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Adhesives & Bonding Agent

Ultra Flex

Two-Component, High -Performance, Polyurethane Adhesive
For Ceramic Tiles and Stone Material

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Dubond Ultra Flex is two-component solvent and water free adhesives which are flexible and waterproof. They are made up of a polyurethane base (component A) and a special hardener (component B).

Dubond Ultra Flex is an improved (2) reaction resin adhesive (R) and slip resistant (T) classified as R2T.

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Areas of Application

Fixing wall and floor tiles indoors and outdoors. The tiles can be made of: Ceramic, stone material and mosaic.

Fixing on screeds, renders, concrete, asphalt, wood, metal, PVC, reinforced polyester, asbestos -cement, gypsum, gypsum board, gypsum panels etc

Bonding ceramic tiles, stone material and all types of mosaic in showers and on sheets used for prefabricated bathrooms

Bonding ceramic tiles and mosaics on wooden work surfaces or in kitchens in order to achieve a waterproof substrate

Bonding ceramic tiles, stone material and mosaics on balconies, external terraces domes or flat roofs subject to foot traffic

Bonding natural stones and reconstructed stone (marble of every type, slate etc.) also subject to movement and size variation due to the absorption of water (class C of size stability according to DUBOND standards)

Bonding ceramic tiles and stone material on surfaces subject to vibration and deflection

Features and Benefits

Easy workability

Excellent durability and resistant to ageing

Perfect adhesion on all surfaces used in building

Hardens by chemical reaction without shrinkage (until it becomes highly resistant)

High deformability

In the case of Ultraflex, highly thixotropic: it can be applied vertically without slump and without le tting even heavy or large tiles slip

Typical Properties

Preparation of Substrates

  • The substrate must be cured, mechanically strong, free of loose particles, grease, oil, paint , wax and be sufficiently dry
  • Cement substrate 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 centimeter of thickness and cementitious screeds must be cured for at least 28days , unless they have been made with DUBOND special binders for screeds such as DUCEM, DU GO SL. Where this not observed, the adhesion of Ultraflex to the substrate will be greatly compromised
  • Rust on iron surfaces must be removed by sandblasting. It is recommended to reinforce gypsum, gypsum board and anhydrite substrates with a coat of Primer

Preparation of the Adhesive:

Apply to the substrate a uniform layer of Ultraflex with a notched trowel. Choose a trowel that will give coverage to the back of the tiles of at least 65 -70% (see “consumption”). For exterior installations, the tile backs must be completely covered with the adhesive. When both waterproofing and bonding are required, for example on wooden kitchen worktops, one of two procedures may be followed:

  • Spread Ultraflex on the substrate with a flat trowel to a thickness of at least 2mm; then rework the surface with a notched trowel so as to line it all over, but without reducing the thickness to less than 1mm. Thickness must be maintained even after the tiles have been installed, especially when the tile backs have high lugs or ribs
  • Spread Ultraflex with a flat trowel to a uniform thickness of 1mm for waterproofing and, after hardening (in any case within 24 hours), apply a second layer of Ultraflex with a notch trowel


  • Tiles must be absolutely dry
  • Apply firm pressure to the ?les to ensure good contact and covering of the back. If the layer of fresh Ultraflex is also to act as a waterproofing membrane, make sure that any ribs and lugs do not go through the layer
  • If Ultraflex is used for installing on particularly deformable substrates, all coverings larger than 5x5 cm must be installed with wide joints
  • The open time of Ultraflex under normal temperature and moisture conditions is approximately 50 minutes. Any adjustment must be carried out within 90 minutes of installation

Technical Information

Product Identity

Colours  White & Grey
Mixing Ratio        5kg [Part A (thick paste) 4.7kg : Part B (fuid liquid) 0.3kg]  10kg [Part A (thick paste)    9.4kg: Part B (fuid liquid) 0.6kg]
Density (gm/cm³)        Part A (1.56) & Part B (0.93)
Dry Solids content (%)    Part A (97) & Part B (100)

Application Data

Pot life 30-40 minutes
Open time 50 minutes
Adjustability time 90 minutes
Application temperature range from +10°C to +30°C
Setting time :
-initial 6 hours
-final 8 hours
Set to light foot traffic 12 hours
Grouting 12 hours
Ready for use 7 days
Density of mix. (Kg/m³) 1520

Final Performances

Shear adhesion strength (N/mm²): -
-Initial shear adhesion strength 2.6
-Shear adhesion strength after immersion 2.0
-Shear adhesion strength after thermal shock 2.4
Resistance to ageing High
Resistance to solvents & oils Good
Resistance to acids & alkalis Good
Resistance to temperature from  -40˚C to 100˚C
Deformability Highly deformable

Other Information

Precautions & Limitation

  • Do not use on very damp surfaces or where there is a risk of rising damp
  • The packs are pre-measured, therefore mixing errors are impossible. Do not use partial quantities. A wrong mixing ratio could cause damage during the curing process
  • Use the products in temperature between +10 C to +30 C
  • In case of use on surfaces subject to continuous immersion in water, consult the DUBOND Technical Services Department beforehand
  • Do not use Ultraflex to bond transparent glass material


Mosaic & small size tiles (trowel no. 4) 2.5kg/m²

Normal size tiles (trowel no. 5) 3.5kg/m²

Large size tiles, marble, stones (back buttering) 5 kg/m


5kg & 10kg

Shelf Life & Storagee

Ultraflex are stable for at least 24 months when stored in sealed drums. Component B (hardener) must be stored in warm place to avoid crystallization during cold weather (at least at +10°C). Should crystallization occur, re-dissolve by warming before use. Stir the product before use.

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