High performance two-component polyurethane adhesive for ceramic tiles and stone material.
Keralastic T is an improved (2) reaction adhesive (R) and slip resistant (T) classified as R2T.

Where to Use

Indoor and outdoor, bonding of wall and floor ceramic tiles, stone material, mosaics, etc. on:

• screeds,
• renders,
• concrete,
• asphalt,
• wood,
• metal,
• PVC,
• reinforced polyester,
• fibre-cement,
• gypsum,
• gypsum board,
• gypsum panels, etc.

Application Examples

• Bonding ceramic tiles, stone material and all types of mosaics 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 MAPEI standards).
• Bonding ceramic tiles and stone material on surfaces subject to vibrations and deflections.

Technical Characteristics

Keralastic T is a two-component, solvent and water free adhesive which is flexible and
waterproof. It is made up of a polyurethane base (component A) and a special hardener (component B).
On mixing the two components together, the result is a paste with the following properties:

• good workability;
• excellent durability and resistant to ageing;
• perfect adhesion to all surfaces used in building;
• hardens by chemical reaction without shrinkage (until it becomes highly resistant);
• high deformability;
• in the case of Keralastic T, highly thixotropic: it can be applied vertically without slump and without letting even heavy or large tiles slip. The slipping strength is in compliance with EN 1308.

Recommendations

• 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 temperatures between +10°C and +30°C.
• In case of use on surfaces subject to continuous immersion in water, consult the MAPEI Technical Services
  Department beforehand.
• Do not use Keralastic and Keralastic T to bond transparent glass materials.
• We advise against using these products on particulary porous or light coloured natural stones to bond such
  materials, use Ultrabond Eco PU 2K.

Application Procedure

REFER TO TECHNICAL DATA SHEET PDF (See Specifications – Below)

Tile Installation

Tiles must be absolutely dry.

Apply firm pressure to the tiles to ensure good contact and covering of the back.

If the layer of fresh Keralastic T is also to act as a waterproofing membrane, make sure that any ribs and lugs do not go through the layer.

If Keralastic T is used for installing onto particularly deformable substrates, all coverings larger than 5×5 cm must be installed with wide joints.

The open time of Keralastic T under normal temperature and humidity conditions is approximately 50 minutes.

Any adjustment must be carried out within 90 minutes from installation.

The setting time is strictly tied to the ambient temperature (see table below).

Setting time of Keralastic T in relation to the temperature:

Temperature
(°C) 30 25 20 15 10
Time (hours) 2 3 6 8 20

Grouting and Sealing

Joints between the tiles can be grouted after 12 hours with the appropriate MAPEI cementitious or epoxy grouts, available in a variety of different colours.
Expansion joints must be sealed with the special MAPEI sealants.

Set to Light Foot Traffic

Floors are set to light foot traffic after approx. 12 hours.

Ready for Use

Surfaces are ready for use after approx. 7 days.

Cleaning

Tools, buckets and clothes can be easily cleaned with alcohol before hardening sets in.
Hardened Keralastic T can be cleaned mechanically or with Pulicol 2000.

Consumption

Bonding of ceramics and stone material:

• Mosaics and small size tiles (trowel No. 4): 2.5 kg/m²
• Normal size tiles (trowel No. 5): 3.5 kg/m²
• Large size tiles, marble, stones (back buttering): 5 kg/m²

Packaging

Keralastic T are available in double metal drums of

• 10 kg (9.4 kg/m² component A + 0.6 kg/m² component B);
• 5 kg (4.7 kg/m² component A + 0.3 kg/m² component B).

Storage

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

Safety Instructions

Keralastic T component A is an irritant for eyes and skin, both components A and B may cause
sensitisation if they come into contact with the skin of those predisposed.

Keralastic T component B is corrosive, may cause serious burns and is harmful if swallowed.

During use wear protective gloves and goggles and take the usual precautions for handling of chemicals.

If the product comes in contact with the eyes or skin wash immediately with plenty of water and seek medical
attention.

Furthermore, Keralastic T component A is hazardous for aquatic life.

Do not dispose of these products in the environment.

For further and complete information about the safe use of our product please refer to the latest version of our
Material Safety Data Sheet.

PRODUCT FOR PROFESSIONAL USE