Sopro VF HF 420 - VarioFlex® High Strength Flexible Tile Adhesive

An extra-rapid-set, early-high-strength, flexible, cementitious floating-bed tile adhesive allowing early loading, for efficient tile laying and is particularly suitable for dishing-prone resin-bonded tiles using a thin-bed method. Low-chromate to Regulation (EC) No 1907/2006, Annex XVII. Tested to C2 EF, DIN EN 12004.

Features and benefits:

• Extra-rapid-set.

• Early high strength, achieving tensile adhesion strengths ≥ 1.0 N/mm² after only 3 hours.

• Rapid crystalline water binding.

• High reliability through full rear-face wetting and contact adhesion.

• Ideal for fast-track or tightly scheduled schemes.

• Floating-bed floor laying, indoors and outdoors.

• With the addition of 30 % Sopro QS 511 coarse silica sand, Sopro VF HF 420 is also suitable for 5–20 mm coat thicknesses.

• Reduced dust.

• EMICODE system of GEV (German Association for Control of Emissions in Products for Flooring Installation): EC1PLUS R ('very-low-emission-plus') rating.

• DGNB (German Sustainable Building Council): Top quality level 4.

• CE marked.

Applications:

For dishing-prone resin-bonded tiles, cast stone and terrazzo tiles, earthenware, stoneware and fully vitrified stoneware tiles, mosaic, terracotta, discoloration-resistant natural stone units in marble, granite, etc. Also suitable as bonding and contact layer in conjunction with thick-bed method, e.g. for rapid-set mortars incorporating Sopro Rapidur® B1 turbo binder. Suitable for commercial and industrial facilities, hospitals, public buildings, airports and railway stations.

Sopro VF HF 420 ensures full rear-face wetting of tiles, exceptionally high frost resistance for covering system and uniform load transmission to substrate. Suitable for trouble-free laying of large-format fully vitrified stoneware tiles up to 1 m² in size on calcium sulfate screeds pre-treated with undiluted Sopro GD 749 primer. For larger formats, calcium sulfate screeds should be pre-treated with Sopro MGR 637 multi-purpose primer or Sopro EPG 522 epoxy primer.

Suitable substrates:

Minimum 3-month-old concrete, calcium sulfate screeds, mastic asphalt screeds (indoors), board subfloors, cement screeds, heated floor constructions (cement and calcium sulfate screeds), strong existing ceramic, natural stone, terrazzo or cast stone coverings, timber substrates (in conjunction with Sopro FDP 558 tile insulation board) and waterproof membranes.