• Funcosil BI

    Article No. 063905

    Funcosil BI

    Clear, hydrophobising impregnation for concrete

    Product specifications

    Appearance Clear, liquid
    Density (20°C) Approx. 0.78
    Flash point Approx. 40
    Runout time s in DIN 2 cup Approx. 44
    Active ingredient Silane/siloxane
    Active ingredient content, % by mass Approx. 20
    Carrier material Dearomatised hydrocarbons

    The stated values represent typical product characteristics and are not to be construed as binding product specifications.

    Field of application

    • For use outdoors
    • Protection of facades against driving rain
    • Concrete, exposed aggregate concrete, fibre cement
    • Protects against the ingress of de-icing salt
    • Protects against damage caused by frost and de-icing salt


    • Solvent-based
    • Improves resistance to frost and de-icing salts
    • Repels water
    • Enables water vapour diffusion
    • Good penetration capacity
    • UV-resistant
    • Alkali-resistant
    • Excellent long-term effect
    • Contains solvents
    • Preparation
      • Substrate requirements

        The substrate must be clean, dust-free and dry.

      • Preparations

        Any construction defects such as cracks, cracked joints, defective connections, rising damp and hygroscopic moisture must be remedied in advance.

        Perform any necessary cleaning gently, e.g. by spraying with cold or warm water or by steam-cleaning; use rotec soft whirl jet technology or Remmers cleaning products (e.g. Traffic Film Remover (0671), Clean FP (0666), Clean AC (0672), Combi WR (0675)) on tough stains.

    • Application
      • Application temperature: min. 10 °C max. 25 °C
      • By brush / Low pressure spraying
      • Apply the primer abundantly by flow coating without pressure (avoid misting), so that a 30 - 50 cm long liquid film flows down the surface.

        Apply on one section at a time, moving from top to bottom, and immediately go over with a large brush.

        Repeat the application several (at least two) times (wet on damp) until no further material is absorbed by the substrate.

        On surfaces where spray application is not possible, apply using a well-saturated brush.

    • Application instructions
      • Take appropriate measures to protect adjacent building elements and materials that should not come into contact with the product.

        Protect freshly treated surfaces from driving rain, wind, sunlight and condensation.

    • Working tools / cleaning
      • By brush / Low pressure spraying
      • Suitable tools are all solvent-resistant, low-pressure, conveying and spraying equipment and liquid pumps. For floors, a flat brush and paintbrush can also be used.

      • Tools must be clean and dry.

        After use and before prolonged interruptions of work clean tools with Thinner V 101.

    • Storage / shelf life
      • Store frost-free and cool / protect for moisture / close containers
      • Shelf-life 24 months
      • If stored unopened in its original container in a cool, dry place and protected against frost, the product will keep for at least 24 months.

        Use the contents of open containers as quickly as possible.

    • Usage
      • Total application/absorption rate 300 ml - 1000 ml Total / m²
      • Concrete: approx. 0.3 - 0.5 l/m²
        Lightweight concrete: approx. 1.0 l/m²
        Fibre reinforced cement: approx. 0.3 l/m²

      • Apply to a large enough trial surface (1-2 m²) to determine the precise amount of impregnation agent required.

    • General information
      • Current regulations and legal requirements must be taken into account and deviations from these must be agreed separately.

        The relevant test certificates must be observed when planning and carrying out work.

        Water must not be allowed to penetrate behind the hydrophobized zone.

        Not suitable for materials that are sensitive to solvents, such as polystyrene or bitumen.

        The level of absorption is crucial for the impregnation agent to work at its best. This depends on the respective pore volume and moisture content of the building material.

        Carry out a quantitative analysis of aggressive salts if there are any salts present that could damage building materials.

        High concentrations of harmful salts can cause major structural damage that impregnation cannot prevent.

        Testing effectiveness:

        The water absorption of mineral building materials can be determined using the Funcosil Test Tube developed by Professor Karsten (Funcosil Facade Testing Kit, article no. 4954).

        Testing can only be carried out at the earliest 6 weeks after application.

    • Disposal instructions
      • Larger quantities of leftover product should be disposed of in the original containers in accordance with the applicable regulations. Completely empty, clean containers should be recycled. Do not dispose of together with household waste. Do not allow to enter the sewage system. Do not empty into drains.

    Possible system products