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highly flexible gel adhesive 2-15 mm (C2TE type)

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Product description

ATLAS GEOFLEX recipe contains an unique siliceous gel technology. The siliceous gel offers exceptional ability of water retention. It fills the pores formed at the stage of adhesive setting by the net of inorganic bindings. The accumulation of mixing water ensures full cement hydration, regardless the cladding type in use. Owing to the appropriate water management, which is necessary for the binding process completion, gel adhesive assures full adhesion to substrates of various absorptiveness level.

Main properties

  • no slip or full spreading beneath a tile
  • foot traffic and grouting just after 12 hours
  • for floating, thin- and thick-coat application
  • for difficult substrates, inc. concrete, terrazzo, old tiles and OSB

Main parameters

  • consumption: ca. 1.5 kg of dry mix / 1 m² / 1 mm adhesive layer
  • adhesive thickness: 2 - 15 mm
  • high bonding: ≥ 1 N/mm²


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The use of siliceous gel technology gives the advantages:
• possibility of fixing cladding of any type, both absorbable and non-absorbable,
• possibility of optimum adaptation of the adhesive consistency to individual contractor’s preferences and actual needs resulting from particular use, by dosing water within a range much wider than in case of traditional adhesives,
• full adhesive spreading beneath the tiles, which improves adhesion and bond durability, particularly in case of outdoor use,
• safe cladding fixing on substrates exposed to direct sunshine, both during tiling and the adhesive setting (e.g. on balconies, terraces, etc.).


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Wide range of adhesive thickness (2-15 mm) enables:
- thin-coat cladding fixing on even substrates,
- thin-coat cladding fixing on uneven substrates, preceded by substrate floating,
- thick-coat cladding fixing on uneven substrates, with no need of substrate floating.
No cladding slip – enables fixing the cladding “from the top” with no need of support at the fixing stage.
Foot traffic and grouting just after 12 hours – owing to accelerated adhesive setting and drying process.


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Fixing ceramic and stone cladding.

glazed tiles
porcelain-gres tiles
marble/ natural stone cladding insusceptible to discolouration
ceramic mosaic
glass mosaic *
glass tiles *
concrete/ cement tiles
laminated porcelain-gres tiles
composite panels
insulation and acoustic panels
*if in doubt conduct an application test.

 Fixing small, medium and large size claddings.

small and medium size tiles (< 0.1 m²)
large size tiles (< 0.25 m²)
very large size tiles (> 0.25 m²)
slim-type tiles

 Fixing the cladding on horizontal and vertical surfaces, indoors and outdoors.

public access, healthcare, offices
commercial and service
Industrial buildings and multi-storey garages
industrial warehouses
kitchen, bathroom, laundry, garage
terraces, balconies, loggia
showers, washes, rooms washed with plenty of water
communication routes
surfaces of small operational loads
façades (incl. ETICS systems)
surfaces of large operational loads
external stairs
technological tanks, pools, fountains, jacuzzi, balneotechnology (with no aggressive chemicals in use)
drinking water reservoirs
sauna, SPA

 Fixing the cladding on standard substrates.

cement screeds and mortars
anhydrite screeds
cement, cement-lime and gypsum plasters
walls made of cellular concrete
walls made of silicate brick or hollow blocks
walls made of ceramic brick or hollow blocks
walls made of gypsum blocks

 Fixing the cladding on deformable substrates or, so called, difficult substrates.

elastic and rigid damp proofing, e.g. WODER S, WODER E, WODER W or WODER DUO
magnesium substrates
dry substrates made of gypsum boards
screeds (cement and anhydrite) with water and electric heating system embedded
screeds with heating mats embedded in the adhesive
gypsum blocks
plasters with wall heating system
gypsum-fibre boards
cement-fibre boards
existing ceramic and stone cladding (“tile on tile”) [indoors only]
concrete resin lacquers bonded to the substrate
dispersion, oil paints bonded to the substrate
mineral, dispersion and reactive sealing coats
wooden floors (thick. >25 mm)
OSB/3 and OSB/4 and chipboards on floors (thick. >25 mm)
OSB/3 and OSB/4 and chipboards on walls (thick. >18 mm)
insulation and acoustic panels
metal and steel surfaces
plastic surfaces
mastic asphalt screeds

Floating standard and difficult substrates listed above.


