Sopro’s No. 1 – 400 – Flexible Tile Adhesive

Sopro’s No. 1 Flexible Tile Adhesive is a highly deformable, cementitious, highly polymer-modified, S1-grade flexible tile adhesive, meeting C2 TE S1 requirements to DIN EN 12004, for wall and floor installation of ceramic tiles, discoloration-resistant natural stone units and terracotta; also for underwater applications, e.g. in swimming pools and process water containers. Suitable for use in conjunction with wall and floor heating, waterproof membranes and for stoneware, fully vitrified stoneware and earthenware. Very high coverage and excellent workability. Also for tile-on-tile applications. With 4-in-1 formulation for thin-, floating- and medium-bed application, and for filling smaller areas with max. 20 mm coat thickness. SMET has a wide range of tile adhesives – check them out.

For use with Earthenware, stoneware and fully vitrified stoneware tiles, mosaic, discoloration-resistant natural stone units, cast stone units. In residential, commercial and industrial facilities, bathrooms, catering kitchens, damp and wet spaces, swimming pools, on facades, balconies and patios. Suitable for filling and levelling smaller areas with max. 20 mm coat thickness (for drylining/dry construction and mastic asphalt screeds, max. 5 mm coat thickness).


Related Downloads

icon-pdf  TDS Sopro’s No. 1 Flexible Tile Adhesive

icon-pdf  EPD_ Sopro’s No. 1 _400_Flexible Tile Adhesive_Valid until 25.09.27


icon-pdf  TDS SMET_Tiling Onto Calcium Sulphate Floor Screed_System I

icon-pdf  SMET Professional Tiling Systems Brochure

Featured Benefits of Sopro’s No. 1 Flexible Tile Adhesive

  • For walls and floors, indoors and outdoors
  • C2: tensile adhesion strength ≥ 1.0 N/mm²
  • T: thixotropic – high sag resistance due to fibre reinforcement
  • E: extended open time > 30 minutes
  • S1: deformability ≥ 2.5 mm
  • 4-in-1 formulation: thin-bed, floating-bed and medium-bed laying; filler coats of up to 20 mm thickness
  • Excellent workability thanks to lightweight aggregate
  • Suitable for large-format units
  • Approved as system component for shipbuilding applications
  • System component of Sopro eScann® system
  • Low-chromate to Regulation (EC) No 1907/2006, Annex XVII
  • DGNB: Top quality level 4, Line 8, based on DGNB (German Sustainable
  • Building Council) criterion “ENV1.2 Local Environmental Impact” (2015 version).
  • For healthy living: Recommended by Sentinel Haus Institut


Coverage: Approx. 1.0 kg/m²/mm

Technical Details Sopro’s No. 1 Flexible Tile Adhesive

Mixing Ratio see TDS above
Coverage Approx. 1.0 kg/m² per mm coat thickness
Maturing Time 3 – 5 minutes
Modification Sopro’s No.1 flexible tile adhesive (order no. 400) can be modified by Sopro MEG 1567 megaFlex dispersion. Addition of min. 25% dispersion allows achievement of S2 rating to DIN EN 12004.
Open Time Approx. 30 mins
Suitable substrates Min. 3-month-old concrete, lightweight concrete, cement screeds, calcium sulphate (anhydrite and self-levelling anhydrite) screeds, mastic asphalt screeds (indoors), board subfloors, heated floor constructions (cement and calcium sulphate screeds), strong existing ceramic, natural stone, terrazzo or cast stone coverings, paperless gypsum panels, gypsum plasterboard and gypsum fibreboard, flush-jointed masonry (no composite masonry), renders made from masonry cement, cement render, lime/cement render, gypsum plaster and rigid foam board. As a basic requirement, all substrates shall be solid, strong and dimensionally stable. Specifications of DIN 18157 shall be observed. Waterproof membranes using Sopro FDF 525/527 flexible sealing compound, Sopro TDS 823 two-component turbo sealing slurry, Sopro DSF 523 one-component flexible sealing slurry, Sopro DSF 423 two-component flexible sealing slurry, Sopro DSF 623 flexible RS sealing slurry, Sopro PU-FD 1570/1571 surface sealant for walls/floors, Sopro ZR 618 Turbo MAXX reactive waterproof membrane (in preparation), Sopro AEB 640/Sopro AEB plus 639 waterproofing and separating membrane.
Loadable After approx. 3 days; in commercial facilities after approx. 14 days, in areas subject to high wet exposure after approx. 7 days, for underwater applications after approx. 21 days, in conjunction with wall and floor heating after approx. 14 days
Specified Times AApply for normal temperature range of +23 °C and 50 % relative humidity; higher temperatures shorten and lower temperatures lengthen these times.
Tool cleaning Wash tools with water immediately after use
Tools Mixing attachment, notched trowel with suitable serration (tooth size up to 12 mm).
Underwater and permanently underwater area Suitable
Storage Approx. 12 months, subject to storage on a pallet in dry, protected conditions in original unopened containers.

Available in 25kg & 5 kg bags

For other SMET grouts, and adhesives from SMET.