PlaneMix S8 rapid

PlaneMix S8 rapid

Stand firm universal filler

  • For fine smoothing, repairs and filling of voids
  • For concrete, ceramic tiles, and timber floors
  • Charging of sand for thicknesses exceeding 3 mm
  • For interior use on wall and floor
  • No priming on cementious substrates
  • Easy to mix and apply
  • Fine consistency and good workability
  • Foot traffic after only 1 hour
  • Installation of floor coverings after 2 hours
  • Thickness: 0 - 8 mm

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Product facts


Grey, fast-setting, polymer modified powder on the basis of aluminous cement.

Applicable by straight steel trowel.




For smoothing/straightening: approx. 1.1 kg per m² /mm thickness.


Available in 5 kg and 20 kg PE lined paper bags.



Expected Result



Surface preparation

Fixing dowels





Alfix A/S H.C. Oersteds Vej 11-13 DK-6000 Kolding
Declaration of performance
No. 36
EN DS/EN 13813 CT-C30-F7

Alfix PlaneMix S8 Rapid
Cementitious screed
material for use interally
in buildings.

Reaction to fire A2fl-s1 Release of corrosive
Water permeability NPD Water vapour permeability NPD
Compressive strength C30 Flexural strength F7
Wear resistance NPD Sound insulation NPD
Sound absorption NPD Thermal resistance NPD
Chemical resistance NPD    

Tile fixing

Tile fixing



Technical data

Working temperature

+5°C - +25°C


1,9 kg/ltr. (oprørt med vand)

Working time

Aproxx 20 minutes at + +20°C
Aproxx 40 minutes at + +15°C

Foot trafic

after 1 hours at +20°C

Floor covering

After 2 hours at +20°C

Full strength

After 7 days at +20°C

Compression strength

20 - 30 N/mm²

Tensile bending strength

7 - 9 N/mm²

Shelf life

Min. 6 months in unopened bag

How to use


Concrete subfloors, max humidity 95% RH.

Gypsum plaster, ceramic tiles, terrazzo, and timber floors.

For further information and details, please contact our Technical Services Dept.

Surface preparation

The surface should be dimensionally stable, sound, clean and free from dust and laitance. Residues from grease or soap can be removed with Alfix Deep Cleaner. To remove laitance or roughen smooth surfaces, use mechanical preparation, such as sanding or grinding, and vacuum subsequently. Cementious substrates are now ready to receive PlaneMix S8 Rapid. Other substrates should be primed with Alfix PlaneMixPrimer. Use primer in accordance with type of substrate.
Ensure a room temperature of min. +10°C while working. Allow primer to dry before commencing further treatment.

How to use

Add 0.28 litres of clean cold water per kg powder.
Pour water into a clean container and sprinkle in powder while stirring continuously. Mix until a lump-free and smooth consistency is obtained.
Alfix PlaneMix S8 Rapid offers easy application and good workability when using straight steel trowel. Working time is approx. 20 minutes at +20°C. As soon as the mortar starts to set, it can be formed, smoothened, and finished up with float, sponge or felt slightly wet.
Alfix PlaneMix S8 Rapid can be used for thicknesses up to 8 mm. For thicknesses exceeding 3 mm, up to 50% kiln dried sand can be added. Should grinding or sanding be required, allow 2 – 24 hours after application.

Exposure to chair castors, min. thickness: 1.5 mm NB!
Do not mix larger quantities than can be applied within the working time stated. Additional water should not be added to repair mortar already starting to set.
Note that the temperature of mixing water will influence working time/pot life.
Over dosage of water will reduce strength and may produce laitance. Protect from draughts, direct sunlight, and heat.
Wet room usage requires installation of tanking system.
Close broken packaging carefully after use and use the rest within the shortest possible time.


Tools and tiles should be cleaned with water before the repair mortar sets.
Cement-based products harden when mixed with water, hence do not pour surplus PlaneMix into the drain system.

January 2021

Happy New Year! Team Alfix is back from Christmas holidays and ready to serve our good Scandinavian customers.

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