CX MT HARDTOP 331 is a one part, pre-blendede,coloured metallic dry shake hardener for
concrete comprising of cement, hard metallic non corroding aggregates, special admixtures and

Uses: CX MT HARDTOP 331 provides a non-staining, ultrahard wearing, metallic dry shake topping for monolithic floors. When sprinkled and trowelled into fresh wet concrete floors, it forms a coloured, extremely wear resistant smooth and dense surface

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Highest wear resistance rating


Dust proof

Dust proof


Impact of Resistance

Excellent impact resistance


Cost effective

Cost effective, long life floor Maintenance free. Regular cleaning is simply all that is required.

Mechanical Properties
Appearance / Colours : Powder
Natural (concrete grey)
Other colours upon request
Chemical Base : Natural mineral aggregates graded and mixed with cement, admixtures and pigments
Bulk Density : ~ 1.5 ± 0.1 kg/l at 27ºC
Abrasion Resistance:~1.70 mm thickness loss (average )
Consumption: For Light duty 3.5 to 4.0 kg/m2
For Medium duty 4.5 to 5.0 kg/m2
For Heavy duty 5.5 to 6.0 kg/m2
Substrate Temperature : +5°C min. / +35°C max
Ambient Temperature: +5°C min. / +35°C max 
Relative Air Humidity: 30% r.h. min. / 98% r.h. max
Compressive Strength : 90 N/mm2 (when tested as per BS 1881, Part 116, 1983)
  • Application of CX MT HARDTOP 331 must not be carried out in strong wind or draughts.
  • Do not use concrete where some cement has been replaced by fly ash, as this makes the mix sticky and less workable.
  • Variations in concrete characteristics such as water content and cement quality may lead to slight colour variations.
  • Dry shake hardeners give a finish to concrete with some colour variation across the floor due to the natural variability of the concrete onto which they are applied.
  • To ensure optimum colour consistency, it is essential that the floor laying operation is as clean and protected from the environment as possible.
  • Colour variation during the drying out period is normal for this system and is to be expected.
  • Every effort must be made to ensure an even application of CX MT HARDTOP 331. Correct timing and trowelling techniques are essential.
  • At low relative humidity (below 40 %), efflorescence can appear on the surface.
  • At high relative humidity (above 80 %), bleeding, slower curing and hardening can occur and extended finishing operations be required.
  • Shrinking joints are to be created within two days. Expansion joints are reflected in the surface of the floor.
  • The concrete deliveries must be of consistent quality and comply with local standards. A concrete slump in the range 75 to 110 mm will normally give best results (a slump of up to 150mm is possible with careful mix design).
  • The slab must be of good quality concrete with a minimum water/cement ratio consistent with the production of a fully compacted slab. The compressive strength must be a minimum of 25 N/mm2.
  • Use of CX SUPERCONCRETE 750 P+ super plasticisers is advised to ensure the optimum quality of concrete and where fibres are used, their optimum dispersion within the mix. Air Entrained Concrete is not a suitable substrate for the application of dry shake hardeners.
  • For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet (SDS) containing physical, ecological, toxicological and other safety-related data.
Chemax Metallic Application