Interior and exterior bonding of ceramic and porcelain tiles and mosaics and natural stone materials that are not sensitive to moisture. Use Mapeker Rapid-Set Flex white for the installation of light coloured natural stone.
Spot bonding of insulating materials such as expanded polystyrene and polyurethane, gypsum board, glass and rock wool, wood-cement panels, formed-concrete blocks, sound-deadening panels etc.
Some application examples
Mapeker Rapid-Set Flex is a powder composed of a mixture of special cements, selectively-graded aggregates, synthetic resins and setting accelerators that develop high bond strength only 3 hours after setting.
For this reason floor and wall installations can be completed very quickly. Floors can be walked on after only 3 hours and are ready for general traffic after 24 hours.
Mapeker Rapid-Set Flex when hardened is frost-proof and water resistant.
Preparing the substrate
Mapeker Rapid-Set Flex can be applied to all stable substrates that are free of oils, grease, waxes and that are sound and free of loose plaster, laitance and crazing. Damp cement screeds can noticeably prolong the setting time of Mapeker Rapid-Set Flex.
Gypsum plasters must be perfectly dry (min. 4 weeks), sufficiently hard and free of dust. It is absolutely essential that they are treated with Primer G before applying Mapeker Rapid-Set Flex. In areas subject to extreme damp (showers etc.) Mapegum WPS should be used to waterproof the substrate.
Preparing the mix
Mapeker Rapid-Set Flex should be mixed with clean water and stirred continuously until it becomes a smooth lump-free paste. It is preferable to use a mechanical mixer. The mix must be used within 15-20 minutes, after which it begins to set.
A 20 kg bag of grey Mapeker Rapid-Set Flex should be mixed with about 4.6-5 litres of water (4.6-5 litres for the white version), and a 10-kg bag with about 2.3-2.5 litres of water. Allow the mix to stand for a few minutes then mix again briefly before applying.
Applying the mix
Mapeker Rapid-Set Flex is applied to the substrate with a notched trowel to a max
of 5 mm thick. When selecting the trowel, choose one that transfers the adhesive to at least 65% to 70% of the back of the tiles for interior dry walls and 100% coverage for floor areas, exterior and wet wall areas:
It is not necessary to wet the tiles before fixing; if, however, the backs are very dusty, they should be wiped over with a wet sponge. Mapeker Rapid-Set Flex’s open time in normal temperature and humidity is about 10 minutes; unfavourable weather conditions (strong sun, drying wind, high temperature), or a highly absorbent substrate will shorten this open time, sometimes to just a few minutes.
For this reason, there must be constant checks to see whether the adhesive has formed a surface skin or is still fresh to the touch.
Should a surface skin have formed, the adhesive should be removed and fresh adhesive applied. Do not wet the adhesive when it has formed a skin because, a non- adhesive film will be formed.
Adjustment of the tiles, if necessary, should be carried out within 5-10 minutes after placing the tiles. Tiling fixed with Mapeker Rapid-Set Flex must not be subjected to washout or rain for at least 3 hours and must be protected from frost and strong sun for at least 24 hours after laying.
Tile joints can be grouted 2-3 hours after application with MAPEI products (Keracolor and Ultracolor Plus).
If the joints need to have good chemical resistance or where hygiene is of importance, use Kerapoxy, a two-component acid-resistant epoxy grouting compound.
Expansion joints to should be filled with Mapesil AC, Mapesil LM or Mapeflex PU21.
Spot bonding to sound-deadening or insulating panels should be applied using a float or trowel, the trowel type and size to be determined by the flatness of the surface and the weight of the panels. In these cases, the open time must also be observed, bearing in mind that a few spots of adhesive on heavy panels may require temporary shoring which should then only be removed after the Mapeker Rapid-Set Flex has begun to set.
Tools and hands can be cleaned with water, tiled surfaces should be cleaned with a damp cloth; water should be used only in moderate quantities and after a few hours.
| Type: | powder |
| Colour: | dark grey and white |
| Bulk density (kg/m3): | 1,400 (grey) 1,400 (white) |
| Dry solids content (%): | 100 |
| Inflammability: | no |
| Mixing ratio: | Mapeker Rapid-Set Flex Grey and White 100 parts of powder with 23-25 parts by weight of water |
| Consistency of mix: | very viscous paste |
| Density of the mix (kg/m3): | 1,500 |
| pH of mix: | over 12 |
| Application temperature range: | from +5°C to +35°C |
| Pot life of mix: | 20 minutes |
| Open time: | 10 minutes |
| Adjustability time: | about 5-10 minutes |
| Ready for traffic on dry support: | 3 hours |
| Cure time on dry support: | 24 hours |
| Grouting on dry support: | 2-3 hours |
| Damp resistance: | excellent | |
| Ageing resistance: | excellent | |
| Resistance to solvents and oils: | excellent | |
| Resistance to acids and alkalis: | poor | |
| Resistance to temperature: | from –30°C to +90°C | |
| Flexibility: | moderate | |
| Bonding strength EN 1348 (N/mm2): | grey | white |
| – after 28 days +23°C - 50% R.H.: | 1.5 | 1.5 |
| – after heat ageing: | 1.3 | 1.3 |
| – after water immersion: | 1.0 | 1.0 |
| – after freeze-thaw cycles: | 1.2 | 1.2 |
| Brands |
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Synthetic resin primer in water dispersion with a very low content of volatile organic compounds (VOC).
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