• Grout RZ

    Article No. 0568

    BSP RZ Historic

    Natural cement mortar

    Product specifications

    On delivery

    Compressive strength 7 days: > 1 N/mm²
    28 days: > 4 N/mm² (M 2.5)
    Dynamic E-modulus Approx. 9000 N/mm²
    Slump Approx. 26 cm
    Bulk density of fresh mortar Approx. 2.2 kg/dm³
    Maximum grain size 2 mm
    Air void content ≤ 5 %
    Water requirement Approx. 15%, equal to 3.75 l/25 kg
    Compressive strength class CS III

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

    Field of application

    • For use on floors/walls indoors and outdoors
    • Interior and exterior use
    • Mineral substrates in dry, damp, wet and underwater areas
    • Filling joints and voids in historic buildings


    • Historic binder from the 19th century
    • Good flow properties
    • Fast setting
    • Slow development of strength
    • Very good adhesion to the substrate
    • This natural cement has been produced to the same formulation for more than 150 years and is also called Roman cement. It is based on a lime-marl from the Cretaceous period traditionally fired in a shaft kiln at low temperature.
    • Preparation
      • Substrate requirements

        Clean, dust-free and capable of supporting a load.

      • Preparations

        Pre-wet the substrate so that it is slightly moist.

        Expose the grains close to the surface.

    • Application
      • Application temperature: min. 5 °C max. 30 °C
      • Curtain coating
      • Construct formwork if necessary.

        Pour continuously from one side or corner.

        Re-compact if necessary.

    • Application instructions
      • Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.

        Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.

    • Working tools / cleaning
      • Curtain coating
      • Mixer, universal funnel, quick-snap fastener

      • Clean tools with water while the material is still fresh.

    • Storage / shelf life
      • Protect form moisture
      • Shelf-life 6 months
      • Dry, in unopened containers, 6 months.

    • Usage
      • Approx 1.9 kg/l void
      • Approx. 1.9 kg/l void

    • General information
      • The mixing water must be of drinking water quality.

        May contain traces of pyrite (iron sulphide).

        Low chromate content in accordance with Directive 2003/53/EC.

        The characteristic data of the product were calculated under laboratory conditions at 20°C and 65% relative humidity.

        Deviations from applicable regulations must be agreed separately.

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

    • 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.

    • Safety / regulations
      • For further information on the safety aspects of transporting, storing and handling the product and on disposal and environmental matters, please see the current Safety Data Sheet.

    Deutsches Museum, München

    • Historically protected / historically valuable buildings
      Schools / universities / museums
    • München
    • 2010

    Die Fassade sollte saniert und erneuert werden. Vor der Hydrophobierung musste die Stabiliserung der Balkone erfolgen.

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