Kiilto Flexfix
Flexible cementitious adhesive

A universal, non-sagging and flexible cementitious adhesive suitable for the laying of ceramic tiles. Long open time. Also for exterior applications. C2TES1. C2ES2 with Kiilto Fixbinder.

Special features

  • multi-purpose
  • ceramic tiles, decoration stones and stone
  • coverage 2–3 kg/m²
  • grouting 24–48 h
  • for interior and ecterior areas




Non-sagging, cementitious adhesive for setting tiles, clinker, light concrete and stones that are not moisture sensitive on vinyl, paint, tile, clinker and common aggregate surfaces as well as surfaces treated with Kiilto watertight membranes or Kiilto Kosteussulku moisture barrier, e.g., gypsum boards. Jointing can be done without a joint string. Suitable for interior and exterior use, but not for applications that are constantly under water (e.g., swimming pools).

The surfaces to be tiled must be clean and free from dust. Remove water-soluble smoothing and levelling compounds. Dry and absorbent surfaces must be moistened (excl. boards). Turn off floor heating approx. 24 hours prior to tiling. When tiling on vinyl, paint, tile and clinker substrates:

- ensure that the surface is solid and strong for tiling
- ensure that the surface to be tiled adheres properly to its own substrate
- remove wax, grease and dirt from the surface with Maalarinpesu cleaner and rinse well.
After the surface has dried, sand it, if necessary, and then remove the sanding dust.

Notching of trowel
Notching of trowel
Package Size EAN Code
5 kg 6411513520055
20 kg 6411513520208
Application temperature

Optimal +18–20 °C, minimum +5 °C

Bond strength

above 1.0 MPa EN 1348

Classifications and certificates

C2TES1 (EN12004), M1


approx. 3 kg/m² applied with a standard notched trowel (notching: 6mm x 6mm x 6mm) approx. 2 kg/m² when applied using a mosaic trowel (notching: 4 mm x 4 mm x 4 mm)


above 2.5 mm (EN12002)

Fire class


Frost resistance


Max. grain size

0.5 mm

Mixing ratio

5.5–6.0 l water / 20 kg bag

Open time

above 0.5 MPa / 30 min (EN1346)

Package sizes

5 kg plastic container, 20 kg bag


below 0.5 mm (EN1308)


Unopened package in a dry place 1 year

Substrate humidity

- concrete < 90 % RH


resin-cement-quartz-based powder

Working time

working time approx. 3–4 hours after adding water

Instructions for use

Strew powder slowly while stirring in cool, clean water until a smooth mass is formed. Let the mix mature for approx. 15-20 min. and then remix gently once. Apply the adhesive to the surface by pressing firmly and comb with a notched applicator an area that can be tiled within 10–15 minutes. Press the tiles firmly onto the surface and tap into position immediately. Adjustment time is 15 minutes. It is recommended to randomly lift tiles during the application to ensure sufficient coverage of tile backs (glazed tiles 70–75% and clinker 80–90%). When tiling outdoor areas, the coverage of tile backs must be 100 %. To make sure you get adequate coverage under the tiles, the trowel should be chosen according to the tile size and the tiling surface.

Remove fresh stains with water and a damp cloth. Dried mortar can only be removed by mechanical means.

Jointing with joint mortar and light loading can be done after 24 hours of tiling; with non-absorbent surfaces not until after 48 hours. We recommend Kiilto tile grouts for jointing the tiles.

Allow the tiling to dry for a week before proceeding to use as normal. Low temperature and high air humidity will retard the curing and drying process. Edges of panel and board walls, joints between wall and floor tiling and other movement joints should be jointed with Kiilto Saniteettisilikoni.

By using additive (see Kiilto Fixbinder instructions), adhesive's deformation properties can be improved (CE marking C2ES2).

Suitable for correcting minor irregularities on the substrate prior to tiling. For corrections of several millimetres, we recommend Kiilto wall plasters and floor levelling compounds.

Additional information

The information given in this product data sheet is based on our tests and our practical knowledge. The technical data is defined in standard conditions. Variations in local working conditions and methods will affect the product performance and result. We guarantee the high quality of our products according to our Quality Management System. No liability can be accepted from incorrect use of the product or prevailing conditions, over which we have no control. Thus, we cannot be held responsible for the final result. The correct use of the product presupposes that the user has made him/herself aware of the contents of the working instructions and procedure guide, if provided.

Environment and safety

Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Refer to material safety data sheet. For information on product and package disposal, go to