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ATLAS GEOFLEX is manufactured as a dry mix of the highest quality cement binder, aggregates and specially selected modifying agents: natural and synthetic.

Mass bulk density (after mixing)
approx. 1.6 kg/dm³
Mixing ratio (water/dry mix)
0.26 – 0.33 l / 1 kg
6.5 - 8.25 l / 25 kg
Min./max. adhesive thickness
2 mm / 15 mm
Adhesive preparation temperature, substrate
and ambient temperature during work
from +5°C to +35°C
Maturing time
5 minutes
Pot life*
approx. 4 hours
Open time*
min. 30 minutes
Adjustability time*
20 minutes
Floor access/ grouting*
after 12 hours
Full operation load – foot traffic*
after 3 days
Full operation load – vehicle traffic*
after 14 days
Floor heating (warm surface)*
after 14 days
The time shown in the table is recommended for the application in the temperature 23°C and humidity 55% (approx.).



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The product conforms to PN-EN 12004 + A1:2012 standard for C2TE class adhesive. EC Declaration of Performance No. 186/CPR.

0767, 1614
PN-EN 12004 + A1:2012
(EN 12004:2007 + A1:2012)
Cement adhesive for tiles of enhanced parameters,
extended open time and reduced slip
C2TE type
for indoor and outdoor use,
for walls and floors
Reaction to fire – class
Bonding strength
- initial bonding
≥ 1.0 N/mm²
Durability - bonding after:
- heat exposure
- immersion in water
- freeze-thaw cycles
≥ 1.0 N/mm²
≥ 1.0 N/mm²
≥ 1.0 N/mm²
Open time - tensile adhesion after time not shorter than 30 minutes
≥ 0.5 N/mm²
≤ 0.5 mm
Release/content of hazardous substances
See: Safety Data Sheet
The product has been given the Radiation Hygiene Certificate.


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Substrate preparation
The substrate should be:
stable – sufficiently sound, resistant to deformation, free from materials which would impair adhesion, stabilized.
even – maximum adhesive thickness is 15 mm, in case of larger irregularities use, e.g. ATLAS ZW 330 mortar, screeds ATLAS SMS, SAM, POSTAR.
clean – free from layers which can impair adhesion, especially dust, dirt, lime, oils, greases, wax, residues of oil and emulsion paints. The substrate coated with algae, fungi, etc. must be cleaned and protected with ATLAS MYKOS agent.
primed with:
- ATLAS UNI-GRUNT or ATLAS UNI-GRUNT PLUS – substrates of excessive or heterogenous absorptiveness,
- ATLAS GRUNTO-PLAST – if the substrate absorptivity is low, or it is coated with layers limiting the adhesion.
Detailed guidelines concerning the substrate preparation, depending on its type.

