panels suitable for construction, e.g. plasterboards
  • - rigid foam insulation boards and mineral fibre insulation boards
  • - rigid foam insulation boards with mortar coating on both sides, Wedi type

Laying of tiles in swimming pools.

Laying of ceramic tiles on facades.

Laying tiles on concrete and masonry still in the shrinkage phase (at least 3 months old).

Laying of tiles on floors with underfloor heating.

Product description:

Composite powder based on cements, special additives, MICROTEC fibres and flexible synthetic materials. When mixed with water, a smooth, creamy adhesive mortar with high stability is obtained. The application time is approximately 30 min. The mortar hardens by hydration and drying.

Preparation of the substrate:

The substrate, dry or wet, must be firm, able to bear weight, resistant, free of dust, dirt or separating elements.

Gypsum substrates, as well as porous or sanded interior floors, must be dry and a first coat of ARDEX P51 primer, diluted with water 1:3, must be applied.

Non-porous substrates made of metal, glass, varnish paints, etc. in interiors must be pre-coated with ARDEX P82 synthetic resin.

In interiors, existing ceramic substrates must be pre-treated with either a first coat of ARDEX P82 or a thin coat of ARDEX X77S. In exteriors, existing tiles should be primed with ARDEX P4 or a thin coat of ARDEX X77S for application over existing tiles.

In areas of permanent humidity and outdoors, the substrates must be treated with Ardex waterproofing products beforehand.

ARDEX X77S adhesive should be applied after the primer or waterproofing coat has dried.

Directions for use:

Pour clear water into a clean mixing bowl and mix a corresponding quantity of ARDEX X77S powder until a lump-free, elastic and stable mortar is obtained.

The mortar should be stirred again before application to the substrate.

Approximately 7.75 litres of water are required to mix 25 kg of ARDEX X77S powder.

The consistency of the mortar may vary slightly in each case, depending on the type, size and weight of the coatings to be applied.

ARDEX X77S powder is mixed with ARDEX E90, diluted with water at a mixing ratio of 1:2, to obtain a special adhesive with high deformability and water-repellent properties.

The mixing ratio is approx: 

25 Kg ARDEX X77S powder

3.0 kg of ARDEX E90

6.0 litres of water

The ARDEX X77S mortar is applied to the substrate and combed vertically with a notched trowel in such a way as to ensure adhesion of the tiles over their entire surface. The selection of the notched trowel is determined by the type, size and back of the tiles.

In the case of heavily stressed surfaces, as in flooring, it is recommended to use the double bonding system for maximum adhesion.

Rough and uneven substrates can be levelled with ARDEX X77S. Once the levelling layer has dried, tiling can be carried out.

The fixing surfaces must not be larger than the set application time of approx. 20 minutes.

Tiles can be corrected up to 15 minutes after laying.

For bonding insulation boards, the mortar is applied in strips. The surface of the tiles should be scraped mechanically if they do not have open pores.

If paper-covered glass and porcelain mosaic tiles are laid on the front side, ARDEX X77S should be applied liberally so that the product protrudes through the joints when the mosaic is pressed into the tile. In this case, subsequent grouting should also be carried out with ARDEX X77S.

In case of doubt, carry out a preliminary test.

ARDEX X77S must be used at temperatures above +5°C and below +30°C.

Higher temperatures shorten processing and installation times, lower temperatures lengthen them.


When laying tiles on building slabs, care must be taken when fixing the slabs to the internal substrate to ensure that the tile installation is strong and stable.

We recommend using ARDEX waterproofing products for waterproofing.

Products from the ARDEX natural stone system are suitable for the stain-free installation of marble and other natural stone in interiors.

In spas, saunas and public swimming pools, the use of ARDEX WA or ARDEX EG8 is recommended, both as a bonding and grouting material.

When laying tiles on floors in the shrinking phase, the field dimensions must be limited by laying expansion joints.


Contains cement. Irritating to skin. Danger of serious damage to eyes. Keep out of reach of children. Dust must not be inhaled. Avoid contact with eyes and skin. In case of contact with eyes, rinse thoroughly with water and seek medical advice. During handling wear protective gloves and goggles, as well as face protection. If swallowed, consult a doctor immediately and show the label.

When set, the product is physiologically and ecologically harmless.

GISCODE ZP1 = product with low chromate cement content. For further information see technical data sheet.

Technical data

Mixing ratio:

Approx. 7.75 litres of water per 25 kg of powder which corresponds to approx. 1 vol. of water per 3 vol. of powder.

Density: Approx. 1.1 Kg/litre.

Density of the mortar when fresh: Approx. 1.6 Kg/litre.


On smooth substrates:

Approx. 1.3 kg/m² with a 3x3x3x3 notched trowel.

Approx. 2.0 kg/m² with a 6x6x6 notched trowel.

Approx. 2.5 kg/m² with a 8x8x8 notched trowel.

Working time (20°C): Approx. 30 minutes.

Setting time (20°C): (open time): (open time)

Approx. 30 min. (measured with fresh mortar).

Setting time (20°C): Approx. 15 min.

Workability (20°C): After approx. 90 min., grouting is possible.

Grouting of walls: After approx. 60 min.

Tensile strength: 

-After 6 h. ≥ 0.5 N/mm2

-For stoneware tiles, after 28 days.

Dry and wet: approx. 1,0 -2,0 N/mm2 -Wet: approx. 1,0 -2,0 N/mm2

In heat: approx. 1.0 -1.5 N /mm2 - In freeze-thaw cycles: approx. 1.0 -1.5 N/mm2

-In freeze-thaw cycles:

 approx. 1.0 -1.5 N /mm2

Suitable for underfloor heating: Yes.

Packaging: 25 kg bags.

Storage: Approx. 12 months in a dry place in its original closed packaging.

Product Details

Indoor and outdoor
Single component
Floor and wall
Normative UNE
UNE 12004 C2 F TT E S1
UNE 12004 - Type
C - Cementitious adhesive
UNE 12004 - Adherence
C2 - High adhesion
UNE 12004 - Drying time
F - Quick dry
UNE 12004 - Slipping
TT - Minimum slip
UNE 12004 - Open time
E - Long open time
UNE 12004 - Deformability
S1 - Deformable
Drying time
Marked CE
Quality certificate
ISO 9001 - LLoyds Register Quality Assurance Limited


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