Koster SL FLEX - Self-Leveling Underlayment (Wood & Tile) - 50 lb Bag - SL 284 025

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Flexible self-levelling underlayment for wood, and tiled substrates.

Key Features

  • Excellent bonding characteristics on various surfaces: wood, tile, steel, concrete, screed.
  • Early loadable mineral based underlayment for tiled surfaces.
  • High flexibility: accommodates movement in the wooden substrate as well as high point loads.
  • Stabilizes the surface due to its high flexural strength.
  • Resistant to foot traffic after approx. 4 hours (depending on temperature)
  • Can be tiled over after approx. 6 hours (depending on temperature)
  • Application of parquet, carpet, synthetic flooring after 48 – 72 hours (depending on temperature)
  • Low viscosity and self-levelling during its pot life.
  • Can be applied in layer thicknesses between 2 and 15 mm, in depressions up to 30 mm
  • Hardens quickly and tension free.
  • Easy to install.
  • Pump- and pourable.
  • Ideal for changes in use and renovations.

Technical Data

Pot life (DIN EN 16945 approx. 20 min. (+ 20 °C)
Application temperature + 5 °C to + 30 °C
Bulk density (powder) approx. 1.3 g / cm³
Initial set > 60 min
Final set < 120 min.
Compressive strength (28 days) approx. 30 N / mm²
Bending tensile strength (28 days) approx. 10 N / mm²
Tensile strength (depending on substrate) up to 3 N / mm²
Resistant to foot traffic after approx. 4 hours*
Can be tiled over after approx. 6 hours*
Application of Parquet, Carpet, synthetic flooring after 48–72 hours*
Water requirement 5.2 l per bag
Layer thickness 2 mm bis 15 mm
Layer thickness in depressions up to 30 mm
Layer thickness on smooth surfaces up to 15 mm
Consumption approx. 1.6 kg Powder / m² / mm layer thickness
*depending on temperature