Substrate type
Fresh cement screeds ATLAS POSTAR 80, ATLAS SMS 15 or ATLAS SMS 30
Stabilized min. 24 hours; optimum moisture content < 4% by weight.
Fresh cement screeds ATLAS POSTAR 20
Stabilized min. 5 days; optimum moisture content < 4% by weight.
Other cement screeds
Stabilized min. 28 days; optimum moisture content < 4% by weight. Prime with ATLAS UNI-GRUNT or ATLAS UNI-GRUNT PLUS.
Anhydrite screeds ATLAS SAM 55, ATLAS SAM 100, ATLAS SAM 150, ATLAS SAM 200 and ATLAS SAM 500
Stabilized min. 2-3 weeks; optimum moisture content < 0.5% by weight. Prime with ATLAS UNI-GRUNT or ATLAS UNI-GRUNT PLUS. If, white surface tarnish forms during drying, it should be removed mechanically (grinded) and the surface dusted. Screed grinding accelerates the drying time.
Cement and anhydrite screeds on floor heating
Appropriately heated and primed with ATLAS UNI-GRUNT or ATLAS UNI-GRUNT PLUS.
De-grease the surface thoroughly, in case of waxed terrazzo remove the top layer or whole layer and apply a new one.
Walls made of silicate or ceramic bricks and hollow blocks, cellular concrete
Leveling coat required (plaster). Direct fixing upon rough wall is possible in case of substrate appropriate dimensional tolerance. In such case it is necessary to execute full joint wall (or re-fill the joints) and repair any gaps or irregularities with ready-to-use mortars.
Cement and cement-lime plasters made of ready ATLAS mortars
Stabilized min. 3 days* for each 10 mm of thickness; optimum moisture content < 4% by weight.
Other cement and cement-lime plasters
Stabilized min. 7 days*. Prime with ATLAS UNI-GRUNT.
Gypsum plasters
Prime with ATLAS UNI-GRUNT. If the gypsum plaster is applied in a wet room it should be protected thoroughly against moisture. If damp has the form of short term action or average water splash, then the plaster should be coated with a preparation improving resistance against damp penetration, e.g. ATLAS GRUNTO-PLAST. In environment more subject to damp it is necessary to apply a watertight coating, e.g. ATLAS WODER E.
Stabilized min. 21 days; optimum moisture content < 4% by weight. Remove remains of formwork oils and other substances which would impair adhesion obligatorily. Holes, cracks and other gaps should be filled with ATLAS BETONER system mortars.
Oil paints and resin lacquers coatings
Coatings of poor bonding to the substrate should be mechanically removed. Stable, well bonded coatings: grind, dust; prime oil coatings with ATLAS GRUNTO-PLAST. Gypsum fillers which the substrate used to be evened with should be removed.
OSB boards and wooden floors – the layer composition should be designed and executed in the way excluding the possibility of deformation, which may lead to the cladding damage.
-    check the boards type, on floors one may use boards OSB/3 and OSB/4 (acc. to PN-EN 300:2007), min. 25 mm thick, on walls – min. 18 mm thick,
-    check the superstructure stability, the boards must not move under operation load; fix additional, stiffening boards layer, if needed,
-    matt the surface with 40-60 sand paper,
-    dust the surface,
-    in order to improve the board protection against moisture and improve the bonding, apply the liquid foil ATLAS WODER W or ATLAS WODER E, alternatively use priming mass ATLAS GRUNTO-PLAST in order to improve the bonding.
Existing ceramic or stone tiles (indoors only)
-    check the adhesion to the substrate of the existing cladding by tapping; individual loosening tiles must be removed,
-    clean and de-grease the existing tiles surface,
-    matt glazed tiles with a diamond grinder,
-    dust the surface,
-    prime with ATLAS GRUNTO-PLAST.
Insulation and acoustic panels
In case of panels with base coat reinforced with mesh, substrate preparation is not required.
*The time shown in the table is recommended for the application in the temperature 20°C and humidity 50% (approx.).

Adhesive preparation
Pour the adhesive from the bag into a container with the suitable amount of water (see Technical Data for ratio) and mix, using a low speed mixer with a drill for mortars, until homogenous. The dispersed adhesive should be left to rest for 5 minutes and then remixed. So prepared adhesive should be used up within approx. 4 hours.
Adhesive application
The adhesive should be applied onto the surface with a steel trowel and then distributed evenly and shaped (possibly in one direction) using a notched trowel. It is advisable to rub a thin adhesive coat first and then apply the thicker coat and shape it with a notched trowel. It is recommended to lead a notched trowel in one direction. On walls, it’s recommended to shape the adhesive in vertical direction.
Placing the tiles
After the application, the adhesive retains its properties for approx. 30 minutes (in temperature approx. 23 °C and 55 % humidity). Within this time, the tile must be placed and pressed well (the contact surface between the adhesive and the tile should be uniform and as large as possible – min. 2/3 of tile surface). Remove the excess of the adhesive pressed into the joints immediately. In case of floor tiles or tiling outdoors it is advisable to keep the full bonding surface (use the mixed method consisting in application of the adhesive on the substrate and tile bottom side, if needed). Keep the joint width appropriate for the tile size and operation conditions (check data in the sheets of ATLAS grouts).
Tile adjustment
The position of a tile can be adjusted with delicate moves along the bonding plane. It can be done within approximately 20 minutes since the tile is pressed (in temperature approx. 23 °C and 55 % humidity).
Grouting and cladding use
Foot traffic and grouting with ATLAS GROUT, ATLAS ARTIS GROUT, ATLAS DECORATIVE GROUT or ATLAS EPOXY GROUT can start after approx. 12 hours since the tiles fixing. The mortar reaches the operational strength after 3 days (check the Technical Data). Expansion joints, joints along the wall corners, at sanitary equipment, etc.
should be filled with sanitary silicone ATLAS SILTON S or ATLAS ARTIS.


