Product systems: Tile fitting

M 21 Classic Flexible Superior Adhesive C2 TE

M 21 Classic

BOTAMENT M 21 Classic is a flexible thin-bed adhesive for the fitting of almost all ceramic wall and floor coverings and natural stones which are non-sensitive to discolouration in interior and exterior areas. Due to the Air-flow-technology BOTAMENT M 21 Classic is particularly easy and smooth to handle.

  • Flexible
  • High stability
  • For heated areas
  • Suitable for tile on tile fitting
  • Long correction and open time
  • Suitable for swimming pools and potable water containers

Application areas

Bonding of:

  • vitreous stoneware and porcelain
  • non-vitreous stoneware
  • split tiles
  • floor clinker slabs and clinker tiles
  • hand-made tiles
  • small and medium-sized mosaics
  • natural stones which are non-sensitive to discolouration
  • insulation and lightweight building boards

Very smooth boards (e.g. rigid foam slabs) must be roughened up prior to bonding.

Suitable substrates
  • concrete, lightweight concrete, and porous concrete
  • joint full brickwork
  • plasters of the mortar categories CS II, CS III and CS IV in accordance with DIN EN 998 and gypsum plaster in accordance with DIN EN 13279 (compressive strength ≥ 2.5 N/mm²)
  • BOTAMENT building boards
  • old tiling
  • gypsum walls, gypsum cardboard and gypsum fibreboards
  • cement screeds and calcium sulphate screeds
Substrate preparation

The substrate must be in the following condition:

  • dry, clean and frost-free
  • stable
  • free from grease, paint, cement laitance, separating agents, sinter layers and loose particles

Absorbent substrates must be primed with BOTAMENT D 11.


cool and dry at least 12 months in its original sealed container

Mixing ratio

~ 8,0 l water/ 25 kg

Maturing time

5 minutes

Open time

~ 30 minutes

Processing time

~ 3 hours

Maximum layer thickness

5 mm


after ~ 24 hours

Can be grouted

after ~ 24 hours

  • mix up using cold, clean water while stirring with a slow rotating agitator until a homogenous, stiff and paste-like mass has formed

Application and substrate temperature

+ 5 °C to + 30 °C

Consumption or Usage

6 mm notched trowel ~ 2.4 kg/m²

8 mm notched trowel ~ 3.2 kg/m²

10 mm notched trowel ~ 3.8 kg/m²

Vital information

When installing ceramic coverings all existing standards and guidelines in their current versions must be observed.

Container Dispatch unit sold by the pallet Product number EAN Code
5 kg Paper sack light grey 4 units packed in foil 96 Units/s 49185000195609 4030905080230
25 kg Paper sack light grey - 40 Units/s 49185000375609 4030905080223
Application tips
Media Centre
Supplier search
Safety datasheets