• RM GM M20

    Article No. 064315

    RM GM M20

    Mineral stone substitution mortar for filling deep missing areas

    0643 | RM GM M20 | grey (intrinsic colour)
    Size / Quantity

    Product specifications

    Flexural tensile strength (28 days) Approx. 5 N/mm²
    Compressive strength (28 d) > 20 N/mm²
    E-modulus (DIN 1048) Approx. 18 kN/mm²
    Maximum grain size 2 mm
    Water requirement 3.25 - 4.15 l/25 kg

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

    Field of application

    • For use indoors and outdoors
    • Core construction underneath restoration mortars, in deep missing areas


    • Low free alkali content
    • Good flank adhesion
    • Low inherent stress
    • Preparation
      • Substrate requirements

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

      • Preparations

        Any necessary cleaning measures should be performed as gently as possible, e.g. by spraying with cold or hot water or steam cleaning; stubborn dirt should preferably be cleaned using the rotec soft blasting method or Remmers cleaning products (e.g. Clean FP, Clean AC basic, Clean WR).

        Preserve valuable heritage ornamental elements and statues by carefully removing encrusted dirt and using the appropriate Remmers Stone Strengthener to carry out repeated intensive strengthening.

    • Application
      • Application temperature: min. 5 °C max. 30 °C
      • Mortar cover / Filling knife / Trowel application
      • Apply a contact layer to the pre-wetted substrate using grout (dry mortar/water) in a layer thickness of approx. 2 mm.

        Apply mortar in layers from 1.5 cm to 3 cm thick into the contact layer while wet.

        Once the material has hardened sufficiently (when the grain "pops"), roughen the surface.

        Wait at least 24 hours before applying subsequent layers.

    • 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
      • Mortar cover / Filling knife / Trowel application
      • Mixing tool, trowel, smoothing trowel

        Clean tools with water while the material is still fresh.

    • Storage / shelf life
      • Protect form moisture
      • Shelf-life 12 months
      • If stored in an unopened container and in a dry place, the product will keep for approx. 12 months.

    • Usage
      • 1.8 kg / l void
      • Approx. 1.8 kg/l void

      • Apply to a large enough trial area to determine the precise amount required.

    • General information
      • 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.

        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.

    • 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.

    Possible system products