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Average consumption: approx. 1.5 kg of dry mix / 1 m² / 1 mm adhesive layer – for complete filling the space beneath the tile. It depends on the smoothness of the surface and the back side of the tile.

Tile size
Trowel notch size
Thickness of
adhesive coat
2/3 surface contact
Full surface contact
mosaic up to 2 × 2 cm
from 2.0
from 3.0
small size
up to 10 × 10 cm
≥ 6.0
from 2.0
from 3.0
medium size
up to 30 × 30 cm
≥ 8.0
from 3.0
from 4.5
large size
from 30 × 30 cm
up to 50 x 50 cm
≥ 10.0
from 4.0
from 6.0


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• The adhesive spreadability beneath a tile is reached when using the upper mixing ratio, i.e. approx. 0.33 l with 1 kg of dry mix. No slip is reached when using the lowest mixing ratio, i.e. 0.26 l with 1 kg of dry mix.
• When fixing the tiles on terraces divide the screed with expansion joints into max. 3 m x 3 m technological areas. It is acceptable to increase the area surface up to 25 m2 on condition that contraction joints within the cladding are applied (recommended min. 4 cladding areas, each of 9 m2). Keep the 1:1 - 1:2 ratio between the area sides when planning the technological areas. The screed expansion joints should be transferred onto the cladding and filled with ATLAS ARTIS silicone. The contraction joints should be filled with ATLAS ARTIS silicone.
The minimum adhesive coat after pressing – 4 mm. The adhesive must fill the whole space beneath the tile.
• The time of technological breaks, product technical parameters, etc. refer to standard setting conditions, i.e. in temperature +23°C (+/- 2°C) and 55% humidity (+/- 5%), substrates defined in PN-EN 1323 standard and tiles in PN-EN 176 standard. In other thermal and humidity conditions the time indicated may vary.
• The tiles must not be soaked before fixing. When determining the adhesive thickness under the cladding, one should consider the geometric deviation of tiles shape, e.g. plane warpage. Tiles subject to discoulouration in contact with grey cement should be applied with the use of adhesives based on white cement binder.
• Open time – from the moment of application of the adhesive to the moment of placing the tiles upon it – is limited. In order to check if it is still possible to fix tiles, performing a test is recommended. It consists in pressing your fingers against the adhesive. If the adhesive remains on the fingers, you may fix the tiles. If the fingers are clean, the old layer of the adhesive has to be removed and a new one applied.
• The tools must be cleaned with clean water directly after use. Difficult to remove residues of the set adhesive can be removed with the ATLAS SZOP agent.
• Contains cement. May cause respiratory irritation. Causes skin irritation. Causes serious eye damage. May cause an allergic skin reaction. Keep out of reach of children. Avoid breathing dust. Wear protective gloves/protective clothing/ eye protection/face protection. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. If skin irritation or a rash occurs: Get medical advice/attention. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing. Follow the instructions of the Safety Data Sheet.
• The adhesive must be transported and stored in tightly sealed bags, in dry conditions (most preferably on pallets). Protect against humidity. Shelf life in conditions as specified is 12 months from the production date shown on the packaging. Content of soluble chromium (VI) in ready-to-use mix - ≤ 0.0002%.


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Foil bags: 25 kg
Pallet: 1,200 kg in 25 kg bags
The above information constitutes basic guidelines for the application of the product and does not release the user from the obligation of carrying out works according to engineering principles and OHS regulations.
At the time of publication of this product data sheet all previous ones become void.
Date of update: 2016-06-16
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highly flexible gel adhesive 2-15 mm (C2TE type)

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