Rapid Hardening Floor Tile Bedding Mortar
ARDEX S 21 is ideal for fixing large floor tiles or brick pavers, and can also be used to form ramps and falls.
The BS EN 12004 C1 F designation for ARDEX S 21 classifies the adhesive as a “fast setting cementitious adhesive”. ARDEX S 21 is a special rapid hardening, pourable bedding mortar for floor tiles in internal and external locations. It is especially suitable for fixing large tiles, ceramic and brick pavers, terrazzo tiles and natural stones, etc.
Tiles bedded in ARDEX S 21 can be grouted and subjected to loads 3 hours after fixing at normal temperatures. It is particularly suitable for use in situations where the tiling has to be grouted and put into use shortly after bedding, or where low temperatures would unduly extend the
setting time of normal cement-based adhesives. ARDEX S 21 is a grey powder based on special cements, high quality synthetic resins and
fillers, which is mixed with water to produce an easily applied mortar with a working time of approximately 30 minutes. The mortar adheres strongly to cementitious bases such as concrete, cement/sand screeds etc.
ARDEX S 21 may also be used in conjunction with ARDEX E 90 to provide an elastic and water repellent mortar bed. The use of ARDEX E 90 admix is recommended when fixing large flat backed tiles and smooth backed, dense and fully vitrified ceramics, porcelain, vitreous mosaics etc. The inclusion of ARDEX E 90 will enable tiles to be fixed to concrete or cement/sand screeds with underfloor heating. For further advice on fixing tiles to underfloor heating systems, contact the heating system manufacturers or ARDEX Technical Services Department.
Unit Size Available: 22kg
Coverage: Approximately 4.1m2 at 3mm thick