Bona R540

As of 24 August 2023, adequate training is required before industrial or professional use of this product. Further information available at www.feica.eu/PUinfo or www.safeusediisocyanates.eu

Bona R540 is a multi-purpose primer / damp-proof membrane for both absorbent and non-absorbent subfloors. It can be used for damp-proofing concrete or cementitious subfloors with up to 4 CM% in humidity.

Suitable Substrates

• Cementitious screed (CT) according to EN 13813
• Calcium sulfate screed (CA) according to EN 13813 (only as a primer, not as a DPM)
• Mastic asphalt screed (AS) according to EN 13813
• Concrete floors
• Magnesia floors
• Floors levelled with levelling compounds (at least 2 mm thick)
• Chipboard (V100)

Bona Adhesives

Bona R540 is compatible with all Bona silane and polyurethane adhesives, including:

Product Use Bona R848 Adhesive An elastic, one-component, silane-based adhesive for installing engineered timber products or narrow solid boards Bona Quantum An elastic, one-component, silane-based adhesive for parquet flooring and most other types of timber products Bona Titan A hard-formulated, silane-based adhesive for all physically sound sub-floors

The substrate must be even, totally dry, clean, free from cracks and physically sound. The surface should also be slightly textured. If necessary, it should be professionally prepared for laying.

Always apply a small test area before beginning any project to assess consistency and compatibility of the product. Follow the manufacturer's instructions on the container at all times. Before use, the following climatic conditions must be met (values for Central Europe):

• Air temperature: min. 18°C
• Floor temperature: min. 15°C (with underfloor heating max. 20°C)
• R.H: max. 70%

The primer itself must, if necessary, be brought to the right temperature.

1. Apply the primer evenly to the substrate using a brush or roller
2. Avoid the formation of pools
3. Allow to dry to a transparent film
4. Occasionally, foaming can happen, due to high consumption
5. Can be used as a moisture barrier up to 4CM%, by applying a second layer of Bona R540 within 24 hours

Please see minimum drying time for the different adhesives in the table below:

• Bona R770/R777/R778: 1 hour
• Bona R845/R870T: 4 hours
• Bona R844/R848/R860/Bona Quantum/Bona Quantum-T: 24 hours

High relative air humidity and temperature will shorten the drying time; low air humidity and
temperature will lengthen the drying time. When in doubt a longer drying time is recommended.

Please note: Due to the formulation of this product, it is unlikely that any application rollers or brushes will be salvageable after use.

Consumption

• Primer: Approx. 100-150g/m2
• Damp proofing up to 4 CM%: Approx. 250-350g/m2