Mapei Mapefloor CPU / MF

Mapei Mapefloor CPU / MF is a three-component, self-levelling, polyurethane/cement-based mortar for coating industrial floors in layers from 3 to 6 mm thick. Complies with standards applied in the foodstuffs sector.

Best Uses

Mapefloor CPU/MF is a three-component polyurethane/cement-based formulate used to create protective coatings on industrial floors subjected to medium to heavy traffic and high chemical aggression, for dry and wet processing areas. 

Some application examples:

• Coating floors in the chemical and pharmaceutical industries
• Coating floors in the foodstuffs industry
• Coating floors in wineries, breweries and beverage industry in general

Mapefloor CPU/MF is a three-component formulate made from cement, selected aggregates and polyurethane resin according to a formula developed in the MAPEI research laboratories. Mapefloor CPU/MF complies with standards applied in the foodstuffs sector EN 1186, EN 13130 and prCEN/TS 14234, as well as the Decree Of Consumer Goods that represent the conversion of European directive 89/109/EEC, 90/128/EEC and 2002/72/EC regarding contact with foodstuffs.

Mapefloor CPU/MF is used to create seamless coatings from 3 to 6 mm thick, smooth or with a non-slip finish (Mapefloor System CPU/DP), characterised by high resistance to chemicals such as acids, alkalis, oils, grease, saline solutions, hydrocarbons, etc. A 6 mm thick coat of Mapefloor CPU/MF has excellent resistance to thermal shocks of up to +70°C, such as when cleaning with hot water is carried out. The in-service temperature for a coating of Mapefloor CPU/MF with a thickness of at least 3 mm varies from -20°C to +70°C. Thanks to its high mechanical strength and resistance to abrasion, Mapefloor CPU/MF is suitable for floors subjected to medium to heavy traffic, depending on the applied thickness. Coatings made from Mapefloor CPU/MF are easy to clean.

COLOURS
Mapefloor CPU/MF is a neutral colour and must be pigmented on site at the moment it is applied by adding Mapecolor CPU which is available in grey, beige, oxide red, green and ochre yellow.

Application

Characteristics of the substrate
The cementitious screed must be solid, compact, stable, strong, sound and clean and dimensioned according to the static and dynamic design loads it will have to withstand while in service. The flatness must be defined according to its intended use. The compressive strength of the concrete or cementitious mortar must be at least 25 N/mm² and its tensile strength must be at least 1.5 N/mm². If the substrate is dressed with ceramic, natural stone or an old resin coating, they must be perfectly stable, firmly bonded to the substrate and must be intact, sound and clean. These kinds of substrates require specific and adequate preparation.

In the case of old resin coatings, it is also recommended to test their compatibility with the new system to be applied. The substrate must be dry or slightly damp. There must be no capillary rising damp (test with a sheet of polythene). In case of new concrete slabs, wait at least 10 days after the concrete casting before the application of the product.

Preparation of the substrate
It is very important that the surface is prepared correctly to guarantee perfect adhesion and the best performance of the product. The most suitable methods to prepare the surface are those of mechanic nature, such as shot-blasting or grinding with a diamond disk. Bush-hammering or scarifying are only required if several millimetres of material need to be removed from the surface. After that, all scraps must be removed carefully, and the dust must be removed with a vacuum cleaner. Once the surface of the substrate has been prepared, it must be sound, compact, clean, dry, or slightly damp, absorbent and have a slightly rough finish and have no traces of material that could affect adhesion of the coating, such as:

• Cement laitance
• Dust, loose or detached parts
• Protective waxes, curing products, paraffins, efflorescence
• Pollutants of any nature
• Loose residues of existing coating etc

If required, contact MAPEI Technical Services for advice on the most suitable preparation method. Any defects present in the surface, such as holes, pitting, cracking, etc., must be repaired with Primer SN fillerized with quartz sand or made thixotropic with Additix PE or Mapefloor JA depending on the width and depth of the defects or cracks. To repair highly deteriorated areas and joints, fill large hollows and to create or slightly modify the slope in confined areas, use Mapefloor EP19, pre-dosed, three-component epoxy mortar or Mapefloor CPU/MF. If the substrate needs to be strengthen, apply Primer MF with a roller in one or more coats until the substrate is completely saturated.

Make a series of anchoring grooves for the product around the edge of the area to be coated and in around all vertical features such as walls, pillars, cable trays, drains, etc. Grooves must also be created if there are interruptions in the coating, such as joints between when work finishes for the day and then when starting work again. The width and depth of the grooves must be around twice the thickness of the Mapefloor CPU/MF coating to be applied.

Preliminary checks before application
The surrounding temperature and that of the floor and of the product must be higher than +8°C and max. +35°C (the ideal application temperature is +15°C to +25°C). The temperature of the substrate must at least 3°C higher than the dewpoint temperature. The relative humidity of the air must be max. 80%.

Description of the systems
Mapefloor CPU/MF may be applied both as smooth self-levelling coating or multi-layered coating with rough non-slip finishing (Mapefloor System CPU/DP). For further information regarding Mapefloor System CPU/DP, multi-layered anti-slip coating with a thickness from 3 to 4 mm, see the relevant System Technical Data Sheet.

SELF-LEVELLING SMOOTH COATING WITH THICKNESS FROM 3 TO 6mm

Application of primer
When creating self-levelling smooth coatings, before applying Mapefloor CPU/MF, always treat the surface with a coat of primer to saturate the porosity of the substrate. Perform the following steps: for dry, cured substrates with a moisture level of < 4%, and when thermal shocks will not be expected on the coating when in service, use Primer SN mixed with 20-30% by weight of Quartz 0.5. The mix must be poured onto the surface of the clean, de-dusted floor, spread over the floor with a straight, steel trowel and skimmed down to a feather edge. Immediately after applying the coating, fully broadcast the surface with Quartz 0.9. Once the primer has set, remove any excess quartz, sand the surface and remove all traces of dust with a vacuum cleaner. Then apply the Mapefloor CPU/MF.

Please refer to the Primer SN Technical Data Sheet for further information on its use and application. As an alternative to Primer SN, for all suitable types of substrate, particularly moist substrates or substrates with thermal shocks expected on them when in service, apply a coat of Mapefloor CPU/MF skimmed down to a feather edge. The product must be completely hardened and no longer sticky before applying the final coat of Mapefloor CPU/MF as a self levelling layer. Wait at least 12 hours at +20°C, depending on actual site conditions.

Preparation of the product
Mix component A and then pour it into a clean and properly dimensioned container. Add component B and mix it with a suitable low speed electric mixer to form a smooth, even paste. Then add Mapecolor CPU powder colouring agent slowly and gradually (one 5 kg bag of Mapecolor CPU for every kit of Mapefloor CPU/MF A+B+C). Mix again for a few seconds until a homogeneous mix is obtained. Add, slowly and gradually, all component C while continuing mixing until a homogeneous mix is obtained. We recommend a specific low speed mortar mixer for this operation, such as a vertical mixing axis or a mixer with static blades and a rotating mixing drum. Apply the mix within the pot life indicated on the Product Data Sheet. Higher surrounding temperatures will reduce the pot life of the mix, while lower temperatures will increase its pot life.

Application of the product
Pour Mapefloor CPU/MF onto the floor and spread it out evenly to the thickness required, from 3 to 6 mm, with a straight or notched trowel or a pin-rake. Immediately after applying Mapefloor CPU/MF, backroll intensively with a spiked-roller to remove entrapped air and reach an even